Meyer Sound Speaker M3D SUB User Manual

M SERIES

QUICKFLY RIGGING MANUAL

M3D™ and M3D-Sub

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SYMBOLS USED

These symbols indicate important safety or operating features in this booklet and on the chassis.

Dangerous voltages: risk of

electric shock

Important operating

instructions

Frame or chassis

Masse, châssis

Protective earth ground

Terre de protection

Pour indiquer les risques

résultant de tensions

dangereuses

Pour indequer important

instructions

Zu die gefahren von

gefährliche spanning zeigen

Zu wichtige betriebs-

anweisung und unter-

haltsanweisung zeigen

Rahmen oder chassis

Armadura o chassis

Die schutzerde

Para indicar voltajes

peligrosos.

Instrucciones importantes

de funcionamiento y/o

manteniento

Tierra proteccionista

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

11. Only use attachments/accessories speciﬁed by Meyer

Sound.

12. Use only with the caster rails or rigging speciﬁed by

Meyer Sound, or sold with the loudspeaker. Handles

are for carrying only.

4. Follow all instructions.

5. Do not use this loudspeaker near water.

6. Clean only with dry cloth.

CAUTION: Rigging should only be done by

experienced professionals.

7. Do not block any ventilation openings. Install

in accordance with Meyer Sound's installation

instructions.

13. Unplug this loudspeaker during lightning storms or

when unused for long periods of time.

8. Do not install near any heat sources such as radiators,

heat registers, stoves, or other apparatus that produce

heat.

14. Refer all servicing to qualiﬁed service personnel.

Servicing is required when the loudspeaker has been

damaged in any way, such as the power-supply cord

or plug is damaged, liquid has been spilled or objects

have fallen into the loudspeaker, the loudspeaker has

been exposed to rain or moisture, does not operate

normally, or has been dropped.

9. Do not defeat the safety purpose of the grounding-

type plug. A grounding-type plug has two blades and

a third grounding prong. The third prong is provided

for your safety. If the provided plug does not ﬁt into

your outlet, consult an electrician for replacement of

the obsolete outlet.

15. This loudspeaker provides protection against direct

sprays of water up to 15° from vertical. Rating IP42 in

accordance with IEC 60529.

10. Protect the power cord from being walked on

or pinched particularly at plugs, convenience

receptacles, and the point where they exit from the

loudspeaker. The AC mains plug or appliance coupler

shall remain readily accessible for operation.

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SAFETY STATEMENT

PLEASE READ THIS SECTION CAREFULLY AND IN

ITS ENTIRETY. IT CONTAINS CRITICAL INFORMATION

REGARDING SAFETY ISSUES, INCLUDING GUIDELINES

FOR GENERAL SAFE USE OF RIGGING SYSTEMS AS

WELL AS ADVISORIES ON GOVERNMENT REGULATIONS

AND LIABILITY LAWS. MEYER SOUND CANNOT BE

HELD RESPONSIBLE FOR CONSEQUENCES THAT MAY

ENSUE DUE TO FAILURE TO READ AND COMPLY WITH

INFORMATION IN THIS SECTION.

All load ratings and other speciﬁcations given in this

manual are the result of accepted engineering practice

and careful testing. However, such speciﬁcations and

ratings are subject to change. USERS ARE ADVISED

TO CHECK THE QUICKFLY SECTION OF THE MEYER

SOUND WEBSITE AT

http://www.meyersound.com

OR CONTACT TECHNICAL SUPPORT AT REGULAR

INTERVALS TO CHECK FOR UPDATED OR REVISED

INFORMATION.

SCOPE OF THIS MANUAL

Although this manual contains much useful information on

rigging in general, it does not claim to be a comprehensive

resource on the subject. This manual assumes that

the owners and/or users of a QuickFly system are

knowledgeable and experienced in the areas of rigging

and ﬂying loudspeaker systems. MANY ISSUES OF

CRUCIAL CONCERN, SUCH AS THE DETERMINATION

OF APPROPRIATENESS AND CONDITION OF VENUE

RIGGING POINTS, CANNOT BE ADDRESSED HERE.

THEREFORE, THE USER MUST ASSUME ALL

RESPONSIBILITY FOR THE APPROPRIATE USE OF

QUICKFLY SYSTEMS IN ANY PARTICULAR LOCATION

OR CIRCUMSTANCE.

REGULATORY COMPLIANCE

The engineering practices and safe working load (SWL)

ratings of the QuickFly system are in full compliance with

all known regulatory statutes currently applicable in the

United States. Unless otherwise speciﬁed, all working

loads are based on a 7:1 safety factor. However, as

noted above, there are wide variations internationally in

the regulations and practices applying to suspension of

sound systems in public places. Although regulations in

the United States are generally among the most stringent,

safety codes may be even stricter in a few localities

(such as those highly prone to earthquakes). In addition,

applicable safety codes are open to interpretation:

Government ofﬁcials in one location may have a stricter

interpretation than another local ofﬁcial, even when

operating under the same regulations and in the same

legal jurisdiction.

THE SUSPENSION OF LARGE, HEAVY OBJECTS IN

PUBLIC PLACES IS SUBJECT TO NUMEROUS LAWS

AND REGULATIONS AT THE NATIONAL/FEDERAL,

STATE/PROVINCIAL, AND LOCAL LEVELS. THIS

MANUAL DOES NOT ADDRESS THE SPECIFICS OF

ANY SUCH APPLICABLE LAWS AND GOVERNMENT

REGULATIONS. THIS MANUAL DETAILS PROCEDURES

AND PRACTICES CONSISTENT WITH THOSE

GENERALLY ACKNOWLEDGED AS ALLOWABLE AND

SAFE IN THE UNITED STATES. HOWEVER, THE USER

MUST ASSUME RESPONSIBILITY FOR MAKING SURE

THAT USE OF ANY QUICKFLY SYSTEM AND ITS

COMPONENTS IN ANY PARTICULAR CIRCUMSTANCE

OR VENUE CONFORMS TO ALL APPLICABLE LAWS

AND REGULATIONS IN FORCE AT THE TIME.

CONSEQUENTLY, USERS OF QUICKFLY RIGGING

SYSTEMS SHOULD BE PREPARED TO TAKE

ADDITIONAL SAFETY ASSURANCE MEASURES BEYOND

THOSE OUTLINED IN THIS MANUAL. IN ALL CASES,

IT IS THE RESPONSIBILITY OF THE USER TO MAKE

CERTAIN THAT ANY MEYER SOUND LOUDSPEAKER

SYSTEM IS SUSPENDED IN ACCORDANCE WITH ALL

APPLICABLE NATIONAL/FEDERAL, STATE/PROVINCIAL,

AND LOCAL REGULATIONS.

LOAD RATINGS AND SPECIFICATIONS

Long-term safe operation is a central concern in the

design and manufacture of any rigging/ﬂying system.

Meyer Sound has taken great care in material selection

and component design. In all critical cases, load points

are redundant, with a safety margin that allows one or

more load points to fail while maintaining system integrity.

After manufacture, all load-critical system components are

individually inspected.

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In addition to routine checks on the road for touring

systems, Meyer Sound also recommends a careful,

comprehensive system examination and testing “at

home” in the warehouse or other appropriate location at

regular intervals. At this time, each component should be

carefully inspected under ideal lighting conditions, and

then the entire system should be ﬂown as used for a ﬁnal

comprehensive check.

Advisory Note: Safety Responsibilities “Above

the Hook”

In most touring applications of rigging systems, the

touring sound provider is normally responsible for

ensuring the safety of the suspension system only below

the attachment point. The safety and suitability of the

attachment point is generally seen as the responsibility

of the venue owner or operator. However, this distinction

(“above the hook” versus “below the hook”) can be open

to interpretation. Touring system operators are advised

to double-check to make certain that attachment points

are approved and suitably load rated, and that the points

used are those identiﬁed as such by the venue owner

or operator. AS AN EXTRA PRECAUTION, CAREFUL

INSPECTION OF THE ATTACHMENT POINTS IS ADVISED

BEFORE FLYING, PARTICULARLY IN OLDER VENUES OR

THOSE HOSTING FREQUENT EVENTS USING LARGE

SOUND AND LIGHTING SYSTEMS. In any case, Meyer

Sound QuickFly systems are intended only for suspension

from approved rigging points, each known to have ample

SWL margins for the system components suspended

below them.

If any anomalies or defects are discovered that could

possibly affect the safety or integrity of the system, any

affected parts or subsystems should be replaced in their

entirety before that part of the system is ﬂown again.

REPLACEMENT PARTS

Any component found to be defective, or any safety-

related component you even suspect might be defective,

should be replaced with the equivalent, approved part.

Parts speciﬁc to a QuickFly system should be ordered

directly from Meyer Sound. No attempt should be made

to substitute what appears to be equivalent or “mostly the

same” generic replacements. Some parts used in QuickFly

systems are identical to those used in other rigging

applications. To the best of our knowledge, most of these

suppliers are reputable and their products are reliable.

However, Meyer Sound has no way of assuring the quality

of products made by these various suppliers. Therefore,

Meyer Sound is not responsible for problems caused by

components that were not supplied by Meyer Sound.

INSPECTION AND MAINTENANCE

The Meyer Sound QuickFly systems are an assembly of

mechanical devices, and are therefore subject to wear and

tear over prolonged use, as well as damage from corrosive

agents, extreme impact, or inappropriate use.

BECAUSE OF THE SAFETY ISSUES INVOLVED, USERS

MUST ADOPT AND ADHERE TO A SCHEDULE OF

REGULAR INSPECTION AND MAINTENANCE. IN

TOURING APPLICATIONS, KEY COMPONENTS MUST

BE INSPECTED BEFORE EACH USE. Such inspection

includes examination of all load-bearing components

for any sign of undue wear, twisting, buckling, cracking,

rusting, or other corrosion. In regard to rust and corrosion,

the main components of a QuickFly system are either

protected by an exterior coating or made from stainless

steel, which is impervious to rust and resistant to most

corrosive ﬂuids. Nevertheless, normal use and shipping

vibrations can wear through the protective coatings,

and extremely corrosive ﬂuids (such as battery acid)

can cause severe damage with prolonged exposure

even to protected parts. Particular attention should be

given to screws, bolts, and other fasteners to make

certain the ﬁttings are tight and secure. Metal seams and

welds should be examined for any sign of separation or

deformation. Meyer Sound strongly recommends that

written documentation be maintained on each QuickFly

system, noting date of inspection, name of inspector,

points of system checked, and any anomalies discovered.

TRAINING

Considering their sophistication and ﬂexibility, QuickFly

systems are relatively straightforward and easy to use.

Nevertheless, key points of assembly, rigging, and ﬂying

that must be fully mastered before a system is ﬂown.

Users should read this manual in its entirety before

attempting to deploy any QuickFly system. You may make

additional copies of this manual as necessary for in-house

use; copies may not be made for any other purpose.

vii

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viii

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CONTENTS

Introduction

Assembling Blocks for Transport

Truck Pack

M3D Transport

Before Hanging an M3D Array

Choosing Rigging Point Capacities

M3D Placement Calculator

Measuring a Venue

General Hanging Considerations

Do’s and Don’ts

Lifting Mechanisms

Use Front and Back Motors Whenever Possible

Choosing Pickup Points

Array Assembly and Angle Adjustment

Starting Array Assembly

Stacking an M3D Array

Attaching Motors to the MTG-3D Top Grid

Attaching M3Ds to the MTG-3D Top Grid

Adjusting Angles

MTG-3D Top Grid to First M3D Angle Adjustment

Adjusting Top M3D Top Grid Downtilt

Adjusting MTG-3D Top Grid Uptilt

Adjusting Splay Angle in an Array

Removing Caster Rails

Adding a Block of M3Ds to an Array

Flying a Completed Array

Including M3D-Subs in an Array

Striking the Array

Appendix A — Conﬁgurations and Load Ratings

General

About These Load Ratings

Measured Angles

Angle Between Bridle and Grid

Maximum Top Grid Angle

Bridle Leg Lengths

Conﬁguration A

Conﬁguration B

Conﬁguration C

Conﬁguration D

Conﬁguration E

Conﬁguration F

Conﬁguration G

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Appendix B — Physical Speciﬁcations

M3D Physical Speciﬁcations

M3D-Sub Physical Speciﬁcations

MTG-3D Top Grid Physical Speciﬁcations

Appendix C — MTF-3D Transition Frame Assembly Procedure

MTF-3D Transition Frame

Attaching Loudspeakers to Transition Frame

Attaching the Adjustable Link Assembly to the MRF-3D Rigging Frames

Rear

Front

Glossary

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M3D AND M3D-SUB QUICKFLY RIGGING MANUAL

Truck Pack

INTRODUCTION

M3Ds can be transported in blocks from one to four M3Ds

The M3D and M3D-Sub QuickFly rigging system is a

complete integrated solution for transporting and ﬂying

M3D and M3D-Sub loudspeakers. This system includes

everything below the motors, to the caster rails and covers

that carry and protect the system in transport. All the

hardware for rigging the system remains captive to the

loudspeakers and MTG-3D Top Grid. This manual is a

guide to transporting, assembling, adjusting, and striking

a vertical array of M3D and M3D-Subs. Also included

is information on the Meyer Sound M3D Placement

Calculator, a tool that provides the necessary mechanical

setup information for prerigging and hanging an M3D and

M3D-Sub system. For information on the operation of the

M3D and M3D-Sub, please refer to the M3D Operating

Instructions, part number 05.105.022.01.

high, whichever conﬁguration maximizes loading in the

truck and meets your needs (see Figure 1). These M3D

blocks can be packed three wide in a trailer. Blocks of one

or two M3Ds are lighter to move when on site, but may not

make as efﬁcient use of truck cargo space.

Throughout this document, we refer to the M3D

loudspeaker. To save space and avoid unnecessary

repetition, please note that in all cases — unless otherwise

indicated — “M3D” includes M3D and M3D-Sub. For

example, when we state “The ﬁrst step in preparing M3Ds

for transportation…” What is implied is, “The ﬁrst step in

preparing M3Ds and M3D-Subs for transportation…”

Figure 1. M3Ds packed in truck for transport

CAUTION: Because of weight and stability

considerations, we recommend that transport

blocks not exceed four M3Ds high.

ASSEMBLING BLOCKS FOR TRANSPORT

The ﬁrst step in preparing M3Ds for transportation is

to assemble the loudspeakers in modular blocks for

easy assembly. The number of M3Ds in a block will be

determined by the safest and most practical size for your

truck pack and load-in considerations.

The procedure in the section “Array Assembly and Angle

Adjustment,” may be considered suitable for assembling

the blocks for transport.

CAUTION: Take care if you use a forklift for

making or moving M3D blocks. There is no

protective metal frame at the bottom of an

M3D while it is on its caster rails, and the

forklift may damage the wooden cabinet.

Using protective padding or material over the

forks is recommended.

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Using a three- or four-high M3D block will make each

block heavier (see Table 1) and less stable, so the blocks

will require extra care when rolling over an uneven surface

and up truck ramps. Conversely, larger blocks will make

more efﬁcient use of a truck’s cargo space and make a

more efﬁcient load-in and strike.

The optional M3D transit covers, shown in Figure 2, are

constructed of wear-resistant nylon fabric with Velcro

closures to protect the M3D and loudspeakers from scuffs

and weather during transport.

Figure 2. M3D transit covers shown covering one-, two-, and four-high M3D blocks

Table 1: M3D Transport Blocks

Table 2. M3D Rigging and Replacement Parts

Number

of M3Ds

M3D Block Block Height Transit Cover

Item

Description

Part Number

45.105.028.01

40.105.092.01

Weight

Mounted on

Caster Rail

Part Number

MTG-3D Top grid for M3D arrays

MTF-3D Transition frame from

M3D arrays to CQ-2

415 lbs

28.56"

66.105.036.01

and MSL-4 downﬁlls

188.24 kg

830 lbs

7254 mm

49.31"

MRF-3D M3D & M3D-Sub Left

Side Rigging Frame

40.105.103.01

40.105.103.02

66.105.037.01

66.105.040.01

66.105.038.01

376.48 kg

1245 lbs

12525 mm

70.06"

Replacement Kit

MRF-3D M3D & M3D-Sub Right

Side Rigging Frame

564.72 kg

1660 lbs

17795 mm

90.81"

Replacement Kit

M3D & M3D-Sub Front

Cam-Link Replacement

40.105.104.01

40.105.104.02

68.105.072.01

752.96 kg

23066 mm

Table 1 notes:

M3D & M3D-Sub Rear

Link Replacement

1. The table above refers to M3Ds only. If transport

blocks include M3Ds and M3D-Subs or M3D-Subs

only, recalculate the block weights by replacing the

ﬁgure of 415 lbs (188.24 kg) with 395 lbs (179.17 kg).

M3D Rigging Spacer

Tool

Caster Rail Kit

40.105.033.01

134.007

QRP

M3D Quick Release Pin

2. An attached MTG-3D Top Grid will add approximately

11.0 inches (279.4 mm) to the height of the block and

approximately 308 lbs (139.71 kg) to the total weight

of the block.

3. The measurements are at 0˚ splay angles.

4. These measurements include the cover thickness.

5. The block height measurements include 7.81 inches

(198.4 mm) added to the block height by the caster

rails.

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TIP: Meyer Sound’s optional transit covers

will protect M3Ds stacked for transport. They

are easy to use, because one side opens

with Velcro seams, allowing two stagehands

to easily put on the cover without having to

lift it over the top of the block.

We suggest you strap each block, once loaded, with a

cargo strap to prevent rubbing through the covers and

damaging the M3D cabinets or adjacent equipment.

M3D Transport

As a reference, a three-high M3D block weighs

approximately 1245 pounds (564.72 kg), or about the

weight of a large-format mixing console, including its

case, a piano, or a set-cart.

TIP: Attaching the MTG-3D Top Grid to

the uppermost block of the array while

transporting an M3D system can minimize

labor and setup time. Use a wraparound,

open-top cover to protect the four sides of

the cabinets.

Figure 3. Block of four M3Ds on caster rails with transit cover

removed

If you transport the block with the MTG-3D Top Grid

attached, it should be in the middle of the outer two

blocks to allow the MTG-3D Top Grid to slide over the

other two blocks. This will also keep the MTG-3D Top

Grid away from the wall of the truck. If the block with the

MTG-3D Top Grid is placed against the truck wall, it must

be loaded with the extension side of the MTG-3D Top Grid

facing the inside (as opposed to the wall) of the truck. If

it is oriented toward the wall, the extra space taken will

prevent the third block from ﬁtting beside the other two.

BEFORE HANGING AN M3D ARRAY

Consider the following before you start hanging an M3D

array:

CAUTION: We strongly recommend that you

use a professional rigger when hanging any

system.

Alternatively, the cabinets may be transported in a two-

high module. A stacking row of other equipment may be

lifted on top while in the truck. The approximately 830-

pound (376.48 kg) weight for the two-high module will be

easier to manage in some types of venues.

CHOOSING RIGGING POINT CAPACITIES

The MTG-3D Top Grid is designed to allow the suspension

of all approved vertical M3D array conﬁgurations. For a list

of approved array conﬁgurations and their speciﬁcations,

refer to “Appendix A — Conﬁgurations and Load Ratings.”

NOTE: Because fewer M3Ds travel in each

block, more stage space, rigging, and

assembly time will be necessary.

The total allowable tilt of the MTG-3D Top Grid with an

array hung under it is ±25˚. The MTG-3D Top Grid allows

10˚ of vertical angle adjustment between the MTG-3D Top

Grid and the ﬁrst cabinet, from 0˚ to ±5˚ in one degree

increments. Refer to the section “MTG-3D Top Grid to

First M3D Angle Adjustment” for details.

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When choosing your rigging point capacities, always

keep in mind that the entire weight of the array may shift

completely to either the front or back points. Three factors

contribute to variations in the center of gravity:

the venue, as shown in Figure 4, can display up to three

balconies. The Meyer Sound M3D Placement Calculator is

approved by a certiﬁed structural engineering ﬁrm.

1. The curvature of the array

NOTE: You need a computer loaded with

Microsoft Excel in order to run the M3D

Placement Calculator.

2. The tilt of the entire array inclusive of the MTG-3D Top

Grid

3. The number and types of M3D elements and downﬁlls

used

The calculator is available online by ﬁlling out an

application form on the Meyer Sound web site at:

M3D PLACEMENT CALCULATOR

http://www.meyersound.com/forms/m3dcalcform.htm

The M3D Placement Calculator, shown in Figure 4,

is a mechanical design tool for calculating structural

information about an M3D and/or M3D-Sub array. It is

implemented as an Excel spreadsheet and provides

information regarding rigging loads and array placement

and aiming. A customizable graphic representation of

The download location and password will be emailed to

you at the email address you enter on your application.

Figure 4. M3D Placement Calculator and link to detailed user instructions

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Another less accurate option is to measure the venue by

pacing it off, using a pedometer similar to item 3 in Figure

5, and using this measurement to make an educated

estimate.

MEASURING A VENUE

You are required to enter the venue’s dimensions into the

M3D Placement Calculator.

If scaled sectional drawings of the venue are available, you

can use the dimensions from these drawings to determine

the M3D array setup.

Figure 5 shows some tools that can aid in the process of

aligning an array and focusing it to the requirements of a

speciﬁc venue:

If scaled sectional drawings of the venue are not available,

you can measure the venue by using a laser range ﬁnder,

or alternatively, a long measuring tape.

1. Binoculars

2. Laser measuring tool

3. Pedometer

4. Laser inclinometer

5. Self-leveling, four-way laser

Figure 5. Useful array alignment tools

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Once you enter measurements into the M3D Placement

Calculator, it will help you visualize the approximate

vertical splay angles needed. The calculator will also help

with other rigging considerations. Save the results of these

calculations for use when you assemble the M3D array

as described in the section “Array Assembly and Angle

Adjustment.”

GENERAL HANGING CONSIDERATIONS

Before starting the actual array assembly and hanging

process, review this section:

DO’S AND DON’TS

DO: Use only properly trained personnel to assemble and

hang M3D arrays.

A laser measuring tool, similar to item 2 in Figure 5, may

also be used to measure the height of venue rigging

beams and the trim height of the array.

DO: Pay attention at all times when moving the array with

a motor system. It is often difﬁcult to see the physical

orientation when you are very close to the array. Have a

spotter, as shown in Figure 6, provide “a second set of

eyes” at a position different from the motor operator.

TIP: When making measurements and

adjustments to an array, it is much more

convenient to use a laser measuring tool than

a measuring tape.

The M3D Placement Calculator is not an acoustical design

tool and cannot be used to predict array coverage. To

facilitate accurate coverage predictions, however, the

calculator provides detailed positional data that can be

entered into Meyer Sound’s MAPP Online™ acoustical

prediction program. In combination, these two Meyer

Sound tools give you the ability to predict sound coverage

and to calculate the physical placement of arrays to

accomplish the prediction.

The weight distribution ﬁelds shown in the M3D Placement

Calculator are calculated for the array in its ﬁnal trim

position. During array assembly, it may be necessary for

the front or rear motors to temporarily support the entire

weight of the array. Therefore, when planning the rigging

point loads, you must always plan on this fact regardless

of the results shown in the "Weight on Front/Rear Motor"

ﬁelds.

Figure 6: Using a spotter as a “second set of eyes”

DON’T: Place hands between the cabinets.

DON’T: Use the rear cabinet ring/stud ﬁttings for rigging

cabinets or pull back. Use them for system cable support

only. (Refer to the M3D Operating Instructions for cabling

details.)

NOTE: The Instructions link at the top of the

M3D Placement Calculator page provides

complete instructions for using the M3D

Placement Calculator.

DON’T: Allow the center of gravity to move outside of the

MTG-3D Top Grid once it is in its ﬁnal trimmed position.

The M3D's rigging system is designed to be rigid, which

allows for tilting up or down while maintaining the set

relative splay between cabinets and alleviating the need

for any pull back to be used.

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LIFTING MECHANISMS

USE FRONT AND BACK MOTORS WHENEVER

POSSIBLE

The number and lift capacity of chain motors used to lift

the array are dependent on the array’s combined weight,

including the weight of any underhung clusters, and

its orientation and splay. For a smaller array, it may be

sufﬁcient to use 1-ton motors, but for larger arrays, 2-ton

motors may be necessary.

Front-to-back bridle point conﬁgurations, illustrated in

Figure 7 and conﬁgurations A, E, and F in “Appendix A

— Conﬁgurations and Load Ratings,” allow the use of

motors to provide the necessary vertical tilt to the array.

This provides the easiest conﬁguration to use for trimming

vertical tilt for an array.

The lift capacity of any single motor or set (in a four-

hoist conﬁguration) of motors must be sized to support

the entire weight of the array, including cable. When you

are assembling the array, as the cabinets are attached,

level the bottom cabinet to allow the next waiting block

to be attached. Because there is often a vertical curve in

the array, the upper cabinets have an increasing uptilt.

At some point, depending on the vertical splay angles

used, the rear motor(s) may not be supporting any weight.

At this point, the front motor(s) must support the entire

weight of the array while it is being assembled.

Conversely, once the array is assembled and ﬂown into its

ﬁnal position, it is likely that the MTG-3D Top Grid will be

much closer to level. In this conﬁguration, the majority of

the weight then shifts to the rear motor(s). If the array has

downtilt and a curve is being used, the weight may then

shift closer to the rear motor(s).

Figure 7. Bridles may be used in a front-to-back hanging

conﬁguration

Furthermore, when you are using three or four motors

and lifting the array during assembly, the array may not

be level in the other plane (onstage vs. offstage). Further

weight will shift onto the highest motor, requiring that

motor to have a larger capacity.

If front and back motors cannot be used to provide the

required vertical tilt of an array, such as conﬁgurations

B, C, and D in “Appendix A — Conﬁgurations and Load

Ratings,” the technician can use the variable tilt capability

of the MTG-3D Top Grid, to achieve the desired vertical tilt

angle for the array. Refer to the section “MTG-3D Top Grid

to First M3D Angle Adjustment.”

The MTG-3D Top Grid is designed to have the motors

attached to its pickup points at either the center set of the

MTG-3D Top Grid’s main frame, the four corner sets on

the main frame, or the front and rear sets of tabs on the

extension frame in its retracted or extended position.

Refer to the rigging conﬁgurations and their associated

tables in “Appendix A — Conﬁgurations and Load

Ratings” for details on allowable weights, pickup points,

bridle lengths, and the maximum allowable number of

loudspeakers for the conﬁguration you will be rigging.

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3. The array may develop as much as 3 feet of

downstage (front) curve (see Figure 8) while being

assembled. Often, the array will be assembled near

the downstage edge or a similar situation. Calculate

the depth of the system to ensure that the lower M3Ds

will be able to be attached to the bottom of the array

as it moves downstage during assembly.

NOTE: When using chains or making custom

bridle lengths to achieve vertical tilt, be sure

the center of gravity of the ﬁnal hung array is

within the allowable limits of the MTG-3D Top

Grid. (See “M3D Placement Calculator.”).

TIP: Some venues, such as theaters, have

only side-to-side motor points available

through the ceiling plaster. In this case, you

can rig two front/rear motors through the

same ceiling hole, but attach them separately

to the venue’s structural steel beams,

provided that the single point is sufﬁciently

rated for the entire weight of the array. The

two steel cable sets must be held together

with a loose shackle slightly below the plaster

ceiling to prevent damage to the ceiling as

the chain or steel pulls sideways when the

array is raised to its desired position.

CHOOSING PICKUP POINTS

When choosing rigging points, refer to “Appendix A

— Conﬁgurations and Load Ratings,” for various hanging

conﬁgurations, maximum weights, bridle lengths, and

array limits for 5:1 and 7:1 safety factors. Use these values

as applicable rigging for the venue.

It is also important to keep in mind the following

considerations:

1. The most ﬂexible hanging conﬁguration is one similar

to that shown in the section “Conﬁguration F” in

Appendix A to hang the array directly from a venue’s

structural beam without using bridles. Fewer bridles

will improve the efﬁciency of rigging, adjusting vertical

trim and adjusting horizontal orientation.

Figure 8. M3D array 12-deep side view during assembly and

in ﬂown position

4. The array may develop as much as 7 feet of upstage

(rear) curve (see Figure 8) when ﬂown into position.

If there is a wall or upstage structure, calculate the

depth of the system to ensure that it can be ﬂown into

its intended position after assembly and vertical trim

is applied. The M3D Placement Calculator will provide

the total array depth.

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In the conﬁgurations shown in Figure 9, the motors will be

outside of the actual MTG-3D Top Grid dimensions. The

technician will need to pull the motors in to attach them

to the MTG-3D Top Grid. When the array is ﬂown into

position, it will ﬁnd its own center of gravity between the

motors. In windy conditions, this will also reduce swaying.

This method minimizes any chance of a cable pic turning

the array. If three or four motors are used and the array is

slightly off its ideal horizontal angle, individual motors can

then be used to turn the array once it is close to its ﬁnal

trimmed position.

TIP: If the bottom of the array ends up being

too far downstage during assembly, have

stagehands breast it upstage until assembly

is complete and it is ﬂown to its ﬁnal trim

position.

5. It is often necessary to increase the stability of an

array in venues with very high structural steel from

which the array is suspended. The rigging points

can be located a small distance, that is, 6 inches

(152.4 mm) diagonally, from the MTG-3D Top Grid

dimensions for a four-motor conﬁguration. For a two-

motor conﬁguration, the rigging points can be located

a small distance outside of the MTG-3D Top Grid’s

depth, as shown in Figure 9.

ARRAY ASSEMBLY AND

ANGLE ADJUSTMENT

You will need the following items for assembling the array

and adjusting the angle:

 Quick release pins (QRPs)

 Cable assembly

 Alignment block (optional)

 Vertical angle conﬁguration

STARTING ARRAY ASSEMBLY

After determining that you have all the necessary

equipment and tools, proceed as follows:

Structural Steel Rigging Point

1. Choose the appropriate motor points for the rigger to

prepare the ground rigging of a hanging conﬁguration,

selecting from the options shown in “Appendix A

— Conﬁgurations and Load Ratings.”

6" to 12" Outside of Rigging Frame

2. Once the points have been rigged, check for accuracy

and ensure that the climbing riggers have ﬁnished all

the points for the array before applying any weight to

these points.

3. Apply power to the motors, checking for correct

electrical phase (chain movement direction — see

Figure 10). Change phase if necessary.

Structural Steel Rigging Point

6" to 12" Outside of Rigging Frame

Figure 9. Example of wide rigging

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STACKING AN M3D ARRAY

ATTACHING MOTORS TO THE MTG-3D TOP

GRID

Use rated steel cables and shackles when attaching

motors to the MTG-3D Top Grid, as shown in Figure 12.

The MTG-3D Top Grid will accommodate 5/8-inch and

3/4-inch shackle sizes on its pickup points.

Figure 10. Checking phase (chain direction)

4. Run the chain through the motors until they are

approximately 2 feet off the ground.

5. Attach the chain bags and feed the unused chain into

the bag.

6. If using 2-ton motors, check for any twists in the

overhead chain and correct if necessary (see Figure

11).

Figure 12. Attaching motors or bridle legs to the MTG-3D Top

Grid

The extension frame on the MTG-3D Top Grid is provided

to help keep the center of gravity evenly distributed

between the front and back points. This frame can be

used in either the retracted or the extended positions,

depending on which will provide the most even weight

distribution when the array is in its ﬁnal trimmed

conﬁguration.

The M3D Placement Calculator provides weight

information on the front and back loads to help select the

correct pickup lotions — back rigging point (BRP) 1, 2,

or 3 — prior to the array being rigged. However, during

assembly it may be necessary for the front or rear motors

to temporarily support the entire weight of the array.

Figure 11. Rigger checking overhead chain

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The allowable system center of gravity range must be

within the front rigging point and one of the pickup

choices provided, as illustrated in Figure 34 on page 26.

1. Once the motors are attached to the MTG-3D Top

Grid, raise the MTG-3D Top Grid, as shown in Figure

13, to the necessary working height in preparation for

attaching the ﬁrst block of M3Ds. Adjust the MTG-3D

Top Grid to be parallel with the top M3D of the block.

 BRP 1 from the main frame

 BRP 2 from the extension frame retracted

 BRP 3 from the extension frame extended

CAUTION: An array in which the center of

gravity falls outside the allowable range of

the MTG-3D Top Grid, once it is in its ﬁnal

trimmed position, is unstable and therefore

unacceptable!

Refer to “Appendix A — Conﬁgurations and Load Ratings”

for allowable weights, bridle lengths, and number of M3D

loudspeakers.

CAUTION: Always use properly rated rigging

shackles, chain, and hardware to attach the

Figure 13. The MTG-3D Top Grid raised for pick up of the ﬁrst

M3D block

motors to the MTG-3D Top Grid. Be sure that

the motors, hardware, and rigging points are

sized appropriately for the entire weight of

the array. The M3D Placement Calculator can

help in determining the load of the system

you are planning to hang.

2. Carefully lower the MTG-3D Top Grid, positioning it

just over the top M3D in the block, as shown in Figure

14.

ATTACHING M3DS TO THE MTG-3D TOP GRID

Use properly rated hardware to attach the rigging steel

and motors to the MTG-3D Top Grid.

CAUTION: Everyone involved in assembling

an array should be coached not to place their

hands between the cabinets and the frames.

Figure 14. The MTG-3D Top Grid positioned over the ﬁrst

M3D block

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ADJUSTING ANGLES

By using both MAPP Online and the M3D Placement

Calculator, you should now have determined the required

tilt for the MTG-3D Top Grid and splay angles between

elements for your array.

The M3D Placement Calculator (see “M3D Placement

Calculator”) also provides a warning indication if the

center of gravity falls too close to, or outside of, the

front or back point that was chosen in the array’s ﬁnal

conﬁguration.

MTG-3D TOP GRID TO FIRST M3D ANGLE

ADJUSTMENT

The MTG-3D Top Grid allows for an adjustment of 0˚ to

±5˚ between the MTG-3D Top Grid and the ﬁrst M3D

loudspeaker.

0˚ to -5˚

If your conﬁguration is front-to-back type A, E, or F as

described in “Appendix A — Conﬁgurations and Load

Ratings,” the entire vertical array of M3D loudspeakers

can easily be tilted up or down to help focus the array’s

coverage onto a target area by adjusting the front and

back motor points.

Figure 15. The MTG-3D Top Grid’s link in retracted position

Adjusting Top M3D Top Grid Downtilt

The total allowable tilt of the MTG-3D Top Grid with an

array hung under it is ±25˚, provided that the center of

gravity of the array remains inside the MTG-3D Top Grid.

With the MTG-3D Top Grid’s rear link in the retracted

position (as shown in Figure 15 and Figure 16), the front

CamLink can be adjusted to provide between 0˚ and

5˚ of downtilt. The MTG-3D Top Grid’s rear link works

in combination with the front CamLink to produce the

desired angle of downtilt.

CAUTION: Note that the weight on each

motor shown by the M3D Placement

Calculator is the static load when the

loudspeaker array is in its ﬁnal position and

DOES NOT calculate dynamic forces induced

during setup. Each set of front and back

or side-to-side motors should be sized to

withstand the full weight of the loudspeaker

array.

If the array must be hung in a side-to-side hanging

conﬁguration (conﬁguration B, C, or D in “Appendix A

— Conﬁgurations and Load Ratings”), you can set the ﬁnal

rigging tilt angle for the array by using the MTG-3D Top

Grid’s rear link adjustment. Using the links of deck chains

or using different lengths on the two bridle legs from a

motor are effective methods of achieving tilt on a MTG-3D

Top Grid.

Figure 16. The QRP securing rear link in retracted position

Figure 15 and Figure 17 illustrate how the MTG-3D

Top Grid's CamLinks and rear links can be used for a

necessary tilt adjustment of the ﬁrst M3D.

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Figure 18 shows the MTG-3D Top Grid with the rear link

extended. Note the direction of tilt with this conﬁguration.

Adjusting MTG-3D Top Grid Uptilt

With the MTG-3D Top Grid’s rear link in the extended

position (as shown in Figure 17 and Figure 18), the front

CamLink can be adjusted to provide between 1˚ and

5˚ of uptilt. The MTG-3D Top Grid’s rear link works in

combination with its front CamLink to produce the desired

angle of uptilt.

+1˚ to +5˚

Figure 18. MTG-3D with the rear link extended

CAUTION: The MTG-3D Top Grid’s rear link

must ALWAYS be installed when hanging an

M3D system. NEVER install a QRP into the

MTG-3D Top Grid without using the MTG-3D

Top Grid’s 5˚ rear link.

Figure 17. The MTG-3D Top Grid’s link in the extended

position

1. Once the loudspeaker’s rear links are pinned into

the retracted or extended position as required of the

MTG-3D Top Grid’s rear link, unpin the CamLinks from

the MTG-3D MTG-3D Top Grid as shown in Figure 19.

TIP: You can mount laser devices, such as

item 4 in Figure 5, on top of the array to

determine the top cabinet orientation with

respect to actual venue seating. Additionally,

you can mount the laser on any cabinet in the

array to determine that the system is properly

aimed. These devices can be conﬁgured to

be controlled from the ground.

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3. Bump the motors as needed to relieve sheer stress on

the QRPs in order to free them from the holes.

4. Bump the motors to pull the cabinet further upward

until the desired CamLink hole is correctly aligned.

CAUTION: Do not hold the CamLink by

placing your ﬁngers between the cabinets.

5. Check the hole alignment by moving the CamLink

from the side of the cabinet as it swings through the

rigging frames.

CAUTION: Always check that all four QRPs

are fully inserted into the MTG-3D Top Grid

and loudspeaker’s end frames before lifting

an array.

Figure 19. Removing the QRP from the MTG-3D Top Grid’s

front CamLink

2. Adjust the motors to tilt the MTG-3D Top Grid and

allow the CamLink to move until the QRP can be

inserted into the required hole.

6. A stepped alignment block as shown in Figure 21

is shipped with each MTG-3D Top Grid. Additional

alignment blocks are available from Meyer Sound.

The alignment block helps set splay angles between

cabinets. The stepped block maintains the gap

between the cabinet’s front edges, producing a splay

angle.

3. Insert the QRP into the desired CamLink hole as

shown in Figure 20.

CAUTION: Always check that all four QRPs

are fully inserted into the MTG-3D Top Grid

and loudspeaker’s end frames before lifting

an array.

7. Place the alignment block between the M3D’s front

edge while the CamLink’s QRPs are removed as

shown in Figure 21.

8. While resting the adjustment block’s desired gap

distance on the center of the lower cabinet, bump the

motors in (down) so that the cabinets are just resting

on the block.

Figure 20. QRP inserted at 3˚

ADJUSTING SPLAY ANGLE IN AN ARRAY

9. Swing the CamLink into place, and set the QRP into

the frame.

1. Once all four QRPs are installed in the top cabinet of

the block, bump the motors out to take tension off the

cabinets.

2. If splay adjustment is required between M3Ds, remove

the QRPs from the CamLinks on either side of the

uppermost set of cabinets.

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Figure 21. Adjusting angle using the alignment block

Figure 22. Unpinning caster rail

TIP: For easier management of the caster

CAUTION: When the QRPs are removed

from the CamLinks, take care when adjusting

rails, stack them in an empty motor case

(with lids open if necessary) after removal.

They may then be rolled away and returned

for strike without carrying each caster rail

individually to storage.

the motor hoists. If the motors are raised too

high with only the rear link’s QRPs installed,

the lower loudspeaker block can swing under

the upper block of ﬂown loudspeakers.

Always use small motor bumps when rigging

the system while in this state.

REMOVING CASTER RAILS

1. Once the ﬁrst block of M3D loudspeakers is lifted into

the air, ﬂy the assembly to a working height (about

waist high) that will allow easy access to and removal

of the caster rails from the end frames.

2. Unpin the caster rails as shown in Figure 22 and

reinsert one QRP to secure the CamLink. Store the

second pin in the rear link hole. Lift the bottom plate

of the caster rail by leveling the bottom, relieving the

stress on the end frame. Slide them off the end frames

as shown in Figure 23.

Figure 23. Removing caster rail

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3. Move the CamLink to the 0˚ position and secure with a

QRP as shown in Figure 24.

4. While the upper array is still ﬂoating, visually align the

cabinets to be sure the CamLinks will not bind into the

mating end frame.

5. Once the rear link is sitting inside the end frame, move

the QRP into the end frame’s hole, awaiting alignment

with the rear link as shown in Figure 26.

TIP: Use small motor bumps (small

movements up or down) as the alignment

gets closer. You may ﬁnd that going “down”

past the alignment hole and then bumping

up gives you ﬁner control.

Figure 24. Front CamLink in up position, QRP inserted

You are now ready to assemble another block of

loudspeakers to the array.

ADDING A BLOCK OF M3DS TO AN ARRAY

1. Raise the assembled array so that the next block of

cabinets can be moved into place. The lowest cabinet

of the hung array should be level to the next block.

Have the motor operator adjust the front and back

hoists as necessary.

Figure 26. Inserting QRP into rear link

2. Fold the rear link out of the top cabinet and hold it in

place using a QRP as shown in Figure 25.

6. Attach the two rear QRPs ﬁrst, as shown in Figure 27,

keeping the front CamLinks tucked away in the frame.

7. If the array isn’t level, left to right, use the motors to

adjust the ﬂown block of cabinets (if using three- or

four-motor hoists).

8. If using only two motors (front and back), pin the ﬁrst

(or lowest) rear link in, bump the motors in, and then

attach the second pin.

Figure 25. Holding the rear link using a QRP

3. Lower the ﬂown assembly down onto the waiting

block of M3D loudspeakers.

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10. Use up or down motor bumps to pivot (or hinge) the

lower block to the upper cabinets, allowing you to set

the QRP into the desired CamLink hole as shown in

Figure 28 and secure it as shown in Figure 29.

Figure 27. Rear link QRP inserted

TIP: Here is another technique for setting

the rear link. Position the upper array

approximately 1 inch (25 mm) above the

waiting cabinet block. Push the ﬂown array

behind the lower block approximately 2

inches (50 mm). Fold out the rear link(s) and

rotate them into the end frame of the upper

cabinet while swinging the upper array back

to its original position..

Figure 29. QRP fully inserted into 3˚ hole

9. Once the two rear links are connected, unpin the

CamLinks and set the pin to the desired hole in the

CamLink as shown in Figure 28.

Figure 30. 0.25" (6.35 mm) drift punch

NOTE: If cabinets are on uneven ground

or aligned at a slight diagonal, the front

and rear CamLink/frame holes may be only

partially aligned. Insert a 0.25-inch (6.35 mm)

drift punch (see Figure 30) into the frame

hole, and “lever” the CamLink into place

by pushing or “wiggling” it in the desired

direction. A drift punch is available from a

hardware store.

Figure 28. Inserting QRP at 3˚

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5. After the M3D array has been ﬂown into its ﬁnal

vertical position, check the horizontal angle of the

array. If the array is not parallel to the stage or the

array is not aimed in the desired direction, use rigging

ropes tied to the lower sides of the array to rotate the

array into its ﬁnal, correct position.

FLYING A COMPLETED ARRAY

Figure 31 shows an example of rigging points chalked on

the ground, a fully rigged block of three M3D loudspeakers

with an MTG-3D Top Grid mounted, positioned, and ready

to ﬂy.

Use the following procedure to ﬂy rigged blocks and

arrays into their ﬁnal position.

TIP: You can quickly check the vertical

orientation by looking through the horizontal

spaces between the cabinets. It is usually

easy to see light through these spaces in

an outdoor venue. Often the cabinets are in

a darker area than the daylight and, using

this method, it is possible to match the two

sides and see where they are focused. It

is also possible to check other locations in

the venue, such as the front-of-house mixer

area. Binoculars, item 1 in Figure 5, are also

a helpful tool for seeing these gaps from a

distance..

Cable tie-down rings at the rear of the M3D cabinet are

provided as shown in Figure 32.

Figure 32. M3D cable tie-down rings

Figure 31. Fully rigged M3D block ready to ﬂy

Cable connectors are protected from wet weather by the

rain hood as shown in Figure 32.

1. If the array has front-to-back rigging hoists

(conﬁguration type A, E, or F as described in

“Appendix A — Conﬁgurations and Load Ratings”),

raise the rear motors until they are bearing weight

along with the front motors.

CAUTION: Do not use the cable tie-down

rings at the rear of the M3D for pullback or

position adjustment of the array.

2. Raise the array to its ﬁnal trim height.

3. If the array has front-to-back rigging, adjust the array’s

vertical tilt to the desired angle using the front and rear

motors as required.

4. If the array has side-to-side rigging, (conﬁguration

type B, C, or D as described in “Appendix A

— Conﬁgurations and Load Ratings”) check that

the array angle set in the procedure described in

“Adjusting Angles” is correct in the ﬂown array and

make any ﬁnal adjustments as needed.

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INCLUDING M3D-SUBS IN AN ARRAY

M3D-Subs can be included in an array in the same

manner as M3Ds.

Refer to the M3D Operating Instructions for details on

the use of M3D-Subs in an array and suggestions for the

optimum conﬁguration with M3D loudspeakers to achieve

the desired coverage and sound pressure level (SPL) for

a venue while maintaining maximum headroom for all

elements of the array.

The M3D-Subs may be stacked up to four high for

transport and use. They usually don’t need to be

restacked in the truck or in the venue, so they require

fewer stagehands. The cable harnesses can be built for

modules of three or six, resulting in a very efﬁcient setup

and strike.

Figure 33. M3D blocks ready for transport with vertical splay

left in

STRIKING THE ARRAY

TIP: Note that the MTG-3D Top Grid is

attached to the block at the right in Figure

33. This provides a convenient method of

transport, and the top block in the array is

ready for assembly at the next venue.

Taking down an M3D system is basically the reverse of the

installation process.

1. Attach the caster rails to the lowest cabinet as

the array is being lowered and when the bottom

loudspeaker is at about waist height.

2. Level the bottom cabinet to keep it as parallel as

possible to the ﬂoor.

3. While applying some pull on the QRPs holding the

CamLinks that you want to restore to 0˚, lower the

array onto the caster rails.

4. Stop the motors once both QRPs are pulled out from

the array.

5. Slowly bump the motors down until you can reinsert

the QRPs into the 0˚ hole.

6. Repeat this process until the ﬁrst block is fully restored

to 0˚.

7. Break the block away from the array by pulling all four

QRPs, and then bumping the array up to allow the

lowest block of cabinets to be wheeled away.

8. Repeat this process until all blocks are removed from

the array and the MTG-3D Top Grid is removed from

the rigging shackles.

TIP: When touring or using the same array

multiple times, you can leave the set vertical

splay angles in the blocks of cabinets while

in transport for speedier strike and setup as

shown in Figure 33. This also minimizes the

adjustments made between cabinets when

touring.

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APPENDIX A — CONFIGURATIONS AND LOAD RATINGS

GENERAL

MEASURED ANGLES

This appendix contains various hanging conﬁgurations

for M3D loudspeakers using an MTG-3D Top Grid. This

appendix also contains allowable conﬁgurations of bridle

attachments, bridle lengths, attachment points on the

MTG-3D Top Grid, the maximum weight, and maximum

number of M3D loudspeakers for each conﬁguration.

Two angles are used in the following tables. The values

are shown in two columns: one is labeled “Angle between

Bridle and Grid” the other is labeled “Max Top Grid Angle.”

Angle Between Bridle and Grid

The maximum number of M3Ds that may be hung in each

pickup conﬁguration is based on the M3D weight of 415

pounds (188.24 kg). The suspended weight listed in these

tables includes loudspeakers, the MTG-3D Top Grid, and

all auxiliary equipment supported by the rigging motor.

The weight values listed in the tables are the maximum

allowable weights and not the actual weight of the array.

This angle (α) is measured between the top of the MTG-

3D Top Grid and an attached bridle leg. In the following

examples, the bridle legs are presumed to be of equal

length so the angle formed by each bridle leg and the top

grid are equal.

Maximum Top Grid Angle

This angle is used to determine the maximum amount of

tilt of the MTG-3D Top Grid from horizontal. The values in

this column are the maximum tilt angles allowed.

CAUTION: The weight of any additional

items, such as ﬁll loudspeakers, hung

with the array must be considered when

calculating the maximum load.

NOTE: The maximum top grid angle does

not include any array tilt obtained by using

the MTG-3D Top Grid’s front and rear links.

ABOUT THESE LOAD RATINGS

All the load ratings in this appendix rate the M3D rigging

system for the shifts in weight that can occur during

installation of an array while maintaining a 5:1 or 7:1 safety

factor. When ﬂying an M3D array as discussed in this

manual, the entire weight of the array can shift completely

to either the front or the back motor or set of motors. We

have maintained this rating in all conﬁgurations shown

in this appendix in order to comply with the majority of

regional safety codes for theatrical rigging practices.

Bridle Leg Lengths

The various bridle lengths listed in the following tables

are the minimum required to support the corresponding

number of M3Ds listed.

CAUTION: Using a bridle leg shorter than

Scenarios shown in A, E, F, and G of this appendix

assume a “worst case” load between any single motor or

pair of motors and steel cable sets. If careful monitoring of

the weight distribution is maintained during the lifting and

ﬁnal trimmed position of an array, the motors and rigging

hardware capacities shown in the tables may be adjusted

accordingly to maintain a rated working load for your

region.

the recommended length may damage the

MTG-3D.

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the attachment points on the MTG-3D Top Grid is 52.50

inches (1334 mm).

CONFIGURATION A

Figure 34 illustrates the hanging conﬁgurations that

are considered in the calculations listed in Table 3 and

Table 4. In these conﬁgurations, the distance between

Back Rigging Point (BRP) 1

BRP 2

BRP 3

Figure 34. Bridles in front-to-back conﬁguration with the rear extension frame either retracted or extended

Table 3. Suspended Weight and Quantity of M3D Loudspeakers with Varying Bridle Leg Lengths

5:1 Safety Factor

7:1 Safety Factor

Angle

Between

Bridle

and Grid

α (deg)

Max

Top

Grid

Angle

Maximum

Allowable

Qty. of

Maximum

Allowable

Bridle Leg

Lengths

Maximum Allowable

Suspended Weight

Maximum Allowable

Suspended Weight

Qty. of M3Ds

M3Ds

3.0ft.(9100mm)

3.5ft.(1070mm)

4.0ft.(1220mm)

4.5ft.(1370mm)

5.0ft.(1520mm)

5.5ft.(1680mm)

6.0ft.(1830mm)

6.5ft.(1980mm)

7.0ft.(2130mm)

7.5ft.(2290mm)

8.0ft.(2440mm)

8.5ft.(2590mm)

9.0ft.(2740mm)

43˚

51˚

57˚

61˚

63˚

65˚

69˚

71˚

72˚

73˚

74˚

75˚

76˚

±25˚

2406 lbs (1091.34 kg)

3202 lbs (1452.40 kg)

3924 lbs (1779.90 kg)

4608 lbs (2090.15 kg)

5268 lbs (2389.52 kg)

5913 lbs (2682.09 kg)

6547 lbs (2969.67 kg)

7172 lbs (3253.16 kg)

1 to 5

1718 lbs (779.27 kg)

2287 lbs (1037.37 kg)

2803 lbs (1271.42 kg)

3291 lbs (1492.77 kg)

3763 lbs (1706.87 kg)

4224 lbs (1915.97 kg)

4676 lbs (2121.00 kg)

5123 lbs (2323.75 kg)

5565 lbs (2524.24 kg)

6004 lbs (2723.37 kg)

6441 lbs (2921.59 kg)

6875 lbs (3118.45 kg)

7307 lbs (3314.40 kg)

1 to 3

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Table 4. Minimum Allowable Bridle Leg Lengths with Varying Number of M3D Loudspeakers

5:1 Safety Factor

Maximum Angle

7:1 Safety Factor

Maximum Angle

Between Bridle and

Grid α (deg)

Maximum Number of

M3Ds

Between Bridle and

Minimum Allowable

Bridle Leg Lengths

Minimum Allowable

Bridle Leg Lengths

Grid α (deg)

43˚

47˚

51˚

57˚

59˚

61˚

62˚

63˚

65˚

68˚

70˚

71˚

3.00 ft. (910 mm)

3.25 ft. (990 mm)

3.50 ft. (1070 mm)

4.00 ft. (1220 mm)

4.25 ft. (1300 mm)

4.50 ft. (1370 mm)

4.75 ft. (1450 mm)

5.00 ft. (1520 mm)

5.50 ft. (1680 mm)

5.75 ft. (1750 mm)

6.25 ft. (1910 mm)

6.50 ft. (1980 mm)

47˚

52˚

57˚

61˚

63˚

65˚

68˚

70˚

72˚

73˚

74˚

75˚

76˚

3.25 ft. (990 mm)

3.75 ft. (1140 mm)

4.00 ft. (1220 mm)

4.50 ft. (1370 mm)

5.00 ft. (1520 mm)

5.50 ft. (1680 mm)

5.75 ft. (1750 mm)

6.25 ft. (1910 mm)

6.75 ft. (2060 mm)

7.25 ft. (2210 mm)

7.75 ft. (2360 mm)

8.25 ft. (2510 mm)

8.75 ft. (2670 mm)

The suspended weight allowable for each bridle length is

shown for both a 5:1 and a 7:1 safety factor. These weights

are based on total suspended weight, including M3D

loudspeakers and an MTG-3D Top Grid.

The minimum allowable bridle lengths shown in Table 4

are based on both a safety factor of 5:1 and a safety factor

of 7:1. Use the appropriate value when using Table 4 to

calculate allowable bridle lengths and allowable number of

M3D loudspeakers that may be hung in a speciﬁc venue.

NOTE: Each motor must be rated to support

the total weight of the entire array, including

any added equipment or loudspeakers.

NOTE: The maximum number of M3D

loudspeakers that may be hung in each

pickup conﬁguration is based on the M3D

weight of 415 pounds (188.24 kg). The

suspended weight includes loudspeakers

and an MTG-3D Top Grid.

The distance between lifting lugs in the conﬁgurations

shown in Figure 34 is 52.5 inches (1334 mm).

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Use Table 5 and Table 6 when the lifting conﬁguration uses

bridle legs spanning the short sides of the M3D as shown

in Figure 35.

CONFIGURATION B

Figure 35. Using bridle leg short side pickup points (BRP 1)

Table 5: Suspended Weight and Quantity of M3D Loudspeakers with Varying Bridle Leg Lengths

Angle

Between

Bridle

and Grid

α (deg)

5:1 Safety Factor

7:1 Safety Factor

Max

Top Grid

Angle

Maximum

Bridle Leg

Lengths

Maximum Allowable

Suspended Weight

Allowable

Maximum Allowable

Suspended Weight

Allowable

Qty. of M3Ds

2.0ft.(610mm)

2.5ft.(760mm)

3.0ft.(910mm)

3.5ft.(1070mm)

4.0ft.(1220mm)

4.5ft.(1370mm)

5.0ft.(1520mm)

51˚

60˚

66˚

68˚

72˚

74˚

76˚

±25˚

3317 lbs (1504.57 kg)

4570 lbs (2072.92 kg)

5742 lbs (2604.53 kg)

6874 lbs (3117.99 kg)

7983 lbs (3621.03 kg)

2369 lbs (1074.56 kg)

3265 lbs (1480.98 kg)

4101 lbs (1860.18 kg)

4910 lbs (2227.14 kg)

5702 lbs (2586.38 kg)

6484 lbs (2941.09 kg)

7258 lbs (3292.17 kg)

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Table 6. Minimum Allowable Bridle Leg Lengths with Varying Number of M3D Loudspeakers

5:1 Safety Factor 7:1 Safety Factor

Angle Between Bridle

Minimum Allowable

Bridle Leg Lengths

Angle Between Bridle

Minimum Allowable

Bridle Leg Lengths

Qty. of M3Ds

and Grid α (deg)

51˚

56˚

60˚

63˚

66˚

67˚

68˚

71˚

2.00 ft. (610 mm)

2.25 ft. (690 mm)

2.50 ft. (760 mm)

2.75 ft. (840 mm)

3.00 ft. (910 mm)

3.25 ft. (990 mm)

3.50 ft. (1070 mm)

3.75 ft. (1140 mm)

51˚

56˚

60˚

63˚

66˚

68˚

71˚

72˚

73˚

74˚

76˚

2.00 ft. (610 mm)

2.25 ft. (690 mm)

2.50 ft. (760 mm)

2.75 ft. (840 mm)

3.00 ft. (910 mm)

3.50 ft. (1070 mm)

3.75 ft. (1140 mm)

4.00 ft. (1220 mm)

4.25 ft. (1300 mm)

4.75 ft. (1450 mm)

5.00 ft. (1520 mm)

When calculating allowable lifting loads and bridle leg

lengths for the lifting condition illustrated in Figure 35, use

Table 5 and Table 6 to determine the maximum number of

M3Ds and allowed bridle leg lengths required to conform to

the appropriate safety factor for the venue.

The distance between lifting lugs in the conﬁguration shown

in Figure 35 is 29.35 inches (746 mm).

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Use Table 7 and Table 8 when the bridle legs are parallel to

the side of the M3D and when the rear pickup points are on

the closed MTG-3D Top Grid extension as shown in Figure

36.

CONFIGURATION C

Figure 36. Using bridle leg short side pickup points (BRP 2)

Table 7. Suspended Weight and Quantity of M3D Loudspeakers with Varying Bridle Leg Lengths

Angle

Between

Bridle

5:1 Safety Factor

Maximum

7:1 Safety Factor

Max

Maximum

Allowable Qty.

of M3Ds

Bridle Leg

Lengths

and Grid Top Grid

Maximum Allowable Allowable Qty. Maximum Allowable

α (deg)

Angle

±25˚

Suspended Weight

2259 lbs (1024.67kg)

3416 lbs (1549.47kg)

4438 lbs (2013.04 kg)

5402 lbs (2450.31 kg)

6335 lbs (2873.51 kg)

7248 lbs (3287.64 kg)

of M3Ds

Suspended Weight

1614 lbs (732.10 kg)

2440 lbs (1106.77 kg)

3170 lbs (1437.89 kg)

3859 lbs (1750.41 kg)

4525 lbs (2052.51 kg)

5177 lbs (2348.25 kg)

5820 lbs (2639.91 kg)

6457 lbs (2928.85 kg)

7089 lbs (3215.52 kg)

2.0ft.(610mm)

2.5ft.(760mm)

3.0ft.(910mm)

3.5ft.(1070mm)

4.0ft.(1220mm)

4.5ft.(1370mm)

5.0ft.(1520mm)

5.5ft.(1680mm)

6.0ft.(1830mm)

41˚

52˚

60˚

64˚

67˚

70˚

72˚

74˚

75˚

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Table 8. Minimum Allowable Bridle Leg Lengths with Varying Number of M3D Loudspeakers

5:1 Safety Factor 7:1 Safety Factor

Angle Between Bridle

Minimum Allowable

Bridle Leg Lengths

Angle Between Bridle

Minimum Allowable

Bridle Leg Lengths

Qty. of M3Ds

and Grid ∝ (deg)

43˚

47˚

52˚

56˚

60˚

62˚

64˚

65˚

67˚

69˚

70˚

2.25 ft. (690 mm)

2.50 ft. (760 mm)

2.75 ft. (840 mm)

3.00 ft. (910 mm)

3.25 ft. (990 mm)

3.50 ft. (1070 mm)

3.75 ft. (1140 mm)

4.00 ft. (1220 mm)

4.25 ft. (1300 mm)

4.50 ft. (1370 mm)

47˚

52˚

56˚

62˚

64˚

65˚

68˚

69˚

71˚

72˚

73˚

74˚

75˚

2.25 ft. (690 mm)

2.50 ft. (760 m)

2.75 ft. (840 m)

3.25 ft. (990 m)

3.50 ft. (1070 mm)

3.75 ft. (1140 mm)

4.25 ft. (1300 mm)

4.75 ft. (1450 mm)

5.00 ft. (1520 mm)

5.25 ft. (1600 mm)

5.75 ft. (1750 m)

6.00 ft. (1830 mm)

When calculating allowable lifting loads and bridle leg

lengths for the lifting condition illustrated in Figure 36, use

Table 7 and Table 8 to determine the maximum number

of M3Ds and the allowed bridle leg lengths required to

conform to the appropriate safety factor for the venue.

The distance between lifting lugs in the conﬁguration shown

in Figure 36 is 36 inches (914 mm).

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When using bridle legs spanning the short side of the M3D

(front to back) with the pickup attached to the extended

MTG-3D Top Grid pickup points as shown in Figure 37, use

Table 9 and Table 10 to determine the maximum number

of M3Ds and the allowed bridle leg lengths required to

conform to the appropriate safety factor for the venue.

CONFIGURATION D

Figure 37. Bridle legs using attachment points on an extended

MTG-3D Top Grid (BRP 3)

Table 9. Suspended Weight and Quantity of M3D Loudspeakers with Varying Bridle Leg Lengths

Angle

Between

Bridle

5:1 Safety Factor

7:1 Safety Factor

Maximum

Max

Maximum

Allowable Qty.

of M3Ds

Bridle Leg

Lengths

and Grid Top Grid Maximum Allowable

Maximum Allowable

Suspended Weight

Allowable Qty.

of M3Ds

α (deg)

Angle

±25˚

Suspended Weight

3102 lbs (1407.04 kg)

3818 lbs (1731.82 kg)

4494 lbs (2038.44 kg)

5145 lbs (2333.73 kg)

5780 lbs (2621.76 kg)

6404 lbs (2904.81 kg)

7019 lbs (3183.76 kg)

3.5ft.(107mm)

4.0ft.(122mm)

4.5ft.(137mm)

5.0ft.(152mm)

5.5ft.(168mm)

6.0ft.(183mm)

6.5ft.(198mm)

7.0ft.(213mm)

7.5ft.(229mm)

8.0ft.(244mm)

8.5ft.(259mm)

9.0ft.(274mm)

47˚

2216 lbs (1005.16 kg)

2727 lbs (1236.95 kg)

3210 lbs (1456.03 kg)

3675 lbs (1666.95 kg)

4129 lbs (1872.88 kg)

4574 lbs (2074.73 kg)

5014 lbs (2274.31 kg)

5449 lbs (2471.62 kg)

5880 lbs (2667.12 kg)

6309 lbs (2861.71 kg)

6736 lbs (3055.40 kg)

7160 lbs (3247.72 kg)

55˚

60˚

62˚

66˚

68˚

71˚

72˚

73˚

74˚

75˚

76˚

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Table 10. Minimum Allowable Bridle Leg Lengths with Varying Number of M3D Loudspeakers

5:1 Safety Factor 7:1 Safety Factor

Angle Between Bridle

Minimum Allowable

Bridle Leg Lengths

Angle Between Bridle

Minimum Allowable

Bridle Leg Lengths

Qty. of M3Ds

and Grid ∝ (deg)

43˚

3.25 ft. (990 mm)

3.50 ft. (1070 mm)

3.75 ft. (1140 mm)

4.00 ft. (1220 mm)

4.25 ft. (1300 mm)

4.50 ft. (1370 mm)

5.00 ft. (1520 mm)

5.25 ft. (1600 mm)

5.50 ft. (1680 mm)

5.75 ft. (1750 mm)

6.25 ft. (1910 mm)

6.50 ft. (1980 mm)

47°

47˚

51˚

57˚

60˚

62˚

66˚

70˚

71˚

72˚

73˚

74˚

75˚

76˚

3.50 ft (1070 mm)

3.50 ft. (1070 mm)

3.75 ft. (1140 mm)

4.25 ft. (1300 mm)

4.50 ft. (1370 mm)

5.00 ft. (1520 mm)

5.50 ft. (1680 mm)

6.25 ft. (1900 mm)

6.50 ft. (1980 mm)

7.00 ft. (2130 mm)

7.50 ft. (2290 mm)

7.75 ft. (2360 mm)

8.25 ft. (2510 mm)

8.75 ft. (2670 mm)

43˚

47˚

51˚

55˚

57˚

60˚

62˚

64˚

66˚

67˚

68˚

71˚

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The pickup conﬁguration using the center pickup points on

the MTG-3D is shown in Figure 38.

CONFIGURATION E

CAUTION: The MTG-3D Top Grid must

not rotate (tilt) more than 12 degrees from

horizontal.

Figure 38. Using center pickup points

Table 11. Suspended Weight and Quantity of M3D Loudspeakers

Angle

Between

Bridle

5:1 Safety Factor

7:1 Safety Factor

Bridle

Leg

Lengths

Max

Maximum

Allowable Qty.

of M3Ds

Maximum

Allowable

and Grid Top Grid

Maximum Allowable

Suspended Weight

Maximum Allowable

α (deg)

Angle

Suspended Weight

Qty. of M3Ds

N/A

±12˚

6404 lbs (2904.81 kg)

1 to 14

4574 lbs (2074.73 kg)

1 to 10

NOTE: Each motor must be rated to support

the total weight of the entire array.

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Each motor hook may be attached to the corner of the

MTG-3D Top Grid with two 5/8-inch or 3/4-inch shackles.

There is a maximum combination of 16 M3D and M3D-

Sub or other loudspeakers, such as MSL4s and CQs,

which can be underhung in this conﬁguration. The total

weight of the hung system cannot exceed the total

equivalent weight of 16 M3Ds.

CONFIGURATION F

When an array is lifted with a separate motor attached

to each of the MTG-3D corner lifting points, as shown in

Figure 39, an array of up to 16 M3Ds can be supported

(see Table 12).

NOTE: Each pair of motors must be rated to

support the total weight of the entire array.

BRP 1

BRP 2

BRP 3

Figure 39. Separate motor conﬁguration with the rear extension frame either retracted or extended

Table 12. Suspended Weight and Quantity of M3D Loudspeakers

Angle

Between

Bridle

5:1 Safety Factor

7:1 Safety Factor

Bridle

Leg

Lengths

Max

Maximum

Allowable

and Grid Top Grid

Maximum Allowable

Suspended Weight

Allowable Qty.

of M3Ds

Maximum Allowable

α (deg)

Angle

Suspended Weight

Qty. of M3Ds

N/A

±25˚

1 to 16

7089 lbs (3215 kg)

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CONFIGURATION G

NOTE: The lift mechanism must be rated to

In conﬁguration G, the steel cables are connected to a

single lift point from the four rigging points on the MTG-3D

Top Grid.

support the total weight of the entire array.

The array must have suitable tie-downs to eliminate sway

and twist.

The array is lifted from a single point attached to each of the

MTG-3D Top Grid corner lifting points as shown in Figure

40. An array of up to 16 M3Ds can be supported.

CAUTION: DO NOT use the MTG-3D Top

Grid in the extended position when an array

is hung from a single point as shown in

Figure 40.

The four-way bridle may be attached to each corner

of the MTG-3D Top Grid with four 5/8-inch or four 3/4-

inch shackles. The combined weight of the maximum

combination of M3Ds and M3D-Subs or other

loudspeakers, such as MSL-4s and CQs, which can be

under-hung in this conﬁguration, cannot exceed the total

equivalent weight of the allowable number of M3Ds as

shown in Table 13.

BRP 1

BRP 2

DO NOT use this hanging

conﬁguration (BRP 3)

Figure 40. Single point pickup conﬁguration

Table 13. Suspended Weight and Quantity of M3D Loudspeakers

Angle

Between

Bridle

and Grid

α (deg)

5:1 Safety Factor

7:1 Safety Factor

Max

Top

Grid

Angle

Maximum

Allowable Qty.

of M3Ds

Maximum

Bridle Leg

Lengths

Maximum Allowable

Suspended Weight

Maximum Allowable

Suspended Weight

Allowable

Qty. of M3Ds

3.25ft.(990mm)

43˚

±25˚

1 to 16

7089 lbs (3215 kg)

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APPENDIX B — PHYSICAL SPECIFICATIONS

M3D PHYSICAL SPECIFICATIONS

Enclosure

Finish

Multi-ply hardwood

Black textured (weather protected)

Note: Custom color available upon request

Powder-coated hex stamped steel

Protective grill

Rigging

QuickFly MRF-3D Rigging Frame with integral CamLinks, rear connecting bars, and captive

quick release pins

Weather protection

Dimensions

Weight

Standard

54" W x 20" H x 30.5" D (1372 mm x 508 mm x 775 mm)

Net: 415 lbs (188 kg)

20.00"

[508 mm]

10.00"

[254 mm]

9.56"

[243 mm]

8.50"

[216 mm]

WARNINGS:

THIS PRODUCT MUST BE GROUNDED

This surface may reach high tempuratures white in use.

To ensure proper operation, allow at least

inches

clearance from this surface and adequate ventilation.

To reduce the risk of electric shock do not remove cover.

No operator or serviceable parts inside.

To reduce the risk of fire or electric shock

do not expose this appliance to rain or moisture.

ATENCI”N:

AUTHORIZADO

…

ACHTUNG: GEH√USE NICHT OFFENE WARTUNG

UND REPARATUR NUR DURCH ELEKTROF√CHKRAFTE

30.50"

ATTENTION: ENTRETIENET REPARATIONS

INTERNES NE SONT AUTORISEES QU'AU

PERSONNEL TECHNIQUE QUALIFI…

U.K. WARNING:

NO OPERATOR SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED PERSONNEL.

95-125V

0-60Hz

1400W RMS MAX 1400W RMS MAX

208-235V~

-60Hz

Operational Voltage Range:

Turn on 85V~ Turn off 134V~

Turn on 165V~ Turn off 264V~

[775 mm]

51.00"

[1295 mm]

54.00"

[1372 mm]

Figure 41. M3D Loudspeaker physical dimensions

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M3D-SUB PHYSICAL SPECIFICATIONS

Enclosure

Finish

Multi-ply hardwood

Black textured (weather protected)

Note: Custom color available upon request

Powder-coated hex stamped steel

Protective grill

Rigging

QuickFly MRF-3D Rigging Frame with integral CamLinks, rear connecting bars, and

captive quick release pins

Weather protection

Dimensions

Weight

Standard

54" W x 20" H x 30.5" D (1372 mm x 508 mm x 775 mm)

Net: 395 lbs (179 kg)

20.00"

[508 mm]

10.00"

[254 mm]

9.56"

8.50"

[243 mm]

[215 mm]

WARNINGS:

THIS PRODUCT MUST BE GROUNDED

This surface may reach high tempuratures white in use.

To ensure proper operation, allow at least

inches

clearance from this surface and adequate ventilation.

To reduce the risk of electric shock do not remove cover

No operator or serviceable parts inside.

To reduce the risk of fire or electric shock

do not expose this appliance to rain or moisture.

ATENCI”N:

AUTHORIZADO

…

ACHTUNG: GEH√USE NICHT OFFENE WARTUNG

UND REPARATUR NUR DURCH ELEKTROF√CHKRAFTE

30.50"

ATTENTION: ENTRETIENET REPARATIONS

INTERNES NE SONT AUTORISEES QU'AU

PERSONNEL TECHNIQUE QUALIFI…

U.K. WARNING:

NO OPERATOR SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED PERSONNEL.

95-125V

-60Hz

1400W RMS MAX 1400W RMS MAX

208-235V~

50-60Hz

Operational Voltage Range:

Turn on 85V~ Turn off 134V~

Turn on 165V~ Turn off 264V~

[775 mm]

51.00"

[1295 mm]

54.00"

[1372 mm]

Figure 42. M3D-Sub Directional Subwoofer physical dimensions

MTG-3D TOP GRID PHYSICAL SPECIFICATIONS

Finish

Black powder coated

Dimensions

Width: 55.60" (1412 mm)

Height: 14.54" (369 mm)

Depth with extension in extended position: 50.70" (1288 mm)

Depth with extension in closed position: 37.43" (951 mm)

308 lbs (139.71 kg)

Weight

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Figure 43. MTG-3D Top Grid physical dimensions

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4. The adjustable link rear link assemblies include a short

link plate, hammer-lok, and chain.

5. The 2.5-inch QRPs are used for holding the chain to the

transition frame.

6. Oval handle hitch pins are used for holding the

loudspeakers to the transition frame.

APPENDIX C — MTF-3D TRANSITION

FRAME ASSEMBLY PROCEDURE

Use the following procedure when transitioning in an array

from M3Ds to Meyer Sound MSL-4s or CQs (see Figure 44).

7. The lynch pins are used with the oval handle hitch pins.

ATTACHING LOUDSPEAKERS TO TRANSITION

FRAME

This procedure can be completed with two stagehands, but

is most efﬁcient with three.

1. Position loudspeakers at their approximate desired

horizontal splay angle.

2. Prop up all rings and stud rigging rings to their upright

position and parallel with the corresponding frame

holes.

3. Place the rear arm across the top of the loudspeakers

— on the inside of the rigging points — ﬂanges up.

Note the appropriate slots in the rear arm for the

loudspeakers and the desired splay angle:

Figure 44. Transition frame with downﬁll loudspeakers

— Rectangles denote MSL-4s

— Circles denote CQs.

MTF-3D TRANSITION FRAME

Each MTF-3D Transition Frame comprises the items shown

in Table 14.

The number inside of the shapes denotes the horizontal

splay angle.

4. Position the rear arm over the rigging rings so that the

rings slide up through the slots. Some repositioning

may be necessary to align the rigging rings and slots.

Table 14. MTF-3D Transition Frame

Qty Description

Part Number

61.105.113.01

61.105.114.01

61.105.125.01

61.105.115.01

134.007

5. Slide the oval handle hitch pins from the rear, across

the top of the rear arm and through the rigging rings

(and vertical rib or the arm itself) until the hitch pin collar

stops against the side of the rear arm.

Front arm¹

Rear arm²

Adjustable link front link assembly³

Adjustable link rear link assembly⁴

2.5" quick release pin (QRP)⁵

Oval handle hitch pin⁶

Lynch pin⁷

6. Insert a lynch pin into the hole in the oval handle hitch

pin. This will lock the pin into place so that it cannot be

removed.

7. Follow the same steps (steps 1 through 6 above) to

attach the front arm.

134.014

124.060

Table Footnotes

1. The front arm is the larger arm

2. The rear arm is the smaller arm

3. The adjustable link front link assemblies include a long

link plate, hammer-lok, and chain.

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ATTACHING THE ADJUSTABLE LINK ASSEMBLY

TO THE MRF-3D RIGGING FRAMES

TIP: When you are lowering the front arm on

to the rings, it is easiest to do so from one

side — gradually lowering it to the other side

as the rings each ﬁt into the corresponding

holes in the arm. Once the ﬁrst ring is

positioned into the ﬁrst slot, insert the hitch

pin to anchor the front arm. This will simplify

the insertion of the other ﬁve hitch pins. The

hitch pins should be inserted from the rear of

the cabinet toward the front, as with the rear

arm.

Rear

1. Slide the rear (short) adjustable link plate up (vertically)

inside the rear tube of the MRF-3D.

Figure 45. Pinning rear adjustable link plate

4. Lower the M3D array over the CQ assembly transition

frame and leave approximately 1 inch (25 mm) of

clearance between the bottom edge of the lowest M3D

and the front arm of the transition frame.

2. Align the lowest hole in the adjustable link plate with the

lower hole in the MRF-3D. Each hole in the adjustable

link corresponds with two degrees of vertical splay

angle.

5. Release the QRP in the top of the rear adjustable link,

allowing the bottom of the chain assembly to align as

follows:

3. Slide the QRP through the lower hole, through the

adjustable link plate, and then through the hole on the

other side (see Figure 45). Make sure the QRP is seated

all the way in and locked into place.

— For 30˚ splay MSL-4s: The front-most hole in the rear

Transition Frame arm

— For 22.5˚ splay MSL-4s: The next to front-most hole

in the rear Transition Frame arm

— For CQs: The rear-most hole in the rear Transition

Frame arm

Slide the QRP through the transition frame hole selected in

step 5, the lowest chain link, and then through the transition

frame hole on the other side. Make sure the pin is seated all

the way in and locked into place.

Repin the top of the rear adjustable link in the highest hole

possible without lifting the rear of the MSL-4 cabinets. For

most applications, this will be the 2˚ hole.

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2. Remove the QRP holding the CamLink in place. The

CamLink should swing down freely.

Front

1. Raise the M3D array to give sufﬁcient space to slide

the front (long) adjustable link plate up (vertically) in

between the MRF-3D Rigging Frame and the CamLink,

and use the same hole that is used to adjust the

CamLink (see Figure 46).

3. Slide the adjustable link plate up between the CamLink

and MRF-3D, aligning the weldment hole with the

appropriate hole in the adjustable link plate. The setting

should result in a net (relative to the bottom M3D)

downtilt of 5˚ (i.e., if the rear hole is pinned at 2˚, then

the front hole will be pinned at 7˚).

4. Insert the QRP through the MRF-3D hole just far

enough in to temporarily hold the adjustable link plate in

place.

5. Rotate the CamLink back up again, and then fully insert

the QRP through the CamLink and through the opposite

side of the MRF-3D. Make sure the pin is seated all the

way in and locked into place.

6. Place the bottom link of the chain in between the two

vertical ﬂanges on the front arm.

7. Align the link with the holes in the ﬂanges and insert a

QRP through one ﬂange, through the link, and through

the other ﬂange. Make sure the pin is seated all the way

in and locked into place.

Figure 46. Pinning front adjustable link plate

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GLOSSARY

array

A group of ﬂown loudspeakers that has been conﬁgured to produce optimum sound pressure level

(SPL) and coverage in a particular venue.

block

bridle

A group of loudspeakers from an array that has been broken down into convenient-sized groups for

transport.

A method of using two steel cables connected to two lifting points on an array’s top grid, brought

together to a common point and attached to a lifting motor.

bridle leg

BRP

One side of a bridle.

Back rigging point. This is a back pickup point on the MTG-3D Top Grid to which a bridle leg is

attached.

CamLink

A Meyer Sound feature that allows quick, positive, and accurate setting of splay angles in an array.

chain bag or bucket A place where the chain from lift motors is stored as the chain moves through the lift motor.

dead hang

A lifting conﬁguration where the lifting motors are connected directly to the lifting points on the MTD-

3D Top Grid without the use of a bridle.

dynamic load

The changing weight of an array when the rigging motors are in motion, which includes the static

weight and other factors such as acceleration, bounce, and startup forces.

ﬂy

FOH

The process of lifting an array into position in a venue.

Front-of-house

front-to-back

A lifting conﬁguration where the lifting motors are attached to bridles connected to the front lifting

and rear lifting points on the MTD-3D Top Grid.

in or incoming

Rigging term used to denote hardware moving in a downward direction.

laser level

lift point

A device used by audio technicians to determine an array’s site angle during setup or at ﬁnal trim

position. It also has readout illumination and can be set to relative angles.

That point on an array that has been designed and certiﬁed to ﬂy an approved array conﬁguration

with the appropriate safety factor (see rigging point).

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out

Rigging term denoting hardware moving in an upward direction.

pullback or

pullback motor

Rigging term used to describe the process of attaching rope, a sling, or a pullback motor to the

bottom rear of an array to achieve further downtilt than is available using the array’s center of gravity

alone.

QRP

Quick Release Pin, 0.5" x 2." (13 mm x 64 mm), used in all M3D rigging points.

rigging point

Sometimes referred to as a lift point. This is the point on an array’s MTG-3D Top Grid where a lifting

motor can be connected. These points have been designed and certiﬁed to lift an approved array

conﬁguration. Rigging point is also used to refer to the position in the venue where a motor will be

suspended from the venue structural steel.

SPL

splay

Sound pressure level. This is a measurement of the sound energy measured at a speciﬁc location in

a venue.

The angle between the bottom of a loudspeaker in an array and the top of the next loudspeaker in

the array.

static load

A rigging term that describes the actual weight of an array when it is not in motion

top grid

transition frame

trim

A Meyer Sound MTG-3D Top Grid is a rigging element that provides a certiﬁed means of transitioning

between lifting motors to the top loudspeaker of an array.

A Meyer Sound rigging element that provides a certiﬁed means of transitioning between different

Meyer Sound loudspeaker types within an array.

Also referred to as trimmed position or trim height to mean the ﬁnal position of the array after setup.

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Meyer Sound Laboratories Inc.

2832 San Pablo Avenue

Berkeley, CA 94702

USA

T: +1 510 486.1166

F: +1 510 486.8356

[email protected]

www.meyersound.com

Meyer Sound Laboratories Inc.

05.105.400.01 Rev. B

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