Presonus Audio electronic Stereo Amplifier DigiMAX LT User Manual

DigiMAX LT

Eight-Channel Mic-Preampliﬁer with

adat™ Lightpipe Output

USER’S MANUAL 1.0

PAD

SAMPLE

RATE

EXT

CLOCK

POWER

+48V

32k 44.1k 48k

GAIN

115/230 VAC

(by internal

jumpers)

WORD CLOCK

POWER

CHANNEL

20WATTS

CREATED,

DESIGNED

AND

MANUFACTURED

IN THE USA

OUT

CHANNEL INSERT POINTS

adat™

optical

interface

DIGITAL

AUDIO

OUTPUT

MICROPHONE

XLR

MICROPHONE

LINE INPUT

XLR

MICROPHONE

LINE INPUT

XLR

MICROPHONE

XLR

MICROPHONE

LINE INPUT

XLR

MICROPHONE

LINE INPUT

XLR

MICROPHONE

XLR

MICROPHONE

- XLR

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

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OVERVIEW 1

1.1 INTRODUCTION

Thank you for purchasing the PreSonus DigiMAX LT Eight-Channel Mic-Preampli-

ﬁer with adat™ Lightpipe Output. This preamp was designed using state of the

art components to deliver crystal clear audio for an indeﬁnite period of time. We

believe the DigiMAX LT to be an exceptional sounding unit and an exceptional

value.

Please contact us at 1-800-750-0323 with your questions or comments regard-

ing this product. PreSonus Audio Electronics, Inc. is committed to constant

product improvement and believes the best way to accomplish this task is by

listening to the experts on our gear, our valued customers. We appreciate the

support you have shown us through the purchase of this product.

Please pay close attention to how you connect your DigiMAX LT to your system.

Improper grounding is the most common cause of noise problems found in

studio or live sound systems. We urge you to scan this manual before hooking

up your DigiMAX LT to familiarize yourself with its features and applications.

Good luck and enjoy your DigiMAX LT!

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1 OVERVIEW

1.2 FEATURES

Dual Servo Mic Preamps

Each channel of your DigiMAX LT provides ultra low noise and wide gain control

allowing the user to boost a desirable signal without increasing unwanted

background noise.

48V Phantom Power

Each channel of the DigiMAX LT has 48V of phantom power available. When the

phantom power switch is engaged, power is supplied at a constant rate. This

assures optimum performance of your condenser microphone(s) and that it will

be free of distortion associated with insufﬁcient power. This switch is located on

the front panel next to each gain knob.

-20dB Pad

A -20dB pad is available on each channel of the DigiMAX LT for reducing

incoming signal levels. Using this pad can provide a more manageable signal

from high output devices giving the operator greater control over the incoming

signal and a much reduced chance of over-driving the input, thereby avoiding

distortion.

Neutrik™ Combo Connectors

Each channel of the DigiMAX LT has a mic/line connector using the Neutrik™

combo connector. This revolutionary style connector lets you use either ꢀ” or

XLR connectors in the same input.

Sample Rate Selector

The DigiMAX LT has a switch on the front panel that lets the operator choose

the sample rate. It provides selectable rates of 32k, 44.1k and 48k.

Ext Clock

When the External clock switch is engaged the DigiMAX LT goes into ‘chase’

mode and automatically recognizes which of the three sampling rates is

required for optimum synchronization.

Digital Optical Output

The DigiMAX LT has an adat™ (lightpipe) output that can be used with any com-

mercially available digital optical cable. This cable can supply eight simultaneous

outputs.

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CONTROLS AND CONNECTIONS 2

2.1 FRONT PANEL

-20 -10 CLIP

PAD

SAMPLE

RATE

EXT

CLOCK

POWER

+48V

32k 44.1k 48k

GAIN

Notice that the front panel is divided into eight preampliﬁer sections, sample

rate selector with indicators and external clock switch.

+48V

A switch labeled +48V is located next to each gain knob.

This switch may be engaged to provide phantom power for

condensor mics and any other device which may require

phantom power by way of the XLR input. This power is

supplied at a constant rate to allow use of all eight inputs

simultaneously, without any degradation of audio quality.

Pin 1 = GND, Pin 2 = +48V, Pin 3 = +48V

Gain Control

This knob provides 44dB of gain to the processed signal. The ampliﬁer has

inherent gain of 10dB thus delivering a total gain possibility of 54dB.

-20dB Pad

A -20dB pad is available on each channel of the DigiMAX LT for reducing

incoming signal levels. Using this pad can provide a more manageable signal

from high output devices giving the operator greater control over the incoming

signal and a much reduced chance of over-driving the input, thereby avoiding

distortion.

The pad is available only for the XLR input on each channel. The pad does not

work for the line level inputs.

Channel LEDs

The three LEDs found on each channel are provided to serve different functions:

-20dBu - The LED farthest to the left is labeled -20 and serves to monitor

whether or not signal is present at the channel output.

-10dBu - The LED in the middle is labeled -10 and indicates a signal level

of -10dBU

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CONTROLS & CONNECTIONS 2

Clip - The LED labeled CLIP indicates at a signal level of +22dB. Care should be

taken to avoid using signal levels that cause this LED to become active. Signal

levels that reach or exceed this amount of output will cause undesirable artifacts

(distortion) in the channel output signal that is being indicated by this LED. The

signal level is reduced by rotating the channel’s control counter-clockwise.

Sample Rate Selector

The section at the extreme right of the front panel contains the sample rate

selector switch with LED indicators provided for 32k, 44.1k and 48k. This

section also contains a switch labeled EXT. CLOCK. When this switch is engaged

the operating clock rate of 32k, 44.1, or 48k will be determined by the incom-

ing signal from an external device through the word clock in input on the back

panel of the DigiMAX LT.

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CONTROLS & CONNECTIONS 2

2.2 BACK PANEL BASIC LAYOUT

115/230 VAC

(by internal

jumpers)

WORD CLOCK

POWER

CHANNEL

20WATTS

CREATED,

DESIGNED

AND

MANUFACTURED

IN THE USA

OUT

CHANNEL INSERT POINTS

adat™

optical

interface

DIGITAL

AUDIO

OUTPUT

MICROPHONE

XLR

MICROPHONE

XLR

MICROPHONE

XLR

MICROPHONE

XLR

MICROPHONE

XLR

MICROPHONE

XLR

MICROPHONE

XLR

MICROPHONE

- XLR

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

TRS

LINE INPUT

Digital Optical Output

An adat™ optical output (lightpipe) is provided on the rear panel of the DigiMAX

LT. Eight simultaneous 24bit outputs are possible when using the optical out.

Word Clock Out/In

The word clock output and input are accessed through separate BNC con-

nectors. The internal sample rate can be set to send 32k, 44.1k, or 48k. The

word clock in scans the incoming information and automatically synchs to the

necessary sample rate.

Insert

Each channel of the DigiMAX LT has an insert that sends and returns the signal

from the associated channel. This insert can be very useful for dynamics

processing (such as compressing, limiting, etc.) or for monitoring purposes by

helping in overcoming the time discrepancy that may be encountered in some

digital recording situations. For more detailed instructions on uses and wiring

of the inserts please see the application guide at the end of the manual. This

insert is wired as follows:

Tip

Sleeve

Ring

Tip

TIP = Send

RING = Return

SLEEVE = GND

Ring

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3 OPERATIONS

3.1 DYNAMIC MICROPHONES

Dynamic microphones are characterized by lower output levels. Hence, more

gain is needed to amplify a dynamic microphone to operating level. Occasionally

it is necessary to add the -20dB pad to the microphone to avoid distortion (e.g.

when recording percussion).

Do not use phantom power when using dynamic microphones.

3.2 PHANTOM POWERED MICROPHONES

Phantom powered microphones such as condenser and some ribbon micro-

phones require external power to preamplify the microphone acoustic pickup.

These microphones typically have much higher output than dynamic micro-

phones. Hence the -20dB pad is almost always necessary when close micing to

avoid clipping the ampliﬁer.

3.3 LINE LEVEL INPUTS

The ꢀ” inputs on the DigiMAX LT are designed for use with line level or low

impedance inputs not instrument level inputs. These inputs will work for line

level devices such as keyboards, samplers, drum machines, CD players, etc.

3.4 APPLICATION GUIDE

Outboard Dynamics Processing Example

The DigiMAX LT has an insert on every channel that allows you to insert your

own dynamics processor, such as a compressor, EQ, limiter, or etc. To do this,

all you need is your dynamics processor and a TRS insert cable. This cable is Y-

shaped, has a single TRS ꢀ” jack on one end and two ꢀ” TS jacks on the other

end. The single end will look like a stereo ꢀ” connector jack. This end of the

cable plugs into the insert jack on the back of the DigiMAX LT. The other ends

of the cable plug into the input and output of the outboard unit. If the outboard

unit does not work immediately, you may want to try swapping the jacks that

are plugged into the input and output of the outboard unit.

Insert Jacks As Analog Outputs Example 1

You may have noticed by now that the DigiMAX LT does

not have a standard analog output. In the event that you

want to have analog outputs as well as the lightpipe output,

you can use the inserts as analog outputs. To do this, all

you need is a ꢀ” TS cable. Plug the cable in until you feel

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OPERATIONS 3

it ‘click’ once. The cable will appear to be ‘half plugged in’. Using the insert in

this fashion will not break the signal chain and will allow the lightpipe output to

function correctly.

Insert Jack As Analog Outputs Example 2

In the event that you do not need the lightpipe output, you can use the inserts

as analog outputs. To do this, all you need is a TRS insert cable. This cable is

Y-shaped, has a single TRS ꢀ” jack on one end and two ꢀ” TS jacks on the

other end. The single end will look like a stereo ꢀ” connector. This end of the

cable plugs into the insert jack above the input on the back of the DigiMAX LT.

You would use the SEND end of the cable as the output cable.

By using the insert as an analog output with an insert cable, you will not be

able to pass a signal through to the adat™ (lightpipe) output. The reason for

this is that a signal is sent to a piece of outboard gear from the insert jack and

then returned to the insert after being processed. So, in other words you are

breaking the signal chain by using the send and not the return.

Using The DigiMAX LT As A Front End For Digital Recording Systems

The DigiMAX LT is the perfect front end for a digital recording system. The pre-

amps on the unit allow you to boost the signal going to your recorder without

adding extra, unwanted, noise. All digital recorders require that word clock be

transmitted with a digital audio signal to ensure sample accuracy and syn-

chronization. Word clock scans incoming information and automatically synchs

to the necessary sample rate. In other words, word clock ensures that the

recorder and the sending device (in this case the DigiMAX LT) send and receive

digital audio at the same rate. If there is no word clock synch then you will hear

pops, clicks, or weird digital dropout noise. Word clock can either be transmit-

ted through the lightpipe cable (ﬁber-optic) or by BNC cable. If the DigiMAX

LT is the master (sending word clock out to the recorder), then there are two

possible connection scenarios. Both cases require that the EXT CLOCK button

on the front of the unit be depressed (not pushed in) and that the appropriate

sample rate be selected by using the SAMPLE RATE button on the front of the

unit. The ﬁrst case in which the DigiMAX LT is the master would require that the

word clock output of the DigiMAX LT be connected to the word clock input of the

recorder by BNC cable. The second case in which the DigiMAX LT is the master

would require that the recorder receive word clock from the adat™ lightpipe

ﬁber-optic cable. This second scenario requires that the digital recorder be set

to receive word clock via lightpipe. This is often done by either hitting a button

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3 OPERATIONS

on the recorder that says external clock or by setting a drop down menu option

to receive sync from an external source or lightpipe.

In the event that you want to slave the DigiMAX LT to another device you would

need to do two things. First, press the EXT CLOCK button on the front of the

unit. Second, you would hook a BNC cable from the word clock output of the

sending device to the word clock input on the back of the DigiMAX LT.

Bypassing The DigiMAX LT Preamps

The DigiMAX LT can be used as an analog to digital converter. The setup for this

application requires a TRS insert cable. This cable is Y-shaped, has a single TRS

ꢀ” jack on one end and two ꢀ” TS jacks on the other end. The single end will

look like a stereo ꢀ” connector. This end of the cable plugs into the insert jack

on the back of the DigiMAX LT. You would use the return end of the cable as the

input cable. By plugging a device into the return cable, you would be entering

the signal chain after the preamp. This would allow you to digitize a signal (such

as a keyboard or CD player) without passing through the DigiMAX LT preamp.

The DigiMAX LT is not designed for direct use with record players - An RIAA

(Recording Industry of America Association) phono preampliﬁer would have to

be inserted in between the record player and the DigiMAX LT. If this RIAA phono

preampliﬁer is not used then you would not hear an accurate representation of

the recording.

The DigiMAX LT is designed for use with line level or low impedance inputs NOT

instrument level inputs - The 1/4” inputs on the DigiMAX LT are lower imped-

ance than our typical instrument inputs. In other words, if you were to plug a

guitar into the DigiMAX LT directly, you probably wouldnít hear anything. Use of

an impedance matching direct box will provide the correct impedance for instru-

ments (ex: guitar, bass, etc.). However, you can plug microphones (dynamic or

condenser), keyboards, samplers, drum machines, CD Players and etc. into the

DIGIMAX LT.

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OPERATIONS 3

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4 TECHNICAL SPECIFICATIONS

Number of Channels ................................................................................ 8

Input

Input Impedance, XLR Input............................................................. 1.3k Ω

Input Impedance, Line Level Input...................................................... 10k Ω

Connectors ...................................................................... Neutrik™ Combo

Panel Controls

Gain .................................................................................... 0dB to +40dB

Pad................................................................................................. -20dB

Phantom Power................................................................................. +48V

Meters

Signal Present LED ..........................................................................-20dBu

Signal Level LED..............................................................................-10dBu

Clip LED .......................................................................................+22dBu

Output

adat™ Lightpipe Digital Optical.............................................................24bit

Insert (TRS)

Send (Unbalanced)....................................................................... 51 Ohms

Return (Unbalanced)..................................................................... 10 Ohms

Digital

Sampling Rates........................................................ 32kHz, 44.1kHz, 48kHz

Performance

Headroom .....................................................................................+22dBu

Freq. Response ...................................................... 20Hz - 50kHz (+/- .5dB)

THD + Noise (Unweighted) ............................................................<0.009%

Noise Floor .....................................................................................-94dBu

Signal to Noise................................................................................ >98dB

Analog Dynamic Range....................................................................>120dB

Power Supply Rejection.................................................................... >98dB

Ampliﬁer Type............................................................................Dual Servo

Power Supply

Type ...................................................................................Linear, Internal

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TECHNICAL SPECIFICATIONS 4

Input...........................................100/120/220/240VAC (Factory Conﬁgured)

Power ..........................................................................................80 Watts

Physical

Size..............................................................................................1U Rack

Dimensions........................................................................19” X 1.75” X 9”

Weight........................................................................................... 15 lbs.

Chassis .............................................................................................Steel

Panel .........................................................................................Aluminum

As a commitment to constant improvement, PreSonus reserves the right to change any

speciﬁcation stated herein at any time in the future without prior notiﬁcation.

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5 PRESONUS LIMITED WARRANTY

IN THE UNITED STATES

PreSonus Audio Electronics Inc. warrants this product to be free of defects in material

and workmanship for a period of one year from the date of original retail purchase.

This warranty is enforceable only by the original retail purchaser. To be protected by this

warranty, the purchaser must complete and return the enclosed warranty card within 14

days of purchase. During the warranty period PreSonus shall, at its sole and absolute

option, to either repair or replace, free of charge, any product that proves to be defective

on inspection by PreSonus or its authorized service representative. To obtain warranty

service, the purchaser must ﬁrst call or write PreSonus at the address and telephone

number printed below to obtain a Return Authorization Number and instructions of where

to return the unit for service. All inquiries must be accompanied by a description of

the problem. All authorized returns must be sent to the PreSonus repair facility postage

prepaid, insured and properly packaged. PreSonus reserves the right to update any unit

returned for repair. PreSonus reserves the right to change or improve the design of the

product at any time without prior notice. This warranty does not cover claims for damage

due to abuse, neglect, alteration or attempted repair by unauthorized personnel, and is

limited to failures arising during normal use that are due to defects in material or workman-

ship in the product. Any implied warranties, including implied warranties of merchantability

and ﬁtness for a particular purpose, are limited in duration to the length of this limited

warranty. Some states do not allow limitations on how long an implied warranty lasts,

so the above limitation may not apply to you. In no event will PreSonus be liable for

incidental, consequential or other damages resulting from the breach of any express or

implied warranty, including, among other things, damage to property, damage based on

inconvenience or on loss of use of the product, and, to the extent permitted by law,

damages for personal injury. Some states do not allow the exclusion of limitation of

incidental or consequential damages, so the above limitation or exclusion may not apply

to you. This warranty gives you speciﬁc legal rights, and you may also have other rights,

which vary form state to state. This warranty only applies to products sold and used in

the United States of America. For warranty information in all other countries please refer

to your local distributor.

PreSonus Audio Electronics, Inc.

7257 Florida Blvd.

Baton Rouge, LA 70806

(225) 216-7887

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PRESONUS LIMITED WARRANTY 5

OUTSIDE OF THE UNITED STATES

PreSonus Audio Electronics products are warranted only in the country where originally

purchased, through the authorized PreSonus distributor in the country of original purchase,

against defects in material and workmanship. The speciﬁc period of this limited warranty

shall be that which is described to the original retail purchaser by the authorized PreSonus

dealer or distributor at the time of purchase. PreSonus does not, however, warrant its

products against any and all defects: 1) arising Out of materials or workmanship not

provided or furnished by PreSonus, or 2) resulting from abnormal use of the product or use

in violation of instructions, or 3) in products repaired or serviced by other than authorized

PreSonus repair facilities, or 4) in products with removed or defaced serial numbers, or 5)

in components or parts or products expressly warranted by another manufacturer. PreSo-

nus agrees, through the applicable authorized distributor in the country of original retail

purchase, to repair or replace defects covered by this limited warranty with parts or prod-

ucts of original or improved design, at its option in each respect, if the defective product

is shipped prior to the end of the warranty period to the designated authorized PreSonus

warranty repair facility in the country where purchased, or to the PreSonus factory in the

U.S., in the original packaging or a replacement supplied by PreSonus, with all transporta-

tion cost and full insurance paid each way by the purchaser or owner. All remedies and the

measure of damages are limited to the above services. It is possible that economic loss or

injury to person or property may result from the failure of the product; However, even if

PreSonus has been advised of this possibility, this limited warranty does not cover any such

consequential or incidental damages. Some states or countries do not allow the limitations

or exclusion of incidental or consequential damages, so the above limitation may not apply

to you. Any and all warranties, express or implied, arising by law, course of dealing, course

of performance, usage of trade, or otherwise, including but not limited to implied warran-

ties of merchantability and ﬁtness for a particular purpose, are limited to a period of one

year from either the date of original retail purchase or, in the event no proof of purchase

date is available, the date of manufacture. Some states or countries do not allow limitations

on how long an implied warranty last, so the above limitations may not apply to you. This

limited warranty gives you speciﬁc legal rights, and you may also have other rights which

vary from state to state, country to country.

PreSonus Audio Electronics, Inc.

7257 Florida St.

Baton Rouge, LA 70806

(225) 216-7887

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