Samson Musical Instrument D2500 User Guide

DIGITAL DUAL 31 BAND EQUALIZATION SYSTEM

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Table of Contents

Introduction

D2500 Features

Controls and Functions

Front Panel Layout

Rear Panel Layout

D2500 Quick Start

SETTING UP THE D2500 to work in MANUAL mode

Operating the D2500

Navigating the D2500 Controls

GLobal

Selecting the Input

Selecting the Filter Bandwidth

Selecting the Fader Range

Selecting the Operating Mode

Using the Left, Right and Link Control Switches

Using the LINK switch

19 - 23

24 - 26

Controlling the Right Channel signal

Using the D2500 in MANUAL Mode

Working with the D2500 Faders

Using the Process Switches

Using the EQ section

Using the FEEDBACK Management Function

Using the Internal Noise GATE

Using the Internal DELAY

Setting up and Using the High Pass and Low Pass Filters

Using the Internal LIMITER for Basic Speaker Protection

Using the A/B Feature

Storing Programs in the D2500

Loading Programs in the D2500

Using the Load MASK function

MIDI and D Net

Setting the D2500 to Transmit and Receive MIDI

Setting the D2500 to Transmit and Receive Data Using D-Net

Selecting a MIDI Channel

Selecting MIDI Omni mode

Selecting MIDI Program Change

Operating the D2500 with the D1500 RTA

System Configurations

Using the D2500 with Active Speakers

Using the D2500 with Passive Speakers

Using the D2500 in Insert Points

Using the D2500 for Mains and Monitors

Using Two D2500’s for Mains and Monitors

D2500 Wiring Guide

Specifications

Printed September, 2005 v1.2

Samson Technologies Corp.

575 Underhill Blvd.

O. Box 9031

Syosset, NY 11791-9031

Phone: 1-800-3-SAMSON (1-800-372-6766)

Fax: 516-364-3888

www.samsontech.com

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Introduction

Congratulations! You just purchased one of the most innovative and useful audio tools available to sound engineers

today, the D2500 Digital Equalizer from Samson Audio! The D2500 is a dual channel, 1/3 Octave, 31 Band Digital Graphic

Equalizer featuring cutting edge DSP and analog-to-digital conversion technology, together with a simple to use, tra-

ditional analog user interface. The D2500’s robust, 2 rack-space steel and aluminum extruded chassis design is not only

road worthy, but it also provides a large front panel layout which is extremely easy to use and already familiar to audio

engineers. The beauty of the D2500 Graphic Equalizer is that it has 31 bands of real hands-on faders! You may forget that

that you are using a digital EQ; just press the MANUAL button and “ look mom, I’m equalizing the system!” And, with the

high-end 24 Bit AD and DA converters and 96K sampling rate, you’ll enjoy pristine audio quality. Thanks to the powerful

DSP engine and clever software, the D2500 is capable of producing EQ curves with more accurate and precise filters, far

exceeding the capabilities of even the best analog equalizers. What you won’t get is the accumulating additive hiss noise

that you get from an analog equalizer when you push up the high frequency bands.

In addition to being a simple to use digital equalizer, the D2500 is packed with all the goodies including HIGH & LOW

PASS FILTER, NOISE GATE, LIMITER, ENHANCER, DELAY and FEED BACK MANAGEMENT. All these digital effects are pro-

grammable and their associated parameters can be stored, and recalled, as part of the 99 available user pre-sets. The

HIGH and LOW PASS FILTERS allow you to quickly apply an EQ contour for rolling off the high and low end frequencies,

for example, when equalizing vocal monitors. The D2500’s NOISE GATE allows you to set a threshold level in order to

mute any system hums and buzzes during silent sections keeping your system super clean. With the D2500’s LIMTER you

can control the level that you are sending to your power amplifiers to help you insure good protection for your loud-

speakers. The onboard ENHANCER will actually add high frequency to the system when there is program material at

those frequencies, adding extra sparkle to the mix. The ENHANCER will also automatically turn down the high frequen-

cies when there is no high frequency signal content, which, by eliminating system noise and hiss, making the D2500 a

very effective noise reduction system. In addition, the D2500 also offers on onboard DELAY for time aligning speakers.

Another powerful feature of the D2500 is feedback suppression. The D2500’s feedback management system can be set

to AUTO which will automatically find the frequency that’s feeding back and lower the associated filter. Or, you can use

the feedback management system in MANUAL mode where the D2500 will automatically find, and then display, the

frequency that’s feeding back, showing which fader you should pull down manually. All settings and parameters for the

equalizer and digital effects can be stored in 99 pre-set locations. Using the large, easy to read, LCD display and conve-

nient data wheel, it’s possible to save your favorite equalization curves and recall them in the future. Or, when using the

D2500 together with the D 1500 Real Time Analyzer, you can auto-correct the room to a flat response, and then apply

your favorite system curve on top. In addition, the powerful LOAD MASK allows you to recall certain effects or EQ curves

from any preset independently, so you can add pre-set effects settings with real time changes.

The D2500 features standard MIDI implementation and Samson’s D-Net, enabling device-to-device linking for creating

larger audio systems, for interfacing to a personal computer. When linking the units you see the full power of the D-class

system. With a basic MIDI connection, the fader positions of the D-2500 digital EQ can be displayed the D1500 Real Time

Analyzer, giving you the power of digital processing with a unique analog feel. For systems using many D class units,

the D2500 can be fitted with the DN1 D-Net network card. Samson’s D Net is a high-speed communication protocol for

connected multiple D class units, like the D2500 digital equalizer, D1500 RTA or D3500 feedback management system.

In addition to being 10 times faster than MIDI, the error rate is so close to zero, it’s difficult to measure. All settings and

parameters can be stored in any of the 99 preset locations providing instant recall of your favorite setups. Like all D class

models, the D2500 features an advanced 32-bit point floating processor DSP interface to high quality converters with 24-

bit audio resolution and sample rates up to 96kHz for pristine audio quality. You can even upgrade your D class units to

premium Analog-to-Digital and Digital-to-Analog I/O (Input/Output) converter boards, keeping your D class system up

to date with the best technology and sound, far into the future.

The D2500 is perfectly at home in the studio or on the road. The fact is, you would use the D2500 equalizer for its precise

filtering and superb audio quality alone, but you get the power of all the features, and then some, expected from a high

quality digital equalizer. Whether you are a recording or a live sound engineer you’ll get a better sound using the D2500

Digital Equalizer!

Although this product is designed for easy operation, we suggest you take some time out first to go through these pages

so you can fully understand how we’ve implemented a number of unique features. In this manual, you’ll find a more

detailed description of the features of the D2500, as well as a guided tour through the front and rear panels, step-by-step

instructions for using the unit and suggested applications set-ups.

Serial number:_____________________________________ Date of purchase:_________________________________

Should your unit ever require servicing, a Return Authorization number (RA) must be obtained before shipping your unit

to Samson. Without this number, the unit will not be accepted. Please call Samson at 1-800-3SAMSON (1-800-372-6766)

for a Return Authorization number prior to shipping your unit. Please retain the original packing materials and if possible,

return the unit in the original carton and packing materials.

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D2500 Features

The Samson D2500 Digital Graphic Equalizer utilizes state-of-the-art, DSP and filtering technology for precise tonal

control. Here are some of its main features:

•

The D2500 is a stereo or two channel digital equalizer with each channel providing 31 bands of equalization,

each frequency band representing 1/3 of an octave, on ISO standards, in the 20 Hz to 20 kHz range.

•

The front panel provides 32 analog 45mm LED faders for instant filter adjustment and true analog feel.

Custom Liquid Crystal Display is easy to read and provid es critical paramter information.

Advanced 32 bit floating point DSP with high-end, 24 Bit 96K sample rate Analog-to-Digital and Digital-to

Analog converters provides a pristine sound quality with low distortion and wide dynamic range.

•

Variable Q Filters with programmable bandwidth (1/4, 1/3 and 1/2 octave) ensures that the filter of the selected

frequency area stays the same even when approaching maximum boost or attenuation. Plus, Auto Bandwidth

allows individual filters to have different filter cues. As a result, the frequency response of the D2500 will as

close as possible to your faders settings.

•

Automated Feedback recognition, indication and suppression (Manual or Auto mode) with Automated Filter

Restoration.

•

The D2500’s fader can be set for either 3, 6 or 12 dB of gain and attenuation for each of the frequency bands.

An onboard programmable Delay is included for time aligning speakers.

The D2500 offers programmable High and Low Pass Filters for setting contour curves or for removing low-end

stage rumble.

•

To help keep the over all system noise level low, the D2500 includes a programmable Noise Gate with variable

threshold control.

•

An added layer of speaker protection is accomplished by using the D2500’s programmable

brick wall

Limiter.

The programmable Enhancer can be used to add extra highs or as a noise reduction system by lowering the

high frequency bands when no high end content is present.

•

Equalization curves plus all digital effects can be stored or recalled using the 99 Preset Locations.

Configure larger systems using multiple D class units which communicate over standard MIDI, or with Samson’s

optional high-speed D-Net interface card.

•

Electronically balanced XLR inputs and outputs.

Internal power supply ensures reliability and trouble-free operation.

Standard 19”, 2 rack-space design for easy integration into any traveling or fixed installation audio system.

Aluminum extruded front panel and steel chassis makes the D2500 eminently road-worthy.

Three year extended warranty.

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Controls and Functions

Front Panel Layout

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11 RIGHT switch - Assigns the Right (CH1) equalizer

FADER – 45mm LED fader for each of the 31 frequency

bands, which can be software set for +/- 12 dB or +/- 6 dB

or +/- 3 dB of cut and boost.

to the physical controls.

12 MANUAL switch – When engaged, the left and

right equalizers are linked to the physical faders.

ABOVE NULL LED – Red LED indicating the fader is

below the null (matching) point. Note: the null point

is the exact location where the fader's physical postion

matches the level of the digital filter.)

13 FBM switch – Used to access the automatic

Feedback control parameters.When selected, the

amber LED will illuminate and the associated val-

ues will be displayed in the LCD window.

MASTER FADER - 45mm LED fader for the Main Output

level, which can be software set for +/- 12 dB or +/- 3 dB

or +/- 6 dB of cut and boost, as well as +12/- 120 dB or

+6/- 120 dB or +3 dB /- 120

14 EQ switch -- When engaged, the amber LED will

illuminate indicating that the EQ parameters are

under control and displayed in the LCD window.

LCD DISPLAY – Backlit display that shows the various

parameters under control by the operating system.

15 GATE switch - Used to access the automatic GATE

control parameters.When selected, the amber LED

will illuminate and the associated values for the

digital noise gate will be displayed in the LCD win-

dow.

DATA WHEEL – Rotary encoder for entering parameter

values.

BELOW NULL LED - Green LED indicating the fader is

above the null (matching) point. Note: the null point is the

exact location where the fader's physical postion matches

the level of the digital filter.)

16 DELAY switch - When engaged, the amber LED will

illuminate indicating that the DELAY parameters

are under control and displayed in the LCD win-

dow.

BYPASS switch – When the red LED is on, the digital

equalizer, as well as all the on-board digital processing

effects, are defeated.

17 ENHANCER switch - When engaged, the amber

LED will illuminate indicating that the DELAY

parameters are under control and displayed in the

LCD window.

A / B switch – Used to switch between the your actual

modified program, to the last program that has been

loaded or stored into memory.

18 HP / LP switch – LED switch used to access the

automatic HI PASS and LOW PASS control param-

eters.When selected, the amber LED will illuminate

and the associated values for the high and low pass

filters will be displayed in the LCD window.

LEFT switch – Assigns the Left (CH1) digital equalizer to

the physical controls.

10 LINK switch – Used to control the left and right (CH1 and

CH2) equalizer simultaneously with the one set of physi-

cal controls.

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Controls and Functions

19 LIMITER

switch

– This switch is used to page

through the LIMITER parameters. When selected,

the amber LED will illuminate and the LIMITER

parameters will be displayed in the LCD window.

22 MIDI

switch

- This switch is used to page through

the MIDI parameters. When selected, the red LED

will illuminate and the MIDI parameters will be dis-

played in the LCD window.

20 IN

/ OUT switch

– The LED switch is used

to engage the EQ, FEEDBACK, GATE, DELAY,

ENHANCER and LIMITER effects

hen one of

the above effects switch is selected, (for example

FEEDBACK), that effect is turned on when the IN /

OUT amber LED is illuminated.

23 LOAD

switch

– Used to load one of the 100 pro-

grams from the internal memory.

24 STORE

switch

- Used to store one of the 100 pro-

grams into the internal memory.

25 Level

Meter

- Twelve segment LED meter display

21 GLOBAL

switch

– When engaged, the red LED will

illuminate indicating access to the unit's GLOBAL

parameters.

the input level.

Rear Panel Layout

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THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES

CLASS B. OPERATION IS SUBJECT TO THE FOLLOWING TWO

CONDITIONS: (1) THIS DEVICE MUST NOT CAUSE HARMFUL

INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY

INTERFERENCE RECEIVED INCLUDING INTERFERENCE THAT

MAY CAUSE UNDESIRED OPERATION.

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POWER SWITCH – When set to the ON position the

D2500 is powered up and ready for operation.

CH1 Balanced XLR jack input - Electronically bal-

anced XLR jack input.

MIDI IN DIN connector – The D2500 receives standard, or

system exclusive, MIDI data here.

CH2 Balanced XLR jack input - Electronically bal-

anced XLR jack input.

MIDI OUT DIN connector - The D2500 transmits stan-

dard, or system exclusive, MIDI data here.

CH1 Balanced XLR jack output - Electronically

balanced XLR jack output.

MIDI THRU DIN connector - The D2500 passes standard,

or system exclusive, MIDI data here.

CH2 Balanced XLR jack output- Electronically

balanced XLR jack output.

I/O Accessory Blank Panel – removable blanking panel

accesses option bay for adding additional Analog-to

Digital or Digital Input/Output boards.

AC input fuseholder - Connect the supplied heavy

gauge 3-pin “IEC”power cable here.

D-NET Accessory Blank Panel – removable blanking

panel accesses option bay for adding the D-NET interface

card for control multiple D class units.

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D2500 Quick

Start

SETTING UP THE D2500 to work in MANUAL mode

The D2500 is simple to use. In fact, you can use it just

like a standard analog graphic equalizer by simply set-

ting the unit to MANUAL mode. Setting up your D2500

Graphic Equalizer to run in MANUAL mode is a simple

procedure which takes only a few minutes:

4. The D2500 can be used either as an “in-line”device,

as an insert device (in conjunction with mixer insert

points), or in an effects send-return loop. The illus-

trations on pages 20 - 22 show each of these typical

configurations. Choose the configuration that is

best for your application and then begin by making

the D2500 input connections, using the XLR con-

nectors on the rear panel.

1. Remove all packing materials (save them in case of

need for future service) and decide where the unit is

to be physically placed—it can be used free-stand-

ing or mounted in a standard 19" rack.

5. Next, make the D2500 output connections to your

power amp or active speakers, using the XLR con-

nectors on the rear panel.

2. Make sure the power to all mixers and amplifiers in

your audio system is off. On the rear panel of the

D2500, place the Power switch to it’s OFF position

and set the Main Level slider, located on the front

panel, to it’s bottom-most “OFF”setting.

6. Plug in the supplied AC cord and connect it to any

standard AC socket.

3. Set all Equalizer sliders to their flat (“0”) center

detented position.

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D2500 Quick

Start

12. Apply an input signal to the D2500 (if sending signal

from a mixer output bus, drive the mixer’s output meters

at approximately 0 VU). While the input signal is present,

slowly raise the front panel main level slider to it’s center

detented “0”point. For the best signal-to-noise ratio, the

main level slider should be at or near the “0”point during

normal operation. However, if the input signal is weak,

use the main level slider to slightly boost the volume (to

a maximum of 12 dB). Conversely, if the signal causes

the front panel OL (Over Load) LEDs to light, you must

attenuate the volume of the input source as necessary. In

normal operation, the OL LEDs should not light at all; if

they do, lower the volume of the output signal so that it

does not light at all (clipping not only sounds awful, it can

also damage speakers!).

SETTING UP THE D2500 to work in MANUAL mode

(continued)

7. Press the rear panel Power switch to turn on the

D2500.

Note, if you are using the optional AI02 analog I/O board, the

audio signal will be muted for approximately five seconds

until the relay power-on circuitry is activated (at which time

you’ll hear a click and the audio signal will be unmuted).

8. If you are using the D2500 for the first time, the unit

should be set to that factory defaults, however, in case

the unit's parameters have been modified, it's a good

idea to load in a default program. So, press the LOAD

switch, turn the Data Wheel to 00 and press LOAD again

to recall the program.

13. Experiment by moving each of the Equalizer sliders

up and down, carefully listening to the audible result on

the audio signal. Bear in mind that the very lowest and

highest frequency areas may have little or no effect on

some signals. As you work with the various EQ filter fad-

ers, press the front panel BYPASS switch in and out from

time to time in order to compare the effect of the equal-

ization curve you are creating with the original input

signal.

9. Since this example assumes that you are running a ste-

reo sound system, be sure that LINK is selected to be sure

that the D2500's hardware controls will operate both the

left and right side. Press the LINK switch so that the LED

becomes illuminated.

Actually, you really don't have to press LINK because the

hardware controls are always linked in Manual mode.

Now that you have a feel for the D2500 working iin Manual

mode, move ahead a explore the powerfull features of the

internal D class DS

However, it may help you remember that you are editing

both the left and right sides.

10. Next, pull the Master Fader all the way down.

11. Now, simply press the MANUAL switch and the D2500

will operate like a standard graphic equalizer.

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Operating the D2500

Navigating the D2500 Controls

GLOBAL

The GLOBAL control allows you to set up the various system

parameters including the input , the equalizer filter band-

width, filter range and the range of the Master Fader.

Before you move ahead into the many D2500 onboard

features, you should become familiar with the front

panel controls and the various parameters that they

can set. The D2500's front panel switches are set up in

groups related to the function or parts of the operating

system they control. Some switches are placed individu-

ally, since they are dedicated to a single function, and

other switches are arranged in groups since their func-

tionality is related. The D2500 function switch sections

are arranged on the front panel as follows; First, is the

BYPASS switch that enables you to turn the equalizer and

all effects on or off. Next is the A/B switch that lets you

The Global Switch Has Five Clicks!

Click Menu

Function

Value

Inp. Input

Md. Mode

F.Bw Filter Bandwidth

F.R. Fader Range

M.F. Master Fader Range -12dB, -120dB

Opt 1, Opt 2

Stereo, Dual

1/4, 1/3,

or 1/2dB & Auto

+/-3dB +/-6dB +/-12dB

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Selecting the Input

compare the actual modified program to the last program

loaded or stored . Then you will find a group of switches

including LEFT, LINK and RIGHT which are used to assign

the D2500's hardware controls to operate the Left, Right

or Left and Right EQ channels. MANUAL is the next switch

and it allows you to operate the unit just like a standard

analog graphic equalizer. The next section is where you

will find the D2500’s powerful onboard digital effects,

which are controlled by the FEEDBACK, EQ, GATE, DELAY,

ENHANCE, HP /LP, LIMITER and IN/OUT switches. GLOBAL

gives you access to the overall system settings, and MIDI

lets you set up the device-to-device communications

including Samson Audio’s high-speed, D-Net protocol.

Finally, in order to save and retrieve your favorite set-

tings, the D2500’s LOAD and STORE switches allow you to

access the 100 on-board presets. The following sections

of this manual will detail each of the switches and their

associated parameters. Instead of going from left to right,

we’ll switch up the order a bit for a more logical flow

through the system.

The D2500 accepts inputs from any of the installed I/O

(Input/Output) boards including the standard AI01, option-

al DIO1 Digital I/O or AIO2, or premium audio converter I/O

board. To access the input follow these steps:

• Press the GLOBAL control switch a few times until you

see the: Inp.

• Use

the Data Wheel to select OPT 1 or OPT2.

NOTE:

Once you make an edit to the Global set-up, the red

GLOBAL LED will flash indicating that a change has been made

to the original set-up. You will also see that the red STORE LED

is illuminated

• To keep the new changes, press the STORE button and

you will exit the GLOBAL mode and both the STORE and

GLOBAL LED’s will turn off.

You should know this !

Some switches are capable of accessing more than one

parameter, so as you press the switch you will page

through the available parameters. These include the FBM,

GATE, HP/LP, Limiter, GLOBAL and MIDI. For example, the

FBM switch has five clicks to page though the parameters,

Feedback Management On/OFF, Sensitivity, Feedback

MAX, Feedback HOLD and Feedback RELEASE. You can

change the parameters of any of these functions by using

the large Data Wheel located by the main LCD display.

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Operating the D2500

Selecting the Filter Bandwidth

To change the Master Fader’s attenuation range follow

these steps:

Thanks to the powerful onboard DSP, the D2500 has the

ability to program the equalizer filter bandwidth for either

1/4, 1/3, 1/2 of an octave, or to AUTO, which will allow

each of the 31 filters to be set to an individual bandwidth

calculated by the onboard DSP. To access the Filter band-

width settings follow these steps:

• Press the GLOBAL control switch until you see the M.F..

• Use

the Data Wheel to select the operating range of

Master Fader.

• Press

the GLOBAL control switch a few times until you

see the

B.W. .

• To keep the new changes, press the STORE button and

you will exit the GLOBAL mode and both the STORE and

GLOBAL LED’s will turn off.

• Use the Data Wheel to select 1/2, 1/3 or 1/4 of an octave,

or to AUTO.

Selecting the Operating Mode

The D2500 can be used as a stereo device with 31-bands

of filters and the right and left side, or as a dual mono with

31-band equalizer for each of the mono signals.

• To keep the new changes, press the STORE button and

you will exit the GLOBAL mode and both the STORE and

GLOBAL LED’s will turn off.

It is also possible to change the operation of the equal-

izer from Stereo to Dual (two times mono). To change the

Operating Mode, follow these steps:

Selecting the Fader Range

It is also possible to change the fader range of the equal-

izer filters from 3dB, to 6dB or 12dB. To change the

Frequency Range, follow these steps:

• Press the GLOBAL control switch a few times until you

see the Md.

• Press

the GLOBAL control switch a few times until you

see the

• Use

the Data Wheel to select Stereo or Dual

• Use

the Data Wheel to select +/-3dB, to +/-6dB or +/-

12dB.

• To keep the new changes, press the STORE button and

you will exit the GLOBAL mode and both the STORE and

GLOBAL LED’s will turn off.

• To keep the new changes, press the STORE button and

you will exit the GLOBAL mode and both the STORE and

GLOBAL LED’s will turn off.

Setting the Range of the Master Fader

You can set the D2500’s Master Fader can be set to operate

in the following ranges;

+12/-12dB, or +12/-120dB.

The

Master Fader attenuation range is always either the same

as the filter faders, or it can be set to -120dB. The Master

Faders boost range will always be equal to the boost range

of the filter faders.

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Operating the D2500

Using the Left, Right and Link Control Switches

Using the D2500 in MANUAL Mode

The D2500 can be used as a stand-alone basic digital

signal processor using any stored or recalled memory

parameters when set to MANUAL mode. If you want to

use all the power processing of the D2500, but you don’t

want to recall or save any presets, you can operate the unit

in Manual mode. When you press the Manual switch, the

D2500 equalizer and effects section are all available, how-

ever they will be in the state that they were last left in.

Since the D2500 is a two-channel unit, you can use it as

a stereo, or dual mono equalizer if you are running two

monitor mixes. Depending on the operating mode you set

up in the Global menu, you may want to have the left and

right channels operate together, or individually. The LEFT,

RIGHT and LINK switches will help you operate the D2500

easily and give you the control you need to quickly make

changes and control either one or both sides. The state of

these switches will determine which of the left and right

signals are affected by the hardware control surface.

While Manual is selected, the EQ faders automatically

become reset to their physical positions so the equalizer

Using the LINK switch

If you want to set the D2500 so that the phyiscal hardware

controls and all the parameter controls adjust both the

Left and Right side, press the LINK switch so that the green

LED is lit. Now, when you operate any of the controls, ei-

ther the EQ faders or the digital effects, you will be making

the same change on the left and right sides.

works the same as a standard analog graphic equalizer.

You can also engage any of the onboard effects proces-

sors. For more information on the built-in digital effects

see the section "Using the D2500 onboard effects" later in

this manual. Keep in mind that the Left and Right channels

automatically become linked in MANUAL mode.

If you want to use the D2500 as a dual mono equalizer and

control the Left and Right sides individually, keep the LINK

switch OFF so that the green LED is not lit.

Controlling the Right Channel signal

If you want to control the EQ faders and the effects for

the right channel individually make sure the LINK switch

is OFF. Now, press the RIGHT switch to assign the hard-

ware control surface to the signal connected to the right

channel. With the RIGHT switch selected on and the LINK

switch off, the D2500 controls will edit just the right chan-

nel filters and right channel parameters, when accessing

the various menus.

Controlling the Left Channel signal

If you want to control the EQ faders and the effects for

the right channel individually, make sure the LINK switch

is OFF. Now, press the LEFT switch to assign the hardware

control surface to the signal connected to the left chan-

nel. With the LEFT switch selected on and the LINK switch

off, the D2500 controls will edit just the left channel filters

and left channel parameters when accessing the various

menus.

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Operating the D2500

Working with the D2500 Faders

At this point you should notice that the red and green, null

LED’s are now lit above and below the faders that have

been moved. This LED indication is telling you that the

EQ faders need to be moved if you want to null, or match,

them to the original saved positions.

Unlike menu driven, black box devices, the D2500 is a digi-

tal equalizer with standard 45 mm analog faders for the

31 filter bands, plus the Master level fader for true analog

control. If you are operating the D2500 in Manual mode,

the faders work exactly like you would expect on a stan-

dard analog graphic equalizer. However, since the D2500

is able to recall and save EQ curves in its internal memory,

the physical fader for any, or all of the EQ filter bands,

may not be in the same positions as they were when they

were saved into the memory preset. This means that the

hardware faders can be at a different physical position,

compared to the actual setting for the filter band that’s

in memory. The D2500 offers an easy to use system for

matching, or nulling out, the EQ faders to the memory

positions using the above and below fader Null, or match-

ing LED’s.

Note:

The null point is the exact location where the fader's

physical postion matches the level of the digital filter.

The D2500 lets you match, or null, the fader to the memo-

ry location by using two Null LED’s, one red, placed above

the fader, and green, placed below the fader. The follow-

ing example shows you how to work the faders with their

associated over and under matching, or Null LED when

loading a preset.

• Choose an EQ fader that has the red Null LED lit and

push the fader up slowly until the red Null LED goes off.

Now the physical hardware EQ fader is set to the same

position as the EQ filter band in memory.

Note: In this exersise you will be loading in preset 00. If you

are not very familiar with working with the presets, just stay

on preset 00. Preset 00 can not be overwritten, so don't worry

about erasing anything.

• Press

the MANUAL button to deselect MANUAL mode

(LED OFF).

• Set all the faders to their center detent position.

• Press

the LOAD switch.

• Now, use the Data Wheel to dial up preset 00. Pre set 00

contains a default setting with all faders set to zero.

• Choose an EQ fader that has the green Null LED lit and

push the fader down slowly until the green Null LED

goes off. Now the physical hardware EQ fader is set to

the same position as the EQ filter band in memory.

• Next, press load again. Now you have loaded in preset

00.

At this point all the EQ faders will be lit, except the one

assigned to the LCD, and none of the over and under Null

LED’s should be lit.

• Press all the EQ faders to the center, zero mark.

• Press

the LOAD switch.

• Now, push several of the faders up and down to random

positions.

• Use the Daawheel to dial up preset 00.

• Press the LOAD switch to reload presset 00.

• Press

the LOAD switch.

• Now, use the Data Wheel to dial up preset 00. Pre set 00

contains a default setting with all faders set to zero.

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Operating the D2500

Using the Process Switches

the LCD. For more information on the physical faders and

how they work with presets, see the previous section,

"Working with the D2500's Faders" .

In addition to being a great sounding, clinically precise,

digital equalizer, the D2500 provides a host of useful digi-

tal effects, which have been designed to make an audio

engineer’s job easier and project sound better. Don't look

for reverbs and chorus effects here, just solid digital effects

processors designed for loudspeaker management. The

EQ switch gives you access of the digital filters in the LCD

screen so you can view an accurate measurement of any of

the 31 EQ bands, as well as the Master Fader. The D2500's

FEEDBACK Management processor provides an automatic

feedback management system to clean up live PA and

monitor systems. The GATE effect allows you to eliminate

annoying buzzes and hums. The DELAY effect is perfect

for phase aligning speakers systems using multi-transduc-

ers and for delaying speaker arrays in large venue instal-

lations. The D2500’s unique ENHANCER effect will help

reduce the over all system noise, while at the same time,

sweeten-up the high end of any speaker. To set the over-

all low or high-end frequency contour, the D2500 features

multi-pole Hi-pass and Low-pass filters. Speaker protec-

tion is handled with the D2500’s digital brick wall LIMITER.

To use the EQ section follow these steps:

•

Press the EQ switch until the yellow LED is lit.

•

Now while the EQ switch is lit, engage the equalizer by

pressing the IN / OUT switch until the yellow LED lights.

•

To monitor the current EQ points, use the Data Wheel to

scroll through the EQ filters.

In order to change any EQ filter, simply grab the fader

and move it up to boost the frequency or down to cut

the frequency.

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The Navigation buttons located in the center of the unit

under the faders, along with the Data Wheel, control the

various parameters used to set-up these powerful ef-

fects. Remember, some of the effects may have several

pages, which are accessed by pressing through the effects

Using the FEEDBACK Management Function

The D2500 has an intelligent automated system to help

reduce the chance of feedback in any live sound situation.

You can use the Feedback Management System to auto-

matically scan the sound system, identify the frequency

bands that are feeding back, and then, attenuate those

bands. You can also use the Feedback Management System

in MANUAL mode in which the D2500 will scan the system

for feedback, and then display the frequency bands that

are feeding back by lighting the red LED over the fader.

Once you see the fader feeding back you can simply lower

the fader band yourself using the hardware fader.

switches

u should know this!

The D2500 processing effects can be individually selected

The FBM Switch Has Five Clicks!

on or off, using the IN / OUT switch located at the end of

the row of process switches. Also, remember to make sure

the LINK switch is lit, if you want to make changes to the

processing effects on the left and right channel simultane-

ously.

Click Menu

Function

Value

Off, On, Auto

0 - 10

- 0.5 dB - -12dB

5 - 300 milisec.

FBM

Mode

Sensitivity Sensitivity

FB Max

FB Hold

FB Rel

Maximum Cut

Filter Hold Time

Filter Release Time 20 - 300 milisec.

Using the EQ section

When the EQ switch is selected, the D2500's various

parameters for the 31 equalizer filters, as well as the

Master Fader filters are displayed in the LCD window . You

can use the Data Wheel to scroll through the frequencies

and display the filter levels in the main LCD window. It

is easy to see which fader is assigned to the display by

watching the LED in the fader caps of each filter band.

The D2500 uses an inverse highlight to display the active

filter band. When the LED is off, the fader is selected. If you

move a physical fader you will see the fader cap LED go off

indicating that the information for that fader is now being

displayed in

You can operate the Feedback Management System by fol-

lowing these simple steps.

• Press the FEEDBACK switch until you see the screen FBM:

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• Press

the FBM switch and use the Data Wheel to

and

select FBM: ON.

• Now, engage the effect by pressing the IN / OUT

switch until the yellow LED lights.

• Now, engage the effect by pressing the IN / OUT switch

until the yellow LED lights.

•

To access the Threshold parameter, press the GATE

switch once or twice until you see the menu, Gate Th.

The Gate Threshold can be set from –100 dB to 0 dB.

• To access the Feedback Sensitivity parameter, press the

FBM switch until you see the menu, Sensitivity. The

Feedback Sensitivity is used to set the threshold that the

D2500 uses to recognize feedback. Now you can select a

Sensitivity of 0 – 10.

• To access the Release parameter, press the GATE

switch until you see the menu, Gate Rel. The Gate

Release time can be set from 50 to 100 %, which is the

equivalent to 2 to 15 seconds.

• To access the Feedback Hold Time parameter, press the

FEEDBACK switch until you see the menu, FB Hold. The

D2500’s Feedback management system uses HOLD time

to keep a filter cut after the system identifies feedback.

Now you can select a Hold time of 5– 300 seconds.

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Using the Internal DELAY

The D2500 offers an on board Digital Delay to time align

speakers for phase correction and for setting up delay

clusters in large venue sound systems. The Delay can

be set from 0 to 85 milliseconds. (Optional memory can

be added for longer delay times.) Setting the delay is a

simple procedure which can be accomplished by follow-

ing the next few steps:

•

To access the Feedback Release Time parameter, press

the FEEDBACK switch until you see the menu, FB Rel..

Now you can select a Release time of 20 – 300 seconds.

If the feedback is temporary, the D2500 will attempt

to restore the fader back to the original position. The

Release time, is the time the D2500 takes to return the

fader back to the original level.

• Press the DELAY switch so that the yellow LED is lit.

Using the Internal Noise GATE

• Engage the effect by pressing the IN / OUT switch until

the yellow LED lights.

The D2500 digital effect section includes a digital noise

gate that can be very useful in eliminating the system

hums and buzzes that may occur, especially when you

moveyour system from venue to venue. A noise gate is a

powerful dynamics processor that works like an automatic

mute. Simply put, when the desired signal is present, the

gate is open and the sound can be heard. When the signal

is soft, like when the music stops, and all you hear are the

hums, buzzes and system noise floor, the gate is closed.

The D2500 GATE has variable control over Threshold and

Release time. Threshold is the level you set at which the

noise gate will close (mute the sound). You want to set a

level in between the noise floor and the normal operating

level of your program. Release Time is the amount of time

the D2500’s Gate takes to return the signal to the original

level after the signal rises above the Threshold level.

• Now, use the Data Wheel to select the correct delay

time for your application.

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Using the Internal ENHANCER

The D2500 has unique digital Enhancer, which can help

sweeten a sound system, and at the same time, reduce

unwanted noise.

The D2500’s Enhancer uses several

powerful algorithms to analyze the signal content and

then decide how to enhance the signal; based on that

content. If

the D2500 Enhancer senses that there is

music playing with good high frequency content, it will

slightly boost these frequencies creating sweet and

airy top-end response. When the D2500 Enhancer sees

that there is little or no high-frequency content, it will

slightly reduce the high-frequency response of the sys-

tem. This can be especially useful since often when the

high-frequency content is very low, or off, the only thing

you hear is system hiss. The Enhancer will recognize the

noise and reduce it by cutting the associated EQ filters

automatically.

The Noise Gate Switch Has Two Clicks!

Click Menu

Function

Value

50 - 100 %

0 -

-100 dB

Gate Rel.

Gate Th.

Release Time

Threshold Level

To operate the D2500 digital noise GATE, follow these

simple steps:

• Press the GATE switch so that the yellow LED is lit.

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Operating the D2500

Once the highs return, the Enhance releases automatically.

Of course the D2500 let’s you dial up just the right amount

of Enhancer for your project, so follow the steps below to

activate the Enhancer.

Any good high and low-pass filter will allow you to choose

the cut-off frequency, and also, the order, or slope, at

which the filter will attenuate. The D2500 lets you set the

frequency at which the HP or LP filters cut from, as well as,

a slope of either 6, 12 or 18 db per octave.

• Press the ENHANCER switch so that the yellow LED is lit.

The HP / LP Switch Has Four Clicks!

Click Menu

Function

Value

• Engage the effect by pressing the IN / OUT switch until

the yellow LED lights.

Highpass low Cut Filter 20 Hz - 200 Hz

HP-Order Filter Slope

Lowpass low Cut Filter 2 kHz - 20 kHz

Lp-Order Filter Slope

0, 6, 12, 18 per Octave

• Now, use the Data Wheel to select the correct Enhancer

setting , from 0 to 100%, that’s right for your application.

0, 6, 12, 18 per Octave

• Press the HP / LP switch so that the yellow LED is lit.

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• Engage the effect by pressing the IN / OUT switch until

the yellow LED lights.

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• To set the High-pass filter press the HP / LP switch until

the LCD display reads; High-pass.

SettingupandUsingtheHighPassandLowPassFilters

The D2500 includes digital High-pass and Low-pass fil-

ters for creating quick equalization curve contours. A

Hi-pass filter, (sometimes called a low-cut filter), is used

to attenuate the frequencies below a certain point. The

HP filter passes the highs, but cuts the lows. A Low-pass

filter, (sometimes referred to as a high-cut filter), is used

to attenuate the frequencies above a certain frequency

point. The LP filter passes the lows, but cuts the highs.

• Now, use the Data Wheel to set the frequency from 20

Hz to 200 Hz.

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• Press the HP / LP switch again and you will see the menu

to set filter Order, or slope. The menu will read HP-

Order.

You can use the High and Low pass filters for a variety of

applications. Using the High-pass filter can be especially

useful in removing the low frequencies that can some-

times cause stage rumble. If you have a lot of high fre-

quency system noise and hiss, you can use the Low-pass

filter to roll-off the high-end of your system. When equal-

izing a monitor system, you may use both the HP and LP

filters to roll-off the high and lows for a vocal eq contour.

• Use the Data Wheel to choose a slope of either 6dB,

12dB, or 18 dB.

• To set the Low-pass filter, press the HP / LP switch until

the LCD display reads; Low-pass.

• Now, use the Data Wheel to set the frequency from 20

kHz to 2 kHz.

• Press the HP / LP switch again and you will see the menu

to set filter Order, or slope. The menu will read LP-Order.

• Use the Data Wheel to choose a slope of either 6dB,

12dB, or 18 dB.

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Operating the D2500

Using the Internal LIMITER for Basic Speaker

Protection

Using the A/B Feature

The A/B switch lets you compare the actual, modified

program to the last program recalled or stored in memory.

After you load a preset you may want to make some

changes to the equalization curve or perhaps to one or

more of the digital effects. Once you make some changes

you may want to compare the edit with the original pre-

set saved in memory. You can compare the current set

with the preset that is stored in memory by using the A/B

switch. Try the A/B function to compare and preset to an

edit by following these steps:

In order to help you protect your speaker system, the

D2500 employs a digital Limiter. The D2500's Limiter is a

brick wall type with a very fast attack time and a very slow

release time. When engaged, the digital Limiter will pre-

vent signals from reaching outputs levels over a desired

point. The D2500’s Limiter has a variable Threshold level,

which is the point the limiter circuit begins to attenuate

the system. The Limiter also has a variable Release time,

which is the time the limiter circuit takes to return the sig-

nal to the original level.

• Press the LOAD switch and select any preset, then press

LOAD again to recall the preset into memory.

The LIMITER Switch Has Two Clicks!

Click Menu

Function

Threshold

Release Time

Value

0 to -100 dB

50 to 100 %

• Play some music through the D2500.

Lim. Thr.

Lim. Rel.

• Now change the position of the faders so you can hear

the equalization curve change.

To operate the D2500 digital LIMITER follow these simple

steps.

• At this point you will notice that the green LED on the

A/B switch is lit, indicating that there has been a change

to the original preset.

• Press the LIMITER switch so that the yellow LED is lit.

• Now, engage the effect by pressing the IN / OUT switch

until the yellow LED lights.

• Now, press the A/B switch again and the green LED will

flash indicating that the D2500 has now returned all the

EQ faders and effects parameters back to the positions

that were saved in the presets. You can continue to press

the A/B switch to toggle back and forth between the

saved preset and the new sound.

•

To access the Threshold parameter, press the LIMITER

switch until you see the menu, Lim. Th. The LIMITER

Threshold can be set from –100 dB to 0 dB.

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If you like the new edited preset you can use the STORE

function to save the new preset either under the current

memory location or a new one.

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•

To access the Release parameter, press the LIMITER

switch until you see the menu, Lim. Rel. The LIMITER

Release time can be set from 50 to 100 %, which is the

equivalent to 2 to 15 seconds.

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• Once you select the program number to load, simply

press the LOAD button again and your preset is loaded

into memory.

Storing Programs in the D2500

The D2500 has 99 memory locations (labeled 01-99) for

storing user presets. You can save the equalization curve,

as well as all the parameters for the routing and the

onboard effects that may be active. Saving the preset is a

simple procedure which is accomplished with the follow-

ing easy steps.

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• Press the STORE button and the LED will begin to flash

indicating that the D2500 is ready to store the current

set-up into one of the 99 memory locations.

Using the Load MASK function

The D2500 allows you to mask certain saved parameters

when loading in a preset. This is a powerful feature that

allows you to create a new preset by merging different

saved equalization curves with other saved effects set-ups.

When you get deeper into the features of the D2500, there

may be many parameters to set to create your final sound.

A “hidden

”

eature in the D2500 is the Set Mask function.

This allows you to load other programs and “Mask Out”

(retain) certain parameters.

• Now, you need to decide if you want to save the set-

up in the current memory location, or if you want to

choose a new memory location. If you want to use the

current location go on to the next step. If you want to

choose a new memory location, use the Data Wheel to

scroll through the 99 preset numbers until you reach the

number you want to save under.

• Once you select the program number to save under,

simply press the STORE button again and your set up is

saved and can be easily recalled using the LOAD func-

tion.

Example:

In your overall setup, you have a delayed stack of speakers

on the left side with a setting of 40mS. You have your limiter

set to +2dB to not overdrive your amps, and your subs are

being crossed over to a different amplifier. So from 80Hz on

down, you set a High Pass filter so that the Bass is not passing

through the D2500 to the delayed stack.

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Lets say you want to load program #2 one hour into the

show, ( a slightly hotter EQ curve that you stored in mem-

ory location #2 before the show began for use when the

room fills up).

You want to change the EQ curve but you do not want to

load in the program #2’s Delay, HP, and Limiter settings.

Loading Programs in the D2500

You can load presets with stored equalization curves, as

well as all the parameters for the routing and the onboard

effects that may have been used. Loading a preset is a

simple procedure, which is accomplished with the follow-

ing easy steps.

• Press

and hold Store.

• Press the LOAD button and the LED will begin to flash

indicating that the D2500 is ready to load one of the 99

memory locations.

• Now, you need to decide if you want to load the set-

up in the current memory location, or if you want to

choose a preset saved in a different memory location. If

you want to use the current location go on to the next

step. If you want to choose a new memory location, use

the Data Wheel to scroll through the 99 preset num-

bers until you reach the number you want to recall into

memory.

FBM, EQ, GATE, DELAY, ENHANCE, HP/LP, LIMITER, AND IN/

OUT will light.

• Press Delay, HP/LP, and Limiter and their respective LED’s

will go out.

• Now when you load any other program, you will

retain your Delay, HP/LP, and Limiter settings. Only the

Parameters not “Masked”will load from the second pro-

gram loaded..

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Operating the D2500

• To keep the new changes, press the STORE button and

you will exit the MIDI mode and both the STORE and

MIDI the LED’s will turn off.

MIDI and D Net

For expanded system control, the D2500 uses standard

MIDI, as well as Samson’s D Net communication protocols,

to transmit and receive digital control information to and

from additional D class units, other MIDI devices, or per-

sonal computers. You can use standard MIDI cables for

IN, OUT and THRU to configure a system using traditional

MIDI protocol. For critical applications where higher speed

comunication is needed, you can install the optional

DN1, D-Net interface cards and use standard XLR cables

to configure a high-speed, bi-directional data hook-up

using Samson D-Net protocol. The MIDI and D-Net control

parameters are configured by accessing the various menus

with the MIDI switch, located on the D2500’s front panel.

Setting the D2500 to Transmit and Receive Data Using

D-Net

In larger systems, the D2500 and other D class units can

be configured with an optional DN1 D Net interface card

for high-speed communications. D Net follows a simi-

lar protocol as MIDI, only at a much higher data rate. As

mentioned in the previous section, the beauty of the D

net interface is, not only is it 30 times faster than MIDI, but

both send and receive are covered using a single standard

XLR cable.

To enable the D2500 to send and receive D-Net data fol-

low these steps:

You can use MIDI for controlling one D2500 with a Samson

D1500 RTA, but in larger systems, the D2500 and other D

class units should be configured with an optional DN1 D-

Net interface card for high-speed and bi-directional com-

munications. For ease of use, D-Net follows a similar user

interface as MIDI, but in reality they are very different. The

beauty of the D net interface is, not only is it 30 times fast-

er than MIDI, but both Send and Receive are covered using

a single standard XLR cable making it possible to daisy

chain several D class units together without the needs for

hubs or external mergers.. Also, the super fast D-Net bus

is fast enough to easily communicate with an external PC

for Real Time Analysis and display on an external moni-

tor. Plus as an added bonus, the error rate on the D-Net is

virtually zero, guaranteeing reliable performance during

critical applications.

• Press the MIDI switch until that LCD reads: Midi ON.

• Use the Data Wheel to select D. Net.

Press Store.

Now that you have enabled the D2500 for D-Net, as

described in the previous section, you can select addition-

al MIDI parameters that may be necessary for your exact

application or system set-up. The D2500’s MIDI has three

basic modes of operation Channel, Omni and System

Exclusive. The D2500 can operate in any of these three

MIDI modes.

When you press the MIDI switch several times you will

be paging though the various MIDI setup menu items

including MIDI enable, Channel, Omni, System Exclusive

and Program. The following section details each of these

modes and their associated parameters.

One of the most used MIDI modes is Channel MIDI, which

allows you to assign up to sixteen different devices to indi-

vidual MIDI channels 1 through 16.

Setting the D2500 to Transmit and Receive MIDI

To enable the D2500 to send and receive MIDI data follow

these steps:

Selecting a MIDI Channel

You can program the D2500 to receive MIDI messages on

a specific MIDI channel by following the next steps.

• Press the MIDI switch until that LCD reads Midi: Off.

• Use the Data Wheel to select Midi ON.

• Press the MIDI switch until the LCD reads: M. Channel 1.

• Use the Data Wheel to select: M. Channel 1 - 16.

NOTE:

Once you make a edit to the MIDI set-up, the red MIDI

LED will flash indicating that a change has been made to the

original set-up. You will also see that the red STORE LED is

illuminated

• To keep the new changes, press the STORE button and

you will exit the MIDI mode and both the STORE and

MIDI the LED’s will turn off.

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Operating the D2500

Selecting MIDI Omni mode

Selecting MIDI Program Change

You can program the D2500 to receive MIDI messages in

Omni mode by following the next steps.

You can program the D2500 to receive or transmit MIDI

Program messages. Program the D2500 for MIDI Program

Change operation by following these simple steps:

• Press the MIDI switch until that LCD reads OMNI.

• Use the Data Wheel to select Omni ON.

• Press the MIDI switch until that LCD reads: Pgm Ch. to

access the MIDI Program Change menu.

• Now, select one of the transmit and receive modes.

• If you want the D2500 to transmit system exclusive mes-

sages, use the Data Wheel to select: Pgm Ch. Tr.

• In order to set the D2500 to receive system exclusive

messages, use the Data Wheel to select: Pgm Ch. Rc.

• To keep the new changes, press the STORE button and

you will exit the MIDI mode and both the STORE and

MIDI the LED’s will turn off.

• If you want the D2500 to receive and transmit system

exclusive messages, use the Data Wheel to select: Pgm

Ch. T + R.

Selecting MIDI System Exclusive Mode

You can program the D2500 to receive or transmit MIDI

System Exclusive messages. Program the D2500 for System • Use the Data Wheel to select: Pgm Ch. OFF and the

Exclusive operation by following these simple steps:

D2500 will not transmit or receive any system exclusive

messages.

• Press the MIDI switch until that LCD reads: SysEx. Off: to

access the MIDI System Exclusive menu.

• Now, select one of the transmit and receive modes.

• If you want the D2500 to transmit system exclusive mes-

sages, use the Data Wheel to select: SysEx. Tr.

• To keep the new changes, press the STORE button and

you will exit the MIDI mode and both the STORE and

MIDI the LED’s will turn off.

• In order to set the D2500 to receive system exclusive

messages, use the Data Wheel to select: SysEx. Rc.

• If you want the D2500 to receive and transmit system

exclusive messages, use the Data Wheel to select: SysEx.

T + R.

• Use the Data Wheel to select: SysEx OFF and the D2500

will not transmit or receive any system exclusive mes-

sages.

• To keep the new changes, press the STORE button and

you will exit the MIDI mode and both the STORE and

MIDI the LED’s will turn off.

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Operating the D2500 with the D1500 RTA

When you use the D1500 RTA and the D2500 digital EQ

together they combine to create a powerful automatic

equalization system. You simply connect the two units

using D-Net or MIDI, and then the D1500’s AUTO EQ

feature to let the onboard DSP’s measure your system

response and adjust the equalizer for a flat response, or

for any EQ response curve that you may have saved in

memory.

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THIS DEVICE COMPLIES WITH ART 15 OF THE FCC RULES

CLASS B. OPERATION IS SUBJECT TO THE FOLLOWING TWO

CONDITIONS: (1) THIS DEVICE MUST NOT CAUSE HARMFUL

INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY

INTERFERENCE RECEIVED INCLUDING INTERFERENCE THAT

MAY CAUSE UNDESIRED OPERATION.

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The diagram above shows a typical set up for using a D1500 RTA with a D2500 digital equalizer to auto-equalize the loud-

speaker system.

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Operating the D2500 with the D1500 RTA

AUTO EQ YOUR SYSTEM

Using AUTO EQ with the D2500 Digital Equalizer

When you use the D1500 RTA and the D2500 digital EQ

together they combine to create a powerful automatic

equalization system. You simply connect the two units

using D-Net or MIDI, connect a high quality measurement

microphone, like the Samson MM01, and then use the

D1500’s AUTO EQ feature to let the onboard DSP’s mea-

sure your system response and adjust the equalizer for a

flat response, or for any EQ response curve that you may

have saved in memory. Follow the steps below to use the

AUTO EQ feature.

Once you have the Mic Input and Generator GAIN set you

can easily set the equalization curve for any loudspeaker

or system at the press of the single button. Just follow

these simple steps.

• Connect the MIDI OUT of the D1500 to the MIDI IN of

the D2500. and connect the MIDI OUT of the D2500 to

the MIDI IN of the D1500.

• Load program 00 on the D2500.

• With the measurement microphone in position, press

the AUTO EQ button. The display will read "Start: no".

Turn the data wheel to select "Start: yes". Press STORE

and the Auto EQ process begins.

Setting up Your Test Mic

• Using a standard XLR microphone cable, plug a high

quality measurement microphone, like the Samson

MM01, into the Mic Input located on the D1500’s rear

panel.

• Now watch, and listen, as the D1500 actually measures

the system frequency performance and adjusts the

filters on the D2500 for a flat response. You can see

the D2500’s EQ filters being automatically set on the

D1500’s large LED display.

• Position your measurement microphone approximately

10 feet from your loudspeaker array, halfway between

the low and high frequency drivers.

• Next select the MIC input by pressing the GLOBAL

button until the display reads “Inp.”And use the DATA

WHEEL to choose “Mic”.

• You'll see on the D1500 that the D2500 curves are

changing and that the equalizer filters are being set.

• Press RTA on the D1500.

• Now, you may need to adjust the microphone input

gain so press the Global switch again until you see “MG”

and select +30dB to start. Press STORE.

After a few minutes you'll notice that the frequency bands are

at same approximate levels.

NOTE: You may need to come back to this to make the

final mic gain adjustment once you start generating the

PINK NOISE at the desired operating level.

Now, press AUTO EQ again and the AUTO EQ switch

will stop flashing and you will see the new equalization

curve displayed on the D1500.

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Operating the D2500 with the D1500 RTA

Using the D1500 with the D2500

• Now, Let's set up the D2500.

In order for the D1500 and D2500 to communicate with

each other it is necessary to configure the MIDI param-

eters so that the units are communicating properly. Follow

the steps below to configure the MIDI parameters for

communication between one D1500 RTA and one D2500

Digital EQ. Let's start with the D1500:

• Press the D2500's Global switch a few times until the

display reads: F.R.

• Now, turn the Data Wheel until the dispay reads +/-12

dB.

• Press the D2500's Global switch a few times until the

display reads: F.Bw.

• Press the MIDI switch until you get to the “MIDI”screen

and use the DATA WHEEL to select “ON.”

• Then, turn the Data Wheel until the display reads 1/3

Oct.

NOTE: You may notice the MIDI light flashing which is indi-

cating that you are editing the MIDI set up.

• Press STORE to confirm the Global changes.

• Now, press the MIDI again and set the MIDI CHANNEL

number to “1”.

• Press the MIDI switch until you get to the “MIDI”

screen and use the DATA WHEEL to select “ON.”

• Press the MIDI switch once again and use the DATA

WHEEL to set the “OMNI”mode to “OFF”.

NOTE: You may notice the MIDI light flashing which is

indicating that you are editing the MIDI set up.

• Next, you need to configure the D1500 to transmit and

receive MIDI System Exclusive messages, so press the

MIDI switch again and use the DATA WHEEL to set the

SysEx to select “T+R”.

• Now, press the MIDI again and set the MIDI CHANNEL

number to “1”.

• Press the MIDI switch once again and use the DATA

WHEEL to set the “OMNI”mode to “OFF”.

• Press the MIDI switch once again and use the DATA

WHEEL to set the “Pgm Ch.”(MIDI Program Change) to

“OFF”.

• Next, you need to configure the D1500 to transmit and

receive MIDI System Exclusive messages, so press the

MIDI switch again and use the DATA WHEEL to set the

SysEx to select “T+R”.

• Once you have all the parameters set, press the STORE

button to save the changes to the MIDI set up.

• Press the MIDI switch once again and use the DATA

WHEEL to set the “Pgm Ch.”(MIDI Program Change) to

“OFF”.

• Once you have all the parameters set, press the STORE

button to save the changes to the MIDI set up.

��

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES

CLASS B. OPERATION IS SUBJECT TO THE FOLLOWING TWO

CONDITIONS: (1) THIS DEVICE MUST NOT CAUSE HARMFUL

INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY

INTERFERENCE RECEIVED INCLUDING INTERFERENCE THAT

MAY CAUSE UNDESIRED OPERATION.

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The diagram above shows the MIDI connections for using a D1500 RTA with a D2500

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Operating the D2500 with the D1500 RTA

Using the D1500’s EQ Display

The D1500 can be used to display the equalization curve

from 1, or up to 15, D2500 Digital Equalizers using the

standard MIDI or optional D-Net interface.

• Press RES and use the Data Wheel to select 2.0 dB,

which will correspond to the D2500 provided that the

Frequency Range (Global Menu) of the D2500 is set to

the default +/- 12 dB setting.

Before you get started using the EQ display feature, press

and hold the EQ switch for about two seconds and take

notice of the parameters that can be adjusted while using the

Generator. You’ll notice that the SOURCE and RES are illumi-

nated indicating that these parameters can be edited.

• Press

the SOURCE switch and choose the MIDI channel

number that corresponds to the D2500 you want to

display on the D1500. Since the D2500 is a stereo equal-

izer there is a left and right selection for each equalizer

assigned to a MIDI channel, select CH 1L for the left side.

• Connect

the MIDI OUT of the D1500 to the MIDI IN of

the D2500, and connect the MIDI OUT of the D2500 to

the MIDI IN of the D1500.

Note:

If MIDI OMNI ON is selected, the RTA will respond to the

D2500 that has most recently been changed.

• Now, press the D1500’s EQ switch.

• Now when you load in an EQ curve or move a fader on

the D2500 you will see the corresponding position of

each frequency band displayed on the D1500.

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The diagram above shows a D1500 RTA displaying the fader positions of a D2500 digital equalizer.

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Operating the D2500 with the D1500 RTA

• Now run your mic, MP3, or CD player signal, press

Using the signal Generator

RTA on the D1500 and check the LCD Meters on

the D1500.

The D 1500’s internal Signal Generator can be used

to produce Pink Noise,White Noise or a tunable Sine

Wave.

• While the D1500 is set to RTA, you may need to

adjust the GAIN to set the reference point of the

display.

You can use the Generator for a variety of applica-

tions including using the Pink Noise signal to flatten

the response curve of a speaker system with an ana-

log equalizer, or using the Sine Wave to output a sine

wave for tuning a crossover at a specific frequency.

Once you confirm that the system is operating normally

and that the RTA can read the system response with the

test mic, you can move ahead and generate the Pink Noise

to help you flatten the system.

Before you get started using the Generator, press and

hold the GEN switch for about two seconds and take

notice of the parameters that can be adjusted while

using the Generator.You’ll notice that the SOURCE,

GAIN, REF and FREQ are illuminated indicating that

these parameters can be edited.

• Connect the D1500 Left and Right Outputs to a pair of

inputs on your mixing console.

• Now make sure that the input gain controls and faders

on the inputs on your mixers have the D1500 outputs

connected and turned up to about 0dB.

• Press the GEN switch on the D1500.

The following example outlines a typical application

for using the D1500’s RTA and Pink Noise Generator

to flatten a loudspeaker system in a small to medium

size venue using a traditional analog graphic equal-

izer.

• To change the operating level reference scale press the

REF switch and use the Data Wheel to make the change.

• To be extra safe with your gear (this may get really loud!

really!), start with a very low signal level by selecting the

GAIN switch and turning the Data Wheel counter-clock-

wise all the way to –98dB.

• Connect your mixer, equalizer and power amplifiers

as you normally would and confirm that you have

normal output by playing a signal like that from a

mic, MP3, or CD player. It’s a good idea to set the

system to the same level that you will be ultimately

using during normal operation. Once you get the

system up and running mute the mic/MP3/CD, but

keep set up so you can use it to set the measure-

ment mic level.

• Next, press the SOURCE switch and turn the Data Wheel

until the display reads: SRC: PINK.

• To turn up the Pink Noise signal, make sure that GEN is

still selected and then press the GAIN switch and turn

the Data Wheel clockwise until your hear the level of the

pink Noise get about as loud as the system was when

you played your mic, MP3, or CD player signal,

• Now, press the RTA switch and you should see the vari-

ous frequency meters bouncing along.

• Connect a measurement microphone like the

Samson MM01 to the D1500 rear panel MIC INPUT.

Place the microphone on a stand and position it

about ear level, approximately 3 meters, or 10 feet,

from your speaker.

If the LED meters read very low on the display, or the you

don’tsee them at all, you will need to do one, or a combi-

nation, of the following:

1 Press Global and use the data wheel to select MG (Mic

Gain). Next, turn the Data Wheel clockwise to increase

the Mic Gain in 10 dB steps. Press the STORE switch to

accept the change. Repeat this step until the LED indica-

tors are operating in a range approximately halfway up

the display.

Note:

The proper spot to position the measurement

microphone will vary depending on the size of the

space the loudspeaker system is operating in.

• Press the Global switch once or twice until you see

Inp in the LCD display, then select Mic and press

STORE

2 Press the RTA switch and then the GAIN switch. Turn the

Data Wheel clockwise until the LED indicators are oper-

ating in a range approximately halfway up the display.

• Press Global again, and use the Data Wheel to set a

Mic Gain of +20 dB to start. Press STORE.You may

need to adjust the Mic GAIN up or down depend-

ing on your exact situation.

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System Configurations

In this example, the mixer’s stereo output is connected to the D2500’s inputs. Then, the D2500’s outputs are connected to the inputs of each

active (self-powered) loudspeaker.

Using the D2500 with Passive Speakers

In this example the mixer’s stereo output is connected to the D2500’s inputs. Then, the D2500’s outputs are connected to the input of a 2-

channel power amp. Next, the power amplifier’s outputs are connected to the passive (non-powered) loudspeakers.

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System Configurations

Using the D2500 into Insert Points

You can use the D2500 in your mixer’s insert points if you want to equalize two mono channels individually in the mix. In this example the

D2500’s Channel 1 INPUT and OUTPUT are inserted on a bass guitar channel using a 1/4-inch TRS to 2 x XLR“Y” cable, and the Channel 2

INPUT and OUTPUT are inserted on a keyboard channel using the same type of cable. For more information on cable wiring see the D2500

Wiring Guide page 27 in this manual.

Using the D2500 for Mains and Monitors

In this example, an D2500 is used for both the main PA speakers running a mono mix, and for the monitor mix, also in mono. For the main PA,

the mixer’s MONO output is connected to the D2500’s Channel 1 input. Then, the D2500’s output is connected to the input of the right main

PA active (self-powered) loudspeaker. The left main PA speaker is connected by “daisy-chaining” from the right. For the monitor mix, the mix-

er’s AUX output is connected to the D2500’s Channel 2 input.The D2500’s Channel 2 output is connected to the input of the monitor power

amplifier operating in bridge mode. Finally, the power amplifier’s outputs are connected to the passive (non-powered) monitor loudspeakers.

(See the owners manual for your specific power amplifier for the proper bridge mode operation.)

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System Configurations

Using Two D2500’s for Mains and Monitors

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D2500 Wiring Guide

There are several ways to interface the D2500, depending on your exact monitoring set-up. Follow the cable

diagrams below for connecting your monitor system.

Balanced - XLR to XLR Cable

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Balanced - 1/4” to FEMALE XLR Cable

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Balanced - MALE XLR to 1/4” Cable

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Unbalanced - 1/4" to FEMALE XLR Cable

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Unbalanced - XLR to 1/4" Cable

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Unbalanced - MALE XLR to RCA Cable

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Unbalanced - RCA to FEMALE XLR Cable

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XLR Insert Cable

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Specifications

Inputs

Type

electronically balanced

Connector

Impedance

Max. input level

AIO1:

XLR

22 kΩ at 1 kHz

+22

+14dBu

AIO2:

+20dBu

Outputs

Type

electronically balanced

XLR

100 Ohms at 1 kHz

Connector

Impedance

Max. output level

AIO1:

+14dBu

AIO2:

+20dBu

Frequency Response

10 Hz to 35 kHz (-1dB)

@ 96 kHz sampling rate

Signal-to-noise-ratio

AIO1:

Noise floor (unweighted) < -92 dBFS (-78 dBU)

Noise floor (A-weighted) < -100 dBFS (-86 dBU)

AIO2:

Noise floor (unweighted) < -106 dBFS (-86 dBU)

Noise floor (A-weighted) < -112 dBFS (-92 dBU)

0.005 % typ. @ +4 dBu, 1 kHz,

THD

unity gain

Digital Processing

Converter

24-bit Delta-Sigma,

64/128-oversampling

Sample rate

AIO1 & AIO2

DIO1

Frequency range

Display

32, 44.1, 48, 64, 88.2, 96 kHz

96 kHzType digital 31-band equalizer

20 Hz to 20 kHz, 31 bands on ISO standard frequencies

Type

Memory

Presets

Midi interface

Type

Custom LCD for parameter control

100 memory locations, 99 user programable

5-pin. DIN jacks In/Out/Thru

Power supply

Mains voltage

Power consumption

Fuse

Mains connector

Dimensions

115 V, 60 Hz, 230 V, 50 Hz

20 W typ.

T 630mA for 100- 120 Volt / T315mA for 220 - 240 Volt

Standard IEC receptacle

19 in. (w) x 10.5 (d) x 3.5 (h)

482 mm (w) x 267 (d) x 89 (h)

5.1 lb.(2.31 kg)

Weight

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Samson Technologies Corp.

575 Underhill Blvd.

O. Box 9031

Syosset, NY 11791-9031

Phone: 1-800-3-SAMSON (1-800-372-6766)

Fax: 516-364-3888

www.samsontech.com

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