Atlas MG2500 Bedienungsanleitung

Atlas Sound MG2500

Sound Masking Generator

with 2-Channel DSP

and Page Input

Operation Manual

Atlas Sound, 1601 Jack McKay Blvd., Ennis, TX 75119 U.S.A. (800) 876-3333 http:// www.AtlasSound.com

May 2002

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MG2500

TABLE OF CONTENTS

Front & Rear Panel Features

Setup

Logic Inputs

RS-232 Control

Specifications & Block Diagram

Warranty

Leveler FAQ’s

pg. 2

pgs. 3~11

pg. 12

pg. 13

pg. 14

pg.15

pg. 16

INTRODUCTION

The Atlas Sound MG2500 Sound Masking Processor provides a digital pink-

noise generator, a balanced line-level audio input, and a 2-channel DSP

processor, all in a single rack-

space unit. Noise & audio levels, plus two

channels of EQ, gain management, & delay, are adjusted via computer

software. Sixteen presets can be recalled via contact-closures, RS-232, or

other remote control options. The MG2500 carries a five-year warranty.

MG2500 features include:

♦pink-noise & audio input, with 2-channel DSP processor

♦noise generator spectral purity (±0.1dB @ 0Hz~20kHz)

♦precision pink-noise filtering (-3dB per octave low-pass)

♦generator repeat time of noise (200 minutes)

♦combined 1/3-octave & parametric equalization per channel

♦selectable high & low frequency shelving filters per channel

♦HPF & LPF with variable frequency & slope per channel

♦leveling, compression, limiting, & soft-gating per channel

♦output delay, with distance/delay calculation, per channel

♦two independent matrixes for channel-to-channel mixing

♦variable noise, input, & output levels with software metering

♦sixteen non-volatile memory presets store/recall settings

♦balanced input & outputs on plug-in barrier strip connectors

♦software for Windows®95/98/NT/2000/XP & cable included

♦no manual controls on front panel, to prevent tampering

♦remote control via RS-232 & programmable logic inputs

♦incorporates AES recommended grounding practices

♦marked and UL / C-UL listed power source

♦covered by Atlas Sound’s five-year warranty

FRONT & REAR PANEL FEATURES

MG2500

Sound Masking Processor

output 1 inputoutput 2

link port link logic inputs

serial port

50/60 Hz

27V

12 watts

class 2 wiring

Atlas Sound LP

1601 Jack

McKay Blvd

Ennis, TX 75119

Made in U.S.A.

MG2500

Sound Masking Processor

On Indicator: When power is applied to the MG2500, this red

LED will light indicating power to the unit is On. When power is

turned off, all current settings will be stored in non-volatile memory

and recalled when power is turned back on. NOTE: During setup

the MG2500 may instead be set to recall a special preset

whenever power is turned on (see Setup on pg. 10).

AC Power Cord: The power transformer provides 27 Volts AC to

the MG2500, and is detachable via a 5-pin DIN connector. The

MG2500 has two internal ‘self-resetting’fuses (there are no user

serviceable parts inside the unit). If the internal fuses blow, they

will attempt to re-set after a short period. However, this may be an

indication that the MG2500 requires service.

Serial Port: This 9-pin Sub-D (male) connector provides an RS-

232 Serial Port for remote control via computer or third-party

controllers (see RS-232 Control on pg. 13). The Serial Port has

the following pin assignments (left-to-right & top-to-bottom): Pin 1)

not used; Pin 2) Receive Data (RxD) input; Pin 3) Transmit

Data (TxD) output; Pin 4) Data Terminal Ready (DTR) output;

Pin 5) Ground; Pin 6) not used; Pin 7) Request To Send (RTS)

output; Pin 8) not used; Pin 9) not used. The default baud rate

for the Serial Port is 38,400 (See RS-232 Control on pg. 13). Atlas

Sound MG2500 software and a serial cable are provided for

programming via Windows®95/98/NT/2000/XP (see Setup on pg.

3). NOTE: The Serial Port can also transmit commands received

via the Logic Inputs (see Setup on pg. 10).

Link Port: This 9-pin Sub-D (female) connector provides a Link

Port for RS-232 control of multiple ATLAS SOUND®MG2500’s

(see RS-232 Control on pg. 13). The Link Port of one device

simply connects to the Serial Port of the next device (and so forth).

NOTE: All but the final MG2500 in a system should have the Link

Switch pressed in (see below). The Link Port has the following pin

assignments (right-to-left & top-to-bottom): Pin 1) not used; Pin

2) Transmit Data (TxD) output; Pin 3) Receive Data (RxD) input;

Pin 4) not used; Pin 5) Ground; Pin 6) not used; Pin 7) not

used; Pin 8) not used; Pin 9) not used. NOTE: The Link Port

will also transmit commands received via the Logic Inputs (see

Setup on pg. 10).

Link Switch: The Link Switch is used when connecting multiple

devices in a ‘Link Port to Serial Port’configuration (see Link Port

above). From the factory, the Link Switch is released (out). When

connecting multiple devices, the Link Switch must be depressed

(in) on all devices except the final device in the system (the device

with no Link Port connection). NOTE: The Link switch must

remain OUT when only a single device is being used.

Logic Inputs: This 25-pin Sub-D (female) connector provides

sixteen logic inputs for controlling the MG2500 via contact-closures

(see Logic Inputs on pg. 12). Logic Inputs are programmed using

the software and serial cable provided with the MG2500 (see

Setup on pg. 10). NOTE: From the factory, Logic Inputs 1~16

have no pre-programmed function.

Outputs 1 & 2: These plug-in barrier strips provide the balanced

analog line-level Outputs from processor Channels 1 & 2. For

balanced output, wire high to (+), low to (-), and ground to (). For

unbalanced output, wire high to (+) and ground to (), leaving (-)

unconnected. Signal level will be reduced by 6dB when outputs

are unbalanced.

Input: This plug-in barrier strip provides the balanced analog line-

level audio input. For balanced input, wire high to (+), low to (-),

and ground to (). For unbalanced input, wire high to (+) and

ground to both (-) & (). NOTE: The internal pink-noise generator

provides a second input. Input & noise may be assigned in any

combination to the two processing channels (see Setup on pg. 4).

SETUP

MG2500 parameters are all adjustable using the Windows®95/98/NT/2000/XP software and serial cable provided with the unit. The

MG2500 program includes several control screens, which are described on the following pages. Once the software is started (and Comm

Port Configuration is set), the control screens are accessed via the drop-down menus at the top of the opening screen. The Mainscreen

appears whenever an MG2500 file is opened. Gain Matrix #1, Gain Manager, EQ, Gain Matrix #2, & Delay screens are then available from

the Main screen. Logic Definition & Configuration Options screens are also available from the Configure MG2500 menu. The File menu

provides functions such as save, open, download, etc. The Settings menu recalls the Comm Port Configuration screen. The Window

menu arranges the active product screens. The Help menu explains the available adjustments. To install MG2500 Software: Select ‘Run’

from the ‘Start’menu, and enter A:\SETUP. System Requirements: Windows®95/98/NT/2000/XP with 5MB of available hard disk space

(serial port required for ‘on-line’operation).

MAIN SCREEN

The Main Screen is used to adjust MG2500 input/output levels, to access the processing control screens, and to store/recall Presets 1~16.

Adjustments are made with the computer mouse (or keyboard). Input, Noise, Output 1, & Output 2 levels are adjusted by dragging the

corresponding ‘faders’up or down. These are the analog signal input & output circuits. ‘Meters’are provided on each channel to display

input/output levels at specific points along the digital signal processing paths, and at the analog outputs. NOTE: For best performance,

adjust levels so the meters show occasional peaks in the yellow area, but never to the top (red). Output 1 Mute & Output 2 Mute will toggle

the respective output signal on/off, as well as indicate the output muting status. Logic Inputs indicators will light whenever the respective

Logic Inputs are turned on via external remote control (see Logic Inputs on pg. 12). Preset buttons recall the corresponding presets from

non-volatile memory. Presets must first be created & stored by the user (no factory presets). The Store button opens a menu for storing

current settings in any of the Presets 1~16. Presets may be stored and recalled (in total or in part) via remote control (see Logic Input

Definitions screen on pg. 10). The title bar across the top of the Main screen will indicate the Device #, the custom Device Name, and the

model of product being controlled. MG2500 software can operate ‘off-line’(with no product connected) by opening a ‘new’file for the

desired product. The Device # for ‘off-line’files is assigned sequentially as a negative number.

SETUP

GAIN MATRIX #1 SCREEN

The Gain Matrix #1 screen provides a channel-to-channel (2x2) mix matrix, which can be used to adjustthe amount ofInput &Noise signal

being routed to each of the processing channels (Output 1 & Output 2). From the factory, Input 1 is routed to Output 1 only, and Noise is

routed to Output 2 only, providing two independent signal paths. Levels are adjusted by dragging the corresponding ‘faders’up or down.

‘Meters’are provided on each channel to display input/output levels at Gain Matrix #1. NOTE: For best performance, adjust levels so the

meters show occasional peaks in the yellow area, but never to the top (red). Invert allows the phase of each corresponding signal path to

be reversed (180°).

The MG2500 has two basic applications which utilize Gain Matrix #1:

1) Input 1 can be routed to Output 1 and Noise can be routed to Output 2. Each channel of processing is dedicated to either Input 1 or

Noise signal. Switching between Input 1 & Noise signals (to either Output) is then accomplished via Gain Matrix #2 presets (see Gain

Matrix #2 screen on pg. 8). This is effective when only a single output (zone), or two outputs (zones) with independent delay, are required.

2) Gain Matrix #1 presets can be used to switch between Input 1 or Noise signal being routed to either Output. Each channel of

processing is dedicated to a specific Output (zone), via Gain Matrix #2. Separate EQ presets for Input 1 & Noise signals, as they appear at

each output (zone), can also be used. This is effective when two outputs (zones), each with dedicated processing, are required.

Of course, the MG2500 can simply be configured for processing Noise (or Input 1) signal only, at both Outputs.

SETUP

GAIN MANAGER SCREEN

The Gain Manager screen is used to adjust Leveler, Compressor, Limiter & Soft Gate settings for each of the processing channels (Output

1 & Output 2). Threshold adjusts the signal level at which the Leveler, Compressor, & Limiter functions are triggered. Therefore, these

controls determine the amount and type of gain processing to be applied to the signals. The Leveler controls the long-term average signal

level. If the average signal level increases, the Leveler will reduce gain to compensate. If the average signal level decreases, the Leveler

will increase gain to compensate. The Compressor controls short-term peaks in signal level by providing ‘soft-knee’compression, which

automatically varies in ratio from 1.1:1 on signals just slightly above Threshold, to more than 10:1 at full compression. The Compressor

responds to average & peak levels, working with the Leveler to maintain a constant output level. The Limiter controls short-term peaks in

signal level by providing ‘hard’limiting, which establishes an absolute ceiling level. The Limiter provides protection against clipping

distortion, and the chance of amplifier overload or speaker damage, due to sudden transients. From the factory, the default Threshold

settings will provide approximately 6dB of gain reduction on input signals of nominal level. Bypass defeats the individual Leveler,

Compressor, or Limiter functions for that Channel, without changing the actual settings. Soft Gate Bypass defeats a downward expander

circuit for that Channel, which reduces gain 2dB for each 1dB that signal falls below threshold (-30dBu). The Soft Gate gracefully

attenuates background/ambient noise during periods of silence. Bypass GM defeats all Leveler, Compressor, Limiter, & Soft Gate

functions for that Channel, without changing the actual settings. ‘Meters’are provided on each channel to display input/output levels, as

well as the amount of gain reduction, at the Gain Manager section. NOTE: The Gain Manager provides gain reduction even on input

signals of nominal level. Therefore, all subsequent meters will indicate the resultant lower levels. CAUTION: The Gain Manager can

increase gain for lower level signals. Therefore, after all system settings have been adjusted, temporarily bypass the Gain Manager as a

test of system feedback stability. If acoustic feedback occurs, reduce the system amplifier levels or use the MG2500 parametric equalizer

to eliminate feedback nodes, before re-enabling the Gain Manager.

SETUP

PARAMETRIC EQ SCREEN

The Parametric EQ screen is used to adjust equalization for each of the processing channels (Output 1 & Output 2). Up to 28 bands of

equalization, plus high-pass & low-pass filters, are available per channel. NOTE: Parametric & Graphic equalization techniques may be

used simultaneously on the same channel, as long as the total number of bands per channel does not exceed 28. Frequency selects a

center frequency for the current band. Gain selects the amount of cut or boost applied at the center frequency for the current band.

Bandwidth selects the range of frequencies, above & below the center frequency, which will also be affected by the current band.

Frequency, Gain, & Bandwidth may also be adjusted by dragging the cursors shown inside the upper graph area. Dragging the solid dot

affects both Frequency & Gain. Dragging either of the open circles will affect Bandwidth. Add advances to a new parametric filter band (at

1kHz), leaving place-mark cursors for any previous bands. NOTE: Initially, there are no parametric filter bands available for adjustment,

until Add has been selected. Delete erases the current band, and returns to the previous band. Delete All erases all parametric bands.

Bands Used & Bands Available are shown above. The lower graph area shows the cumulative effect of all equalization. Right-clicking

provides a menu of copy/paste functions, which allows settings of the 28 bands, plus high-pass & low-pass filters, to be copied from one

channel to the other, or to another unit. ‘Meters’are provided on each channel to display input/output levels at the EQ section. EQ Mode

selects the Parametric EQ Screen or the Graphic EQ Screen (see Graphic EQ Screen on next page). Low Shelf adds a low-frequency

shelving parametric band. High Shelf adds a high-frequency shelving parametric band. NOTE: Low Shelf & High Shelf bands are NOT

affected by the Delete or Delete All buttons. They may only be deleted by means of their individual check boxes. Bypass EQ defeats all

parametric & graphic equalization for that channel, without changing actual settings

SETUP

GRAPHIC EQ SCREEN

The Graphic EQ screen is used to adjust equalization for each of the processing channels (Output 1 & Output 2). Up to 28 bands of

equalization, plus high-pass & low-pass filters, are available per channel. NOTE: Parametric & Graphic equalization techniques may be

used simultaneously on the same channel, as long as the total number of bands per channel does not exceed 28. Default operation of the

Graphic EQ is 1/3-octave, 28-bands, and ISO standard center frequencies. Therefore, gain for each band can be simply adjusted by

dragging the square cursors up or down inside the upper graph area. Flat erases all graphic bands, setting all faders to the center line.

Right-clicking provides a menu of copy/paste functions, which allows settings of the 28 bands, plus high-pass & low-pass filters, to be

copied from one channel to the other, or to another unit. Bands Used & Bands Available are shown above. The lower graph area shows

the cumulative effect of all equalization. ‘Meters’are provided on each channel to display input/output levels at the EQ section. EQ Mode

selects either Parametric or Graphic equalization (see Parametric EQ Screen on previous page). HPF Slopeenables a High-Pass Filter by

selecting a desired slope. LPF Slope enables a Low-Pass Filter by selecting a desired slope. Once a High-Pass Filter or Low-Pass Filter

is enabled, a square cursor appears in the upper graph area to allow frequency adjustment for that filter. The effect of High-Pass & Low-

Pass Filters is also shown in the lower graph area.NOTE: HPF & LPF are NOT affected by the Flat button. They may only be deleted by

means of their individual menu boxes. Bypass EQ defeats all parametric & graphic equalization filters for that channel, without changing

actual settings.

SETUP

GAIN MATRIX #2 SCREEN

The Gain Matrix #2 screen provides a channel-to-channel (2x2) mix matrix (identical to Gain Matrix #1), which can be used to adjust the

amount of signal being routed from each channel to the other. From the factory, Channel 1 is routed to Output 1 only, and Channel 2 is

routed to Channel 2 only, providing two independent signal paths. Levels are adjusted by dragging the corresponding ‘faders’up or down.

‘Meters’are provided on each channel to display input/output levels at Gain Matrix #1. NOTE: For best performance, adjust levels so the

meters show occasional peaks in the yellow area, but never to the top (red). Invert allows the phase of each corresponding signal path to

be reversed (180°).

The MG2500 has two basic applications which utilize Gain Matrix #2:

1) Each channel of processing is dedicated to either Input 1 or Noise signal, using Gain Matrix #1 (see Gain Matrix #1 screen on pg. 4).

Switching between Input 1 & Noise signals (to either Output) is then accomplished via Gain Matrix #2 presets. This is effective when only a

single output (zone), or two outputs (zones) with independent delay, are required.

2) Gain Matrix #1 presets can be used to switch between Input 1 or Noise signal being routed to either Output (see Gain Matrix #1 screen

on pg. 4). Each channel of processing is dedicated to a specific Output (zone), via Gain Matrix #2. Separate EQ presets for Input 1 &

Noise signals, as they appear at each output (zone), can also be used. This is effective when two outputs (zones), each with dedicated

processing, are required.

Of course, the MG2500 can simply be configured for processing Noise (or Input 1) signal only, at both Outputs.

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