Soundmasking Generator
MG2500 Front Panel
Frequency Response: 20Hz-20kHz @ +4dBu: +0/-0.5dB
Sampling Rate: 48kHz
THD+Noise: 20Hz-20kHz @ +4dBu: < 0.002%
A/D & D/A Converters: 128x oversampled 24-bit sigma delta
Dynamic Range: 20Hz-20kHz: > 100dB
Maximum Gain: 20dB
Input Impedance (balanced): 20k ohms
Maximum Input (balanced): +24dBu
Output Impedance (balanced): 200 ohms
Maximum Output (balanced): +24dBu
Noise Source: Digital random noise with 200 minute repeat time
• Pink-noise & audio input with 2-channel DSP processor-Audio input
designed for paging applications
• Generator spectral purity (±0.1dB @ 0Hz-20kHz)
• Precision pink-noise filtering (-3dB per octave low-pass)
• Extended “non-apparent” 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 for use
with paging input
• 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
• Programming software & serial 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 ULC/UL listed power source
• Five-year warranty
The MG2500 represents the latest technology in digital signal
processing (DSP) engines for sound masking generator/equalizers.
This model features a built-in digital noise generator and one analog
input specifically suited for use as a paging input. (2) independent mix
matrices are provided to allow operation in the following
1. Single channel masking
Digital Filters: 28 (Up to 28 bands of equalization, plus high-pass &
low-pass filters
available per channel.
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.)
2. Dual channel masking
3. Single channel paging
4. Dual channel paging (from single page input source)
5. Single channel mixed paging & masking
6. Dual channel mixed paging & masking
Memory: Non-volatile (no battery required)
Presets: 16
Logic inputs: 16 - Logic Inputs are controlled by switches,
contact-closures, etc. Each
Logic Input may be assigned two func- tions (one for switch
“closed” and one for switch “open”).
Pinking Filter: Flat between 20Hz and 20kHz
Computer interface: RS-232
Chaining interface: RS-232 repeater via RJ-11 cable
Power Consumption: < 15 watts
Dimensions: H 1.75" (44mm) (1 rack space)
W 19" (483mm)
D 7" (178mm)
Weight: 4.5 lbs. (2.04kg)
The MG2500 offers a variety of user selectable filter options including
one-third octave, parametric high/low pass, and high/low shelving
filters. All set-up and operating functions of the MG2500 are
conducted from a PC using software provided for Windows
XP/95/98/NT4. After defining and downloading the control functions
through the PC, the settings will be stored within the unit in nonvolatile memory (no battery required). The MG2500 model features 16
storage memories and 16 preset functions.
* For computers with USB ports only, use a Keyspan high speed USB
serial adapter, part number USA-19HS, for communication with the
MG2500. Supplied 9 pin cable must be used with the adapter.
Specifications subject to change without notice
8641 South Warhawk Road * Conifer, Colorado 80433
TELEPHONE: (303) 670-1099 x 11 / FAX (303) 679-8949
© 2005 AVLELEC Printed in U.S.A. 000305
ATS001309 RevD 3/05 SL9-2016
MG2500 Main Screen
The noise masking processor shall be the
AVLELEC MG2500 The noise masking processor
shall provide a digital pink-noise generator, and a
balanced line-level audio input, and a dualchannel DSP processor, all in a single rack-space
unit. The pink-noise generator shall have a
spectral purity of ±0.1dB from 0Hz to 20kHz with
precision low-pass filtering of -3dB per octave, and
an extended “non-apparent” repeat time of 200
minutes. The DSP processor shall provide two
independent channels of gain management,
equalization, delay, & channel-to-channel
matrixing. Gain management shall include
leveling, compression, limiting, and soft-gating.
Equalization shall be combined 1⁄3 octave &
parametric, plus high/low shelving filters, and
HPF/LPF with variable frequency & slope. Delay
time shall be adjustable for each output, with
automatic distance/delay calculation. Balanced
line-level input & outputs shall be provided on
plug-in barrier strip connectors. Noise, input &
output levels shall be variable, with complete
software level metering capability. Sixteen nonvolatile memory presets shall be available to
store/recall processor settings. Sixteen logic
inputs shall be provided, for remote control via
external contact-closures. Serial & link ports shall
allow RS-232 control, with Windows
95/98/NT/2000 programming software & serial
cable provided. No manual controls shall be
provided. All processor controls & indicators shall
be provided via software graphic interface.
Remote control shall be via RS-232,
programmable logic inputs, or via accessory units
allowing potentiometer or push-button control.
Frequency Response shall be +0/-0.5dB (20Hz20kHz @ +4dBu). THD+N shall be less than
0.002% (20Hz-20kHz @ +4dBu). Dynamic Range
shall be greater than 100dB (20Hz-20kHz @ unity
gain). Power Consumption shall be less than 15
watts. Dimensions shall be 1.75" high, 19" wide, &
7" deep. Weight shall be 4.5 lbs. Warranty
coverage shall be 5-years. The noise masking
processor shall be CE marked, include a ULC/UL
Listed power source, and incorporate AES
recommended grounding practices.
Graphic EQ Screen
Block Diagram
8641 South Warhawk Road * Conifer, Colorado 80433
TELEPHONE: (303) 670-1099 x 11 / FAX (303) 679-8949
© 2005 AVLELEC Printed in U.S.A. 000305
ATS001309 RevD 3/05 SL9-2016
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