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ASP-MG24
Sound Masking Generator / Speaker Processor
ASP-MG24 / ASP-MG24TDB
• Four White / Pink Noise Generators & 2 Mic / Line Inputs with 4-Channel DSP Processor
• Generator Spectral Purity (±0.1 dB @ 0Hz – 20 kHz)
• Precision Pink Noise Filtering (-3 dB 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
• High Pass Filter & Low Pass Filter 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
• Independent Matrixes for Channel-To-Channel Mixing
• Variable Noise, Input, and Output Levels with Software Metering
• Thirty Non-Volatile Memory Presets Store / Recall Settings
• Balanced Inputs & Outputs
• Programming Software Included
• No Manual controls on Front Panel, to Prevent Tampering
• Remote Control via USB, RS-232, Ethernet & Accessory Control Panel
• Incorporates AES recommended grounding practices
• UL / ULC Listed External Power Supply
ASP-MG24 represents the latest technology in digital signal processing (DSP) engines for sound masking generator/
equalizers. This model features 4 built-in digital noise generators and two analog inputs specifically suited for paging
input sources. These inputs can be configured for mic or line level.
The ASP-MG24 advances sound masking control to a whole new level while providing the secondary benefit of
loudspeaker processing for the most popular Atlas Sound loudspeaker systems.
The ASP-MG24 is a 1 RU, 6 input x 4 output DSP configurable by a very intuitive set-up GUI. Four inputs are tied
to independent white / pink noise generators with adjustable ramp-up time to allow gradual acclimation to masking
levels. Two additional inputs are available for mic or line sources to allow paging and/or music sources to be blended
with the masking sources to any of the 4 outputs. This 6 x 4 mix matrix provides the following configuration options
for sound masking systems:
1. 1, 2, 3, or 4 Channel Masking
2. Dual Two Channel Masking
3. Single Channel Paging
4. Dual Channel Paging (From Single Page Input Source)
5. 1, 2, 3, or 4 Channel Mixed Paging & Masking
6. Dual Channel Mixed Paging & Masking
Dedicated 1⁄3 octave filter sets are available for each of the 4 generator outputs, 8 band parametric EQ blocks along
with dynamic control is available for each of the two mic/line inputs. Any mix of all 6 inputs may be easily matrixed to
the 4 output DSP blocks for additional parametric equalization, delay, and limiting (if required).
Factoring in all features, a very complex 4-zone sound masking system can be easily configured with 2 external music
or page sources.
For loudspeaker control functionality, the ASP-MG24 may be configured in 2 input x 4 output mode for stereo full
range. Other configurations include full range plus sub operation with Atlas Sound FAP Series ceiling speakers, SM
Series surface mount speakers, or AH Series stadium horns for complete control of crossover types, equalization,
delay, and dynamic control.
Computer interface is simplified by USB or RS-232 connection (no awkward USB to Serial adaptors required!).
External UL / ULC Listed international voltage power supply is included.
ASP-MG24TDB
ASP-MT24TDB incorporates all the features of the standard model with the addition of time / date level control of
all 4 masking inputs for holiday and weekend scheduling. This powerful scheduling tool insures maximum speech
privacy in facilities that may be more or less densely occupied during various times of the day or days of the week.
Ethernet control functionality is also incorporated into this model to provide control of multiple units (up to 32) via a
standard network switch and also allows remote access and monitoring via LAN.
Model Computer
ASP-MG24
ASP-MG24TDB
Interface
USB & RS-232
USB, RS-232,
& Ethernet
Processor Dynamic
32-bit
(40-bit extended)
32-bit
(40-bit extended)
Range
115 dB
(unweighted)
115 dB
(unweighted)
Power Supply
115V 20 watts
UL External Power Supply
115V 20 watts
UL External Power Supply
Dimensions
Height: 1 RU (1.75" 44 mm)
Width: 19" (483 mm)
Depth: 8" (203 mm)
Height: 1 RU (1.75" 44 mm)
Width: 19" (483 mm)
Depth: 8" (203 mm)
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Sound Masking Generator / Speaker Processor
ASP-MG24 Main Screen
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ASP-MG24 Equalizer Screen
Sound Masking Design Assistance from Atlas Sound
Need assistance in specifying a sound masking system?
Atlas Sound now provides support services to assist dealers in product selection and masking speaker layout.
Contact tech Support for details.
Did You Know...
Consultant on Sound Masking for Atlas Sound – Dr. Robert Chanaud
Dr. Chanaud received his B.S. in Engineering from the U.S. Coast Guard
Academy, his M.S. in Engineering from the University of California, and his
Ph.D. in Engineering from Purdue University. His areas of specialization are
acoustics and fluid mechanics. He has been active in the field of acoustics
since 1958 and has extensive experience in office acoustics. As a faculty
member, he has taught both undergraduate and graduate acoustics at the
University of Colorado, the University of Michigan, Brigham Young University,
and Purdue University. He has been a consultant on noise problems to the
IBM Corporation, the Environmental Protection Agency, and the AmericanStandard Corporation. He has authored several masking software programs
including SCOPE, which provides detailed speech privacy analyses of
planned open and closed offices under a variety of conditions. The program
also is used to evaluate the privacy of existing offices and is used to provide
the optimum background sound. As a consultant to Atlas Sound, he has been
instrumental in developing new products for sound masking applications
including the ASP-MG24.
Dr. Chanaud owns a number of patents and has authored many technical
articles on office acoustics and masking sound systems. You can find many of these articles as well as information on
Chanaud's soon to be published book on Sound Masking at AtlasSound.com
Steve Brooks
Tech Support Manager
800.876.3333 x1374
800.876.3333
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GPN1200B
EQM131
Sound Masking Generators & Equalizer
General Purpose Generator
GPN1200B Digital generator with switchable output produces pink or white noise for application in sound masking
systems and for system equalization and audio equipment testing. Output level is .3V into 600 Ω (-8dBm) for matching
input circuits of most commercial equalizers and amplifiers. Low-pass filter shapes frequencies from 16 kHz to 250 Hz
at 12 dB per octave. Self-contained unit with built-in power supply operates at 117VAC at 60 Hz and includes replaceable fuse, 1⁄4" phone jack and screw-terminal output connections. Chassis with rear-mounted controls is 19" width x
1 RU (13⁄4") H rack panel and finished in black semi-gloss epoxy.
1
/3 Octave Equalizer
The EQM131 will provide basic system equalization for sound masking or general public address applications at an
amazingly affordable price.
The 1 RU EQM131 is easily connected to any system via rear panel balanced TRS and XLR jacks. Unbalanced RCA
connections are also provided for use with -10 dBV equipment. Front panel mounted Low Pass Filter / High Pass
Filter and level controls are provided along with a switch for ±6 or ±12 dB operation and 31 sturdy 20 mm filter slide
controls. The ISO centered 1⁄3 octave bandwidth-constant Q filter design minimizes interaction between filters yet is
still wide enough for creation of correction curves.
When used with the Atlas Sound AA120M mixer amplifier and AA-SMG sound masking module, the EQM131 can be
used to create a 1⁄3 octave masking spectrum which is fed directly to the AA120M amplifier section. Paging or music
inputs can receive high frequency shelving equalization for better intelligibility from the AA120M front panel controls.
The page / music inputs and masking module output can then be summed without affecting the masking source
spectrum equalized by the EQM131.
The Masker – Self-Contained System
AM1100-LH
AM1100 Series Complete self-contained masking unit is suitable for applications where distributed constant-voltage
systems are not practical. Economically priced unit provides confidentiality and can be installed above or below the
ceiling (as field conditions require). System could be used in individual office areas, common waiting areas and professional offices where confidential conversations occur. The equalized masking sound lowers intelligibility and masks
disruptive outside sounds.
System is available in 117VAC and 16VAC versions. AM1100-LH includes a built-in power supply, AM1100-16VH
requires external power supply, PS16-40AC. Both offer digital pink noise generator, 2 watt amplifier, 4" loudspeaker
with 10 oz ceramic magnet and selection of installation and operational features described below. All components are
packaged within a specially designed 6" (152 mm) metal cube enclosure featuring one-point suspension to allow 360˚
positioning capability. Controls include power switch, screwdriver-adjust master volume control, attenuator with 1.5
dB per step, and two screwdriver-adjust low pass filters. For convenience, sound output curves have been calculated
and shaped at the factory (specially designed curves to meet customer specifications are available). 117V models
include tranformer with IC electronic regulator and resettable circuit breaker. 16V versions include 8" leads for connection to external power transformer. The following options are included on specified models: (L) AC line cord with
molded plug, (H) 4' suspension chain with "S" hook. Listed under UL Standard 1480.
Also available: PS16-40AC. 16VAC power supply - will power up to seven AM1100-16VH Maskers.
Model Power Requirements Description
AM1100-LH
AM1100-16VH
117VAC, 60 Hz Masker with line cord and chain
16VAC, 60 Hz @ 350 mA Masker with chain
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Sound Masking Loudspeakers
Suspension Mount Sound Masking Loudspeakers
M1000 The masking speaker assembly is designed to accurately reproduce the needed spectrum of masking signal
into the plenum space. The innovative 712 in3 square enclosure ensures ample low frequency response. A specially
designed 8" dual cone loudspeaker is included in the package. A high effi ciency 70.7V internal transformer is coupled
to an external selector switch for easy system tuning. For more precise adjustments, a wide selection of wattage taps
ranging from .25 to 4 watts plus an off setting are provided.
The exclusive Atlas Sound EZ hang brackets simplify installation. This innovative suspension system utilizes two
collapsible galvanized hangers confi gured to allow quick upward or side fi ring installation. The hangers are factoryinstalled on the unit and fold fl at for shipping. To meet most any local code requirement, the M1000 includes an
innovative cover containing both knockouts and a strain relief. This system will allow the use of rigid of fl exible conduit
(if required) and easily accommodates "through" connections on the removable plate.
M1000 is fi nished in neutral black.
M1000-W is fi nished in neutral white and includes a transformer bypass setting on the tap selector switch for 8 Ω
direct-coupled use. This unit is perfect for use in light colored open plenum environments or with masking systems
powered by VARIZONE Performance-Line Programmable Amplifi er Modules (PAM's).
UL 1480 & 2043 listed
Also available optional suspension chain kit, MCHAIN72, 72" chain with two "S" hooks.
T-Bar / Channel Support Sound Masking Loudspeaker
M812-S2T7-BX-RS Loudspeaker/enclosure masking assembly helps maintain a successful acoustic environment in
open plan and partitioned offi ce designs with T-Bar supported ceiling systems. Unit includes square enclosure with
upward sound dispersion, 8" loudspeaker with pre-mounted 70.7V transformer, channel support rails, rotary switch
wired to transformer primary, BX style conduit box complete with 1⁄2" conduit knockouts and all necessary mounting
hardware. 529 in3 enclosure is fi nished in black epoxy and acoustically treated with undercoating and fi berglass to
absorb resonance associated with high-frequency sound transmission. Transformer is supplied with .5, 1, 2, and 5
watts primary taps. Unit also may be used in access fl oor masking systems.
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M1000
Security Masking
The M2000-SM is designed for security masking applications where disruption of planar surfaces is required to thwart
laser microphone sensors. Surfaces where masking might be considered would include: windows, doors, walls, ducts
or any fl at surface.
The unit is a two-part assembly (not sold separately) consisting of a transducer / enclosure and an external transformer interface. The transducer employs NXT™ exciter technology with a 1" plate mounted coil housed in a discrete,
high impact plastic enclosure with 10' insulated lead wire for termination to the external transformer. Enclosure
includes pre-installed 3M™ "peel and stick" adhesive for simple, quick installation to most any fl at surface. Transformer
assembly includes .25, .5, 1, 2, & 4 watts @ 70.7V with simple "keyhole" slots for remote mounting.
Model Transformer Taps Mounting Tab Holes Transducer Dimensions Transformer Housing
M2000-SM .25, .5, 1, 2, & 4 watts 4" On Center 2.5" Square (64 mm)
The M2000-LP is designed for use in access fl oor systems or other low height areas where sound masking sources
might be concealed. (For access fl oors or plenum spaces exceeding 12" the M1000 masking speaker is recommended) The CRS chassis houses two, 2" x 4" side fi ring paper cone speakers and 70.7V transformer with available
taps of .25, .5, 1, 2, and 4 watts (plus off) adjustable via a front mounted switch.
A ROMEX® style strain relief clamp secures two 18-gauge color-coded leads and two wire nuts are provided for
termination.
Model Transformer Taps Sensitivity Frequency Response Height Width Depth
M2000-LP .25, .5, 1, 2, & 4 watts
& Off
90 dB 250 Hz –3 kHz (±5 dB) 25/8" (67 mm) 7.5" (191 mm) 7" (178 mm)
1" Height (25 mm)
Dimensions
3.5" Square (89 mm)
2.25" Height (57 mm)
M812-S2T7-BX-RS
M2000-SM
M2000-LP
800.876.3333
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