Features Digital Masking Generator: One or Two Channels Three Basic Masking Spectra: Pink, White, Superwhite Low Pass Masking Filter with Variable Cutoff Frequency 22 Active 1/3 Octave Band Masking Equalizers Mixer Inputs: Two High Level and One Microphone Level 6 Active One Octave Band Mixer Equalizers Pre-equalization of Inputs for Ceiling Attenuation 60 Watt Power Amplifier with 70 Volt Output External Input to Amplifier Muting for High Level and Masking Signals 7 Position Zone Level Control Shelf or NEMA Rack Mount: 3 1/2 inches high Colored LED acts as Power On, Level, and Overload Indicator Three Possible Outputs: Masking, Masking + Auxiliary, 70 Volt High Contrast Control Panel

General Applications
The DS101 Series of Sound Conditioners are used to increase Speech Privacy in all office environments while providing paging and music, and all in one compact unit. These Sound Conditioners can be used to drive loudspeakers at any location with the proper acoustical masking spectrum. The mixer section of the units accepts two high level auxiliary signals, such as music and telephone paging, as well as microphone paging. The mixer section permits these signals to have the desired sound spectrum independently of the masking. The masking can be muted for emergency paging, and the high level signals can be muted for priority paging. The output of the power amplifier section is set by the built-in zone level control. These units can drive other amplifiers with its line level outputs.

General Description of Operation
The masking signal is generated and equalized on its own boards with the controls under the cover plate on the front panel. There are no exposed controls for the masking part of the system. The level of the equalized masking signal is set with a volume control and then fed to a terminal block at the rear to feed exterior units, such as mixers, automatic level controls, or power amplifiers. The equalized signal also goes to the mixer boards. The level of each of the three auxiliary inputs is set with independent volume controls, and then they are mixed and equalized. The equalized signal is then mixed with the independently equalized masking signal on the mixer boards. The controls for this board are under the front panel cover plate. The mixed signals are then fed to a terminal block at the rear and to the power amplifier through a switch.

The input to the power amplifier may be from the internal masking or mixer board (depending on the model), or from an exterior source such as an automatic level control or other mixer. This is controlled by a rear panel switch. The input level to the amplifier is set by a seven position zone level control on the front panel. The output of the amplifier board appears at a rear panel terminal strip and is 70V balanced (isolated from system ground).

Masking Generator / Equalizer
The masking generator is a maximal length digital white noise source (pseudo-random noise source). This source has an exceedingly low failure rate and constant voltage output, so it is desirable for standard applications. Since the signal is repetitive, it is a deterministic process. If a truly random signal is required, the DS101 Series should be chosen. If the application is for audio security, the DS102 Series should be used. The white noise output spectrum is altered by the other components of the board to create the acoustical spectrum desired for the application. The board output level is set by a front panel slide switch.

The spectrum is shaped in three steps. The first step sets the base spectrum with a three-position switch on the front panel: Pink, White, Super White. The second step adjusts the base spectrum to achieve a given degree of high frequency roll off with a sliding potentiometer on the front panel. This is accomplished by a low pass filter that has an adjustable roll off frequency from 100 Hz to 10 kHz. The final step is 1/3 octave equalization with sliding potentiometers on the front panel. There are 22 active onethird octave bands with ISO center frequencies from 80 Hz to 10 kHz. Each band has a 19 dB range of adjustment (+10 dB to -9 dB).

The equalized signal is fed to a terminal block on the rear panel for processing through exterior amplifiers. In models with equalizers, the signal is also fed to the mixer boards, or to the power amplifier if there is one. On the DS1010 the signal is also fed to the LED display so output level may be monitored.
All front panel controls are on a high-contrast front plate for better visibility in low light. After all adjustments are completed, this plate is covered to prevent accidental changes.

Model Descriptions
The DS101 Series of Sound Conditioners has 5 models that range from a basic masking generator to a complete medium-sized system. The appropriate model should be chosen for the application to insure minimum cost. Each model may be either rack (R) or shelf (S) mounted. Each is composed of a unique combination of the three basic building blocks: (1) digital masking generator and equalizer; (2) three input mixer and equalizer; and (3) power amplifier:

DS1010R, DS1010S, Masking
This model may be used as the source for a large or very complex masking system.
Weight: 17 lbs. Power Requirements: 5 Watts.

DS1011R, DS1011S, Masking + Mixer
This model may be used as the source for a large masking system that has All-Call Microphone or Telephone paging or general music coverage. It can be used to cover masking only areas as well as areas with all signals.
Weight: 18 lbs. Power Requirements: 7 Watts.

DS1012R, DS1012S, Masking + Mixer + Power Amplifier
This model may be used in the same way as the DS1011 through the auxiliary outputs, but in addition it can be a total masking/music/paging system driving up to 60 loudspeakers (approximately 13,000 square feet).
Weight: 24 lbs. Power Requirements: 157 Watts.

DS1013R, DS1013S, Masking + Power Amplifier
This model may be used in the same way as the DS1010, through the auxiliary output, but in addition it can be a total masking system driving up to 60 loudspeakers (approximately 13,000 square feet.)
Weight: 20 lbs. Power Requirements: 155 Watts.

DS1014R, DS1014S, Two Channels of Masking
This model should be used when two independent channels of masking are required. It replaces two DS1010 units with a unit the same size as one DS1010.
Weight: 18 lbs. Power Requirements: 10 Watts.

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Features Non-Stationary Random Masking Generator One or Two Channels Three Basic Spectra: Pink, White, Superwhite Low Pass Masking Filter with Variable Cutoff Frequency 22 Active 1/3 Octave Band Masking Equalizers Up to 2 Sources of Music can be added Shelf or NEMA Rack Mount: 3 1/2 inches high Colored LED acts as Power On, Level, and Overload Indicator High Contrast Control Panel

General Applications
The DS102 Series Security Masking Generators are designed to provide Audio Security (Secret Speech Privacy) under the restrictive requirements that speech must not be understood by unauthorized persons attempting to listen by either ear or with the aid of listening devices. The standard DS101 or DS103 Series of Sound Conditioners should not be used for these circumstances. The DS102 Series can be used to drive audio amplifiers which in turn can drive either loudspeakers or vibration transducers. The primary function of these generators is to create an audio signal that will not only mask conversations in a room but also make it highly unlikely that the speech buried in the masking can be recovered through signal processing techniques. The DS1020 is recommended for systems that require only masking and use only one type of sound masking device, either loudspeaker or transducer. If both are used, the DS1024 is recommended; it has two independent frequency equalization circuits.
Music can be added as an overlay to the masking as an additional confusing factor. If the non-stationary masking is reduced by some means, the processing techniques will recover the music in lieu of the speech. The DS1021 is recommended for applications where music is required, and only one type of sound making device is used. If both types are used, two DS1021 units are required. These units must be kept in the secure area.

The masking signal is generated on a special board with no external controls. It is then fed to either one or two equalization boards that have controls under a cover plate on the front panel. There are no exposed controls. The level of the equalized masking signal is set with a volume control and then fed to a terminal strip on the rear panel to feed exterior units, such as mixers, automatic level controls, or power amplifiers. If music is added, a high level music source, such as a CD player or radio, is connected to a terminal strip on the rear panel. The level, relative to the masking signal, is set with a graphic control under the front panel cover plate. The music can be equalized independently from the masking. All models operate on 120 VAC 60 Hz.

Masking Generator
The security masking generator creates a unique non-stationary random electrical signal (masking signal). The fundamental signal is created by an analog white noise source with Gaussian amplitude distribution. This signal is stationary random. It is then modified by mixing, in a special way, a second analog white noise source to create a white noise output which is non-stationary random and which strongly decreases the likelihood of a listener recovering a conversation buried in the masking. The random signal is unknowable by the manufacturer, the user, or the listener.

Equalizer
The objective in creating audio security in a room with masking is to reduce the signal/noise ratio
(conversation/masking) to at least zero. To do this the masking level and spectrum must be correct for the specific location of concern. The primary purpose of this board is to set the correct spectrum. Depending on application, one or more of these units may be needed. This unit has a base output level adequate to drive a power amplifier, but the final system level is set by the power amplifier.
The base output level of this unit is set by a front panel slide switch. The spectrum is shaped in three steps. The first step sets the base spectrum with a three-position switch on the front panel: Pink, White, and Super White.

Model Descriptions
The DS102 Series of Security Generators has 3 models. The appropriate model should be chosen for the application to insure minimum cost. Each model may be either rack (R) or shelf (S) mounted. Each is composed of a unique combination of the two basic building blocks: (1) non-stationary analog masking generator and equalizer ; and (2) three input mixer and equalizer:

DS1020R, DS1020S, One channel Security Generator
This model may be used as the source for systems with only one type of sound making device.
Weight: 17 lbs. Power Requirements: 5 Watts.

DS1021R, DS1021S, One Channel Security Generator with Music Mixer
This model may be used as the source for systems where music is to be added for additional protection.
Weight: 18 lbs. Power Requirements: 7 Watts.

DS1024R, DS1024S, Two Channel Security Generator
This model may be used as the source for systems with both types of sound making devices.
Weight: 19 lbs. Power Requirements: 15 Watts.

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Features Digital Masking Generator: One or Two Channels Three Basic Masking Spectra: Pink, White, Superwhite Low Pass Masking Filter with Variable Cutoff Frequency 22 Active 1/3 Octave Band Masking Equalizers Mixer Inputs: Two High Level and One Microphone Level 6 Active One Octave Band Mixer Equalizers Pre-equalization of Inputs for Ceiling Attenuation 60 Watt Power Amplifier with 70 Volt Output External Input to Amplifier Muting for High Level and Masking Signals 7 Position Zone Level Control Shelf or NEMA Rack Mount: 3 1/2 inches high Colored LED acts as Power On, Level, and Overload Indicator Three Possible Outputs: Masking, Masking + Auxiliary, 70 Volt High Contrast Control Panelr

General Applications
The DS103 Series of Sound Conditioners are used to increase Speech Privacy in all office environments while providing paging and music, and all in one compact unit. These Sound Conditioners can be used to drive loudspeakers at any location with the proper acoustical masking spectrum. The mixer section of the units accepts two high level auxiliary signals, such as music and telephone paging, as well as microphone paging. The mixer section permits these signals to have the desired sound spectrum independently of the masking. The masking can be muted for emergency paging, and the high level signals can be muted for priority paging. The output of the power amplifier section is set by the built-in zone level control. These units can drive other amplifiers with its line level outputs

General Description of Operation
The masking signal is generated and equalized on its own boards with the controls under the cover plate on the front panel. There are no exposed controls for the masking part of the system. The level of the equalized masking signal is set with a volume control and then fed to a terminal block at the rear to feed exterior units, such as mixers, automatic level controls, or power amplifiers. The equalized signal also goes to the mixer boards.

The level of each of the three auxiliary inputs is set with independent volume controls, and then they are mixed and equalized. The equalized signal is then mixed with the independently equalized masking signal on the mixer boards. The controls for this board are under the front panel cover plate. The mixed signals are then fed to a terminal block at the rear and to the power amplifier through a switch.
The input to the power amplifier may be from the internal masking or mixer board (depending on the model), or from an exterior source such as an automatic level control or other mixer. This is controlled by a rear panel switch. The input level to the amplifier is set by a seven position zone level control on the front panel. The output of the amplifier board appears at a rear panel terminal strip and is 70V balanced (isolated from system ground). All models operate on 120 VAC 60 Hz.

Masking Generator / Equalizer
The masking generator is a maximal length digital white noise source (pseudo-random noise source). This source has an exceedingly low failure rate and constant voltage output, so it is desirable for standard applications. Since the signal is repetitive, it is a deterministic process. If a truly random signal is required, the DS101 Series should be chosen. If the application is for audio security, the DS102 Series should be used. The white noise output spectrum is altered by the other components of the board to create the acoustical spectrum desired for the application. The board output level is set by a front panel slide switch.

The spectrum is shaped in three steps. The first step sets the base spectrum with a three-position switch on the front panel: Pink, White, and Super White. The second step adjusts the base spectrum to achieve a given degree of high frequency roll off with a sliding potentiometer on the front panel. This is accomplished by a low pass filter that has an adjustable roll off frequency from 100 Hz to 10 kHz. The final step is 1/3 octave equalization with sliding potentiometers on the front panel. There are 22 active one third octave bands with ISO center frequencies from 80 Hz to 10 kHz. Each band has a 19 dB range of adjustment (+10 dB to -9 dB). The equalized signal is fed to a terminal block on the rear panel for processing through exterior amplifiers.

In models with equalizers, the signal is also fed to the mixer boards, or to the power amplifier if there is one. The DS1030 also feed the signal to the LED display so output level may be monitored. All front panel controls are on a high-contrast front plate for better visibility in low light. After all adjustments are completed, this plate is covered to prevent accidental changes.

Model Descriptions
The DS103 Series of Sound Conditioners has 5 models that range from a basic masking generator to a complete medium-sized system. The appropriate model should be chosen for the application to insure minimum cost. Each model may be either rack (R) or shelf (S) mounted. Each is composed of a unique combination of the three basic building blocks: (1) digital masking generator and equalizer; (2) three input mixer and equalizer; and (3) power amplifier:

DS1030R, DS1030S, Masking
This model may be used as the source for a large or very complex masking system.
Weight: 17 lbs. Power Requirements: 5 Watts.

DS1031R, DS1031S, Masking + Mixer
This model may be used as the source for a large masking system that has All-Call microphone or telephone paging or general music coverage. It can be used to cover masking only areas as well as areas with all signals.
Weight: 18 lbs. Power Requirements: 7 Watts.

DS1032R, DS1032S, Masking + Mixer + Power Amplifier
This model may be used in the same way as the DS1031 through the auxiliary outputs, but in addition it can be a total masking/music/paging system driving up to 60 loudspeakers (approximately 13,000 square feet).
Weight: 24 lbs. Power Requirements: 157 Watts.

DS1033R, DS1033S, Masking + Power Amplifier
This model may be used in the same way as the DS1030, through the auxiliary output, but in addition it can be a total masking system driving up to 60 loudspeakers (approximately 13,000 square feet.)
Weight: 20 lbs. Power Requirements: 155 Watts.

DS1034R, DS1034S, Two Channels of Masking
This model should be used when two independent channels of masking are required. It replaces two DS1030 units with a unit the same size as one DS1030.
Weight: 18 lbs. Power Requirements: 10 Watts.

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Features Compact Masking System Analog Masking Source Light Weight & Portable Volume Control Low-pass Filter 12 Foot Power Cord 110-120 Volts: 50-60 Hertz

General Applications
The DS108 Privacy Provider emits a precisely enhanced analog signal that covers, or masks, intelligible
conversation and distractive outside noises within your business environment. There is a volume control and a low-pass filter that can be adjusted to meet your needs for loudness and tone. It is totally portable and weighs 10.2 ounces. It is warm gray in color and is 1 inch high by 3.75 inches wide by 6.35 inches long. It plugs into any standard wall outlet (110-120 Volts: 50-60 Hertz). This UL listed unit comes with a 12 foot power cord and velcro mounting strips (if needed).

General Description of Operation
The DS108 Privacy Provider is designed for small in-room placement where a central masking system is
inappropriate. It can be used in any environment such as: Secretarial Areas, Social Service Office, Human Resources Areas, CPA Firms, financial Offices, Law Offices, “Closing Offices”, Doctor’s Offices, Examination Rooms, Patient Waiting Rooms, Out-Patient Surgeries, Psychotherapy Offices, Dental Offices, Home Offices, Multi-Tenant Apts. & Condos, Dormitories, Bedrooms for Restless Sleepers, Etc. The uses are unlimited. If you do not want to hear others; place the unit by you (the listener). If you do not want others to hear you; place the unit by them. When privacy levels are inadequate between two rooms, place a unit in each room.

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Features Ideal for combined masking, music and paging No controls that can detune the masking signal One or two channels Four inputs: masking, two high level, and one microphone level Muting for all high level signals including masking Six active one octave band graphic equalizers All controls under front panel cover Pre-equalization of inputs for ceiling attenuation Shelf or NEMA Rack Mount: 3 ½” high Colored LED acts as power on, level and overload indicator

General Applications
The DS111 Series of Mixer/Equalizers are specifically designed for use with complex masking sound systems. There are generally four possible inputs to the mixer: the masking sound, a high level music signal, a high level page signal, and a microphone level page. If any combination of these four signals is required, then this unit is perfectly suited for the application. It is particularly suitable for sound made by plenum mounted speakers.

Model Descriptions
The DS111 Series of Mixer/Equalizers has 2 models; one and two channels. The two channel version has two complete one channel units in one compact cabinet. The appropriate model should be chosen for the application to insure minimum cost. Each model may be either rack (R) or shelf (S) mounted.

Each channel can accommodate all four signals in a unique way. The masking is made and equalized in a remote masking generator and connected through a rear panel terminal strip. It is then passed through these models at unity gain and with no changes in equalization. The two high level inputs are connected through a rear panel terminal strip. The microphone signal is connected through an A3M type connector on the rear panel. These three input signals pass through individual graphic level controls and then are mixed. The mixed signal passes through a pre-equalization circuit that removes the frequency dependent attenuation of ceiling panels. The signal then passes through 6 active one octave band graphic equalizers so any overall "house curve" can be obtained. It is then mixed with the masking signal and passed to a power amplifier through a rear panel terminal strip.

For priority paging applications, either one or two of the high level inputs can be muted by wiring a remote switch to the rear panel terminal strip. No remote 24 VDC source is required; switch closure will mute the signal. For emergency paging applications, the masking signal can also be muted in the same way. There is one or two vertical LED Bar Graphs on the front panel which shows the model output. With no output, the lowest Green light is lighted to show power. With an output, the higher Green lights will fluctuate to show output level. With high levels of output, the lights will change to Amber and then Red to indicate overload. Both models operate on 120 VAC 60 Hz.

DS1111R, DS1111S, One Channel
This model may be used as the mixer for one combination of signals. It accepts 4 inputs: masking, music,
telephone page, and microphone page.
Weight: 15 lbs. Power: 4 Watts.

DS1112R, DS1112S, Two Channel
This model may be used as the mixer for two combinations of signals. It accepts 8 inputs. It is two one channel units in one cabinet.
Weight: 15 lbs. Power: 8 Watts.

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Features 120 Watts RMS Output to 70V Line Two Zones at 60 Watts per Zone Four Zones at 30 Watts per Zone 7 Position Stepped Zone Level Control Shelf or NEMA Rack Mount: 31/2 inches high Colored LED acts as Power On, Level, and Overload Indicator One Colored LED Level Indicator per Zone Fused Outputs

General Applications
The DS160 Series of Power Amplifiers is used to supply audio power to any masking, music, and/or paging system. There are five significant differences between these amplifiers and others on the market.

The first is that as many as four zones of speakers can be driven from one compact unit with a different signal in each zone. There are several advantages to this configuration. The size of the equipment is smaller. The system is more reliable because each zone is driven by an independent amplifier. A small office area with widely divergent audio requirements can easily be accommodated; paging may be put into one area, music into another, and masking into yet another, as well as any combination. On high quality masking systems, the number of zones generally is proportional to the number of administrative groups and these amplifiers permit zones of about 7000 Sq. Ft. or 14,000 Sq. Ft. These areas relate to the physical size of most groups.

The second difference is that the level in any zone can be controlled to within 1.5 dB with a stepped rotary switch on the input side of each amplifier. Such precision is not possible on the power side of the amplifier unless expensive transformers are used, and then the frequency spectrum cannot be held constant with transformers as it can with our control. Precision of this degree is required of high quality masking systems. In addition, the owner can alter levels, but because the control is detented it can be returned to a known condition without further measurements. The total range of the switch is limited to 9 dB in order to prevent serious misuse of the system by the owner.

The third difference is that a full range rotary level control is put on the BACK of the unit to permit a full range of output levels, while making it difficult for the inexperienced to use.

The fourth difference is that there is an LED indicator for each zone. The indicator serves three functions:

• Power On Light. Even with no input the lowest level LED is lighted.
• Output Level Indicator. A range of Green LED's show the output level and the fluctuations of the output.
• Overload Indicator. With higher outputs, the lights become Amber then Red to indicate output overload and distortion.
  

The fifth difference is that there is no power switch on the unit. Only the total system may be turned off by
switch or each unit turned off by disconnection.

General Description of Operation
Each unit has either two or four line level inputs on a rear panel terminal strip. These inputs are fed to the rear panel level control and then to the front panel stepped level control. The signal is then amplified and fed to either two or four 70 volt outputs on a rear panel terminal strip. Each output is isolated from system ground and is fed to the level indicators on the front panel. All models operate on 120 VAC 60 Hz.

Model Descriptions
The DS160 Series of Zone Power Amplifiers has 2 models that handle either two 60 Watt zones or four 30 Watt zones. The appropriate model should be chosen for the application to insure minimum cost. Each model may be either rack (R) or shelf (S) mounted.

DS1603R, DS1603S, Two Zone 60 Watts/Zone
This model will drive two zones of up to 60 speakers per zone.
Weight: 25 lbs. Power Requirements: 300 Watts.

DS1604R, DS1604S, Four Zone 30 Watts/Zone
This model will drive four zones of up to 30 speakers per zone.
Weight: 28 lbs. Power Requirements: 300 Watts.

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Features Compact shelf mount unit with Low-Pass spectrum control Terminal Strip and phono connectors for output Twenty-five Watt power amplifier 110 VAC, 60 Hz., Fused

General Applications
The DS1042 Small Masking Source is designed to provide masking in areas up to 5,000 square feet. It is very easy to set-up and operate. It is compact and more cost effective than traditional systems requiring equipment cabinet and separate masking, generator, spectrum adjustment, and amplification.

General Description of Operation
The DS1042 unit contains a masking generator, a low pass filter, a volume control and a 25 watt amplifier. It only takes up seven to nine inches of desk or shelf space. This unit controls the system and should be placed within eight feet of a power receptacle, and where a wire can be led conveniently from the unit to the masking devices. It should also be placed inside the room to be masked. The sound level and spectrum of the masking sound are adjusted by controls on the front of this unit. The masking generator is a CMOS digital white noise source making a pseudo-random signal. The signal is internally shaped to pink noise. The unit is housed in a rugged plastic cabinet, 7 inches square, and 4 inches high. The unit operates on 120 VAC, 60 Hz.

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Features Internal Gaussian random signal Switchable: Pink / White Low pass filter Direct microphone input Three input level controls 40 Watt power amplifier

General Applications
The DS1092 is designed to drive up to 40 loudspeakers (approximately 5,000 square feet for a system with masking, music, and/or paging, or 10,000 square feet for masking only). Any number of these units can be added together to create a large multi-zone system.

A complex multi-zone system can be built by using several units. For example, with three units, masking and emergency paging may be used in the open office; music and emergency paging may be used in an employee lounge; and emergency paging only may be used in a computer room.

General Description of Operation
The DS1092 unit is designed for use in masking systems that incorporate paging and/or music. The unit has three mixing circuits:

• One for an internal masking source.
• A high level input for an auxiliary music input.
• A low level input for a microphone.

The unit is shelf mounted, so it is best used in smaller systems (5,000 to 10,000 sq. ft.). The unit is one-channel, but a two channel system can be made by addition of another unit. The unit can power up to 40 loudspeakers for an average coverage of 9,000 square feet. The unit requires only the addition of loudspeakers to be a complete sound system.

Masking
The unit contains an internal Gaussian random masking source, so no additional masking equipment is needed. The sound masking signal is pre-shaped, so when used with the tone control, a wide range of masking sound spectra can be obtained. The masking can be used for both closed and open office areas. There is a front panel control knob to set masking levels.

Music
The unit has two rear panel inputs. One input is for a high level input, while the other is for a low level
microphone input. All music sources can be attached to the input, such as a leased music line, a FM tuner, or a CD player. There is a front panel control knob to set music levels.

Paging
The unit has two rear panel mounted input barrier strips and one microphone connector jack to accommodate a high or low impedance microphone. There is a front panel control knob to set paging levels.

Overall Use
The three input level control knobs are used to set the levels of relative to each other. Once this is done, the overall sound levels can be set with the front panel Volume Control. It is recommended that the sound masking level be set first with both input and volume controls set to give the recommended masking levels. Next, the music signal should be raised until the level is above the masking level at an acceptable amount. Lastly, the paging level should be set to be above both the other signals.

Controls
Front panel master volume control
Front panel Microphone input level control
Front panel Masking input level control
Front panel Music input level control
Front panel tone control/low pass filter
Front panel lighted On/Off switch
Rear panel switch to choose high or low level AUX input

Power
Input: 120 VAC, 135 Watts Fused
Output: Nominal 40 Watts Rated 35 Watt

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Features Eight Inch Diameter Loudspeaker 1/4, 1/2, 1, 2, 4 Watt Taps 575 Cubic Inch Enclosure 70.7 Volt Transformer Optional Exterior Rotary Switch for Tap Setting

General Applications
The DS1317 is designed for easy and rapid installation into the ceiling plenum of offices with suspended ceilings, so installation labor costs are reduced. When installed, the assembly is invisible, no ceiling penetrations are required, and sound distribution below the ceiling is very uniform. It may be used for any application where superior sound uniformity is required, such as masking sound, paging and music systems. It may be hung vertically upward, vertically downward or horizontally.

General Description of Operation
The DS1317 contains an eight (8) inch diameter loudspeaker, plenum rated (ETL listed to conform with
UL-2043), with a dual cone to handle masking, music and paging signals. The unit has a multi-tap 70.7 Volt transformer with 1/4, 1/2, 1, 2, and 4 Watt taps so each loudspeaker can be individually adjusted. The transformer is factory installed. The DS1317RS option has a rotary switch on the exterior to make the tap settings easily changeable. The cylindrical enclosure is a premium sized 575 cubic inches. The unit has a mounting bracket already connected. The unit has a 3/8" cable connector mounted on the enclosure for cable termination.

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Features Two Channels (signal inputs) Field Program Level Changes Operates over Five Day Period and Weekends Rack Mounted Battery Backup for Clock during power outages

General Applications
The DS1402 Automatic Level Control unit may be used to maximize acceptability of masking sound in all
masked areas by controlling the masking, paging or music levels automatically to fit the time varying needs of the occupants. This unit is used in centralized masking systems. Typical applications are in professional offices where the staff works late in sparsely populated areas or where security guards tour the offices outside normal working hours. In both cases reduced levels of privacy are required.

General Description of Operation
This unit accepts high level signals from masking generators, phone paging lines, mixers, and music sources. The outputs are then fed to power amplifiers. This model has two attenuation programs that can be programmed separately. Each programmed is field set to provide from 0 to 10 dB attenuation throughout a five day week and a fixed 5 dB attenuation over the weekend. Should the need for change in the program arise, it can be easily reset. The maximum output of the unit has unity gain or zero attenuation; this is typically during the working day. At other times the unit attenuates the signal relative to this maximum value. For example, on the standard program night levels are 10 dB lower, and weekend day levels are 5 dB lower.

This unit has a digital clock face that is programmed with front panel controls. The clock reads in 12-hour time (a.m. and p.m.). There is a Fast and Slow time update and the Day-of-the-Week update. Should the power fail, the battery will maintain the correct time of day. It has an approximate life of ten years. During power outage the clock display is NOT lighted. All models operate on 120 VAC 60 Hz.

This unit has an automatic level control unit with two controls and two signals. The signal to be controlled can be masking, music, paging, or any combination of them. Typical use of this two channel unit is to program each channel for two specific operational requirements that differ by typical operational time, for example: 8 am – 5 pm and 7 am – 7 pm. This model is used to vary the level of two signals automatically and independently.

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Features 15 Amp Capacity with Circuit Breaker Six Dual Receptacles Rack Mount, 1.75 Inches High Surge protected

General Applications
The DS1920 Power Strip is a general purpose receptacle unit that may be used with any rack mounted audio equipment. It is rack mountable, and 1 3/4 inches high so it is easy to insert plugs when sandwiched between two deep units. There are three double receptacles so that six devices may be plugged into it. The unit is black with black plugs. It has a rocker switch for control power to all the receptacles, a circuit breaker, and is surge protected.

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