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Four
Switched WhisperTouch™ Impedance Matching Volume Controls
Switched WhisperTouch volume controls provide clear, distortion-free music reproduction for commercial distributed
systems or "Whole House" audio designs.
These volume controls feature impedance-matching (8 Ω versions only) to protect the amplifier and balance the audio
signal, fine-tune level control to adjust low listening levels to the perfect setting, and an easy-grip, low profile knob.
The knob features smooth detents and make-before-break contacts for smooth transition when changing volume
settings. Attenuation is accomplished in 10 steps. All models have frequency response of 20 Hz – 20 kHz (-3 dB, +0).
Units include an on / off switch and indicator light. An internal "smart" relay switch automatically puts speakers
into "stand by" mode making them "available" rather than indiscriminately active when the audio system is pow-
ered on. Simply touching the switch accesses audio. A modest sized indicator light provides quick visual status
– (green=standby, red=active) Models require a separate 18-gauge, 2 conductor stranded cable to power the
internal relay in addition to the loudspeaker cable. An external power supply, PS-M12, is recommended for 1–3
WhisperTouch units, or PS24-20 (See Page 64) for up to 18 units.
For installation, either a backless E.O. box or sealed box with 18 or 20 in3 volume (Carlon® B120A or equivalent)
is required. Standard or Decora plate styles and available colors vary by model – see chart for details. Decora trim
plates not included.
Model
Series
Impedance Voltage Power
Rating
Plate
Style
Type Requires Attenuation
DWS-8(I/W) 8 Ω— 50 watts Decora Stereo, Switched 20 in3 E.O. Box
& Power Supply
10 Steps,
22.5 dB Total
SWS-8I 8 Ω— 50 watts Standard Stereo, Switched
DWSM-15(I/W) —70.7V 15 watts Decora Mono, Switched 18 in3 E.O.Box
& Power Supply
SWS-15W —70.7V 15 watts Standard Stereo, Switched
DSUMS-8W 8 Ω — 25 watts Decora Left, Right, Summing Switched 20 in3 E.O. Box
& Power Supply
SSUMS-8I 8 Ω — 25 watts Standard Left, Right, Summing Switched
Power Supplies for Switched WhisperTouch
PS-M12 Unit is a compact UL-listed 12VDC, 300 mA power supply with a 6' cord. The required input voltage is
120V. Supply includes a 1⁄8" mini-plug for direct connection to the M-1CB4 connector block (powers up to four F-1
flashers) or for use with up to three Switched WhisperTouch™ volume controls.
Model Powers Up To Input Output (Nom.)
PS-M12 3 Switched WhisperTouch 120VAC 12VDC @ 300 mA
DAT Series Atlas Sound offers traditional autoformer controls to provide excellent stereo performance and maxi-
mum speaker-handling capability. Models include positive off and full-power pass through at the maximum setting.
Contacts are make-before-break for smooth transition. Models with 8 Ω impedance are suitable for residential stereo
and voice-coil circuit application. Models for 25V or 70.7V use provide level control in distributed constant-voltage
systems. Single-gang models mount standard E.O. boxes 21⁄2" deep. Includes both white and ivory knobs, inserts and
trim plates.
• Choose DAT8ST to Control Speaker Volume when Impedance Matching is Not Necessary Such as Single-pair
Installations or when Multi-channel Amplifiers are Used for Individual Zones. Combine DAT8ST with a Separate
Impedance-Matching Switching Device (AST Series) to Design a System with Multiple Loudspeaker Pairs.
• Choose DAT35ST70 for Control of Distributed Stereo Zones in 25V / 70.7V Systems.
Model
Series
Power
Rating
RMS / Channel
System Attenuation Insertion
Loss
Plate
Size
Impedance Voltage Per Step Total
DAT8ST (I/W) 50 watts 8 Ω— 3 dB* 30 dB .5 dB 1 gang
DAT35ST70 (I/W) 35 watts — 25V or 70.7V 3 dB** 27 dB .5 dB 1 gang
* Models have two steps of 6 dB before off. Note: Attenuation curve is steeper for a 25V line.
** Models have one step of 6 dB before off.
Note: Decora® is a Registered Trademark of Leviton Corporation.
Atlas Sound WhisperTouch® Volume Controls
DWT / DSUM Series
(Shown with cover plate)
Commercial Stereo Attenuators
DAT8ST
DAT35ST70
