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AtlasIED AT100-RM

100-watt rack-mounted attenuator

Item # 978AT100RM

California customers:
Please click here for your Proposition 65 warning.

Need help?
Contact our Virginia-based experts.
In stock
$33.99 each

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Need help?
Contact our Virginia-based experts.

About the AtlasIED AT100-RM

This rack-mounted attenuator is designed for use in a distributed audio system. Contact points are silver plated to help eliminate the static and noise lesser volume controls can produce when the dial is turned. Up to six AT100-RM attenuators can be installed in the Atlas Attenuator Rack Mounting Plate (not included).

Note: this is a mono volume control intended only for use with commercial amplifiers.

Product highlights:

  • skirted black attenuator knob compatible with rack-mounted commercial audio gear
  • 100-watt power rating
  • mount up to 6 attenuators on Atlas Attenuator Rack Mounting Plate (not included)
  • 27dB total attenuation
  • UL-rated for safe in-rack use
  • this is a mono volume control intended only for use with commercial amplifiers
  • 1-3/4"W x 2-3/4"H x 2-1/2"D
  • weight: 1.5 lb.
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # AT100-RM

What's in the box:

  • One 100W rack-mount attenuator (black)
  • 4-Pin Euroblock (Phoenix) connector
  • Dial-scale overlay with 3M adhesive backing

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Crutchfield response

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More details on the AtlasIED AT100-RM

Russ B.

Product Research


Overview: The Atlas AT100RM is a high-quality, rack-mountable volume attenuator rated for up to 100W. The AT100RM works with both 25- and 70-volt commercial systems, and is designed to be rack mounted. The attenuator features ten click-stop positions, plus Off, and includes an adhesive dial-scale overlay with 0 - 10 increments marked around the perimeter.

Optional Rack Plate: The Atlas ATPLATE-052 (sold separately) is a 2U high, 19" wide rack-plate that can accommodate up to 6 Atlas RM series attenuators.

Auto Transformer: The AT100RM commercial volume control features a high-quality auto transformer with excellent frequency response, low insertion loss and reliable performance. Attenuation is accomplished in steps of 3dB each, plus a positive Off position, for a total attenuation of 27dB. To prevent switch damage, there is no stop between the maximum and Off position. The contacts are silver-plated to eliminate noise and contact loss.

Wiring: The Atlas AT100RM has a removable 4-pin Euroblock (Phoenix) connector with wire terminals accepting up to 16AWG stranded wire. Two terminals are used for the connection to the connected speaker(s) and the other 2 terminals provide the input from the amplifier.


  • Power Rating: 100 watts
  • Attenuation Per Step: 3dB
  • Total Attenuation: 27dB
  • Insertion Loss: 0.6dB
  • Resistance: none
  • Dimensions:
    • Width: 1.77"
    • Height: 2.63"
    • Mounting Depth: 2.53"
    • Total Depth: 3.22" (front of knob to back of unit)
  • Shipping Weight: 1.5 lbs.

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