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The 40-C has a scale allowing for 20dB of headroom in 1dB steps. The headroom scale is identical to the AES/EBU Digital Standard.

The Dorrough 40-C is a professional analog loudness meter, designed for modern stereo recording and broadcast requirements, and offering simultaneous average and peak program display, with separate ballistics and lightning-fast response. This meter is equipped with a 40-LED bar graph, allowing for 20dB of headroom in 1dB steps of resolution per LED.


  • Rack or console mounted Analog Loudness Meter with dual dedicated ballistics for simultaneous peak and average readout
  • Microchip processor with accuracy of oscilloscope, ultra-fast response time of 600ms average, virtually instantaneous peak for seamless continuous display of peak/average relationship
  • Individual left and right XLR inputs for stereo mixing applications, +4 dB factory-calibrated
  • Display with 40 LED's providing 1dB resolution per LED
  • Proprietary "C" scale with 20dB of headroom in 1dB steps, identical to AES/EBU digital standard
  • XLR, 6 DIP switches for function assignments, mini 8-pin DIN port out for access to alarm relays, meter mode functions, and peak hold modes, standard with unit
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