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Marshall Electronics Keeps Broadcasters CALM and EBU Compliant  with Latest Generation of Audio Monitors
Posted on Monday, August 26, 2013
 El Segundo, CA –  Marshall Electronics introduces 16 Channel Digital Audio Monitors with 1RU or 
2RU Mainframes equipped with features to help broadcasters comply with CALM and EBU 
regulations. The AR?DM21, AR?DM21?B, AR?DM22?B and AR?DM22?L provide timely visual, 
audio, and email notifications of noncompliant signals.  
 
Beginning in December 2012, the CALM Act requires TV stations, cable and satellite TV 
operators in the U.S. to limit a commercial’s average volume to that of the accompanying 
program. Marshall’s audio monitors are designed to meet the rules outlined in the CALM Act 
with automatic logging of non?compliant signals plus three different automatic indicators. The 
audio monitors can be programmed to support EBU audio loudness standards. 
 
The automatic indicators are designed to assist operators to quickly identify non?compliant 
signals in a real world working environment.  Visual alarms, tone alarms and auto?email 
notification support operations even when operators and engineers are focused on something 
else.  “Auto?email allows remote engineering management to receive immediate notification 
whenever and wherever they are located,” explained Director of Strategic Planning Russ Walker.   
“These CALM features are designed with operations in mind to allow for efficient work flow in a 
control room environment.“ 
 
Each AR?DM audio monitor supports 16 audio channels with four slots available for 
interchangeable input / output modules. These units also provides pristine audio quality and 
unrivaled flexibility with 100% digital processing, Class D (digital) amplification, selectable stereo 
down?mix modes, Dolby® Digital / Dolby® E decoding capability (with optional ARDM?D552 
module), a  headphone jack with Level control, and an RS?485 port for on?site firmware 
upgrades.  
 
The AR?DM21 is a 16 Channel Digital Audio Monitor with 1RU Mainframe. The AR?DM21?B has 
the addition of tri?color LED bar graphs.  
 
The AR?DM22?B is a 16 Channel Digital Audio Monitor with 2RU Frame and Tri?Color VU/PPM 
20?Segment LED Bar Graphs. The AR?DM22?L offers Dual High?Resolution LCD displays capable 
of displaying meters, metadata, and channel status.