Basic operation of the AR-DM21 Audio Monitor involves selecting an input module as the audio source, monitoring signal presence using 16 LEDs, and choosing a mode in which to monitor audio through the stereo speakers. The user can switch between up to four installed I/O modules, each providing up to 16 channels of audio. The 16 Channel Presence LEDs immediately display signal presence for all channels. Finally, audio channels from the selected module can then be monitored through the stereo speakers in a variety of ways: Any single channel can be monitored in mono, any channel pair can be monitored in stereo, and any group of eight channels can be down-mixed to stereo using a variety of configurations.

• Only 1RU (1.75")
• 16 LED Indicators for channel presence
• User-configurable with a variety of modules
• 100% Digital Processing
• Class D Audio Amplification
• Dolby® Digital / Dolby® E Decoding (with optional ARDM-D552 module)
• Selectable Stereo Downmix Modes
• USB 2.0 Port enables on-site firmware upgrades
• Ethernet port allows remote alarm monitoring
• Balance and Volume Control
• 1/4" Headphone Jack

The AR-DM21 is ideal for TV facilities, studios, post production, VTR bays, mobile production vehicles, satellite links, and wherever multichannel audio monitoring is required. The AR-DM21 supports 16 audio channels with four slots available for interchangeable input / output modules. This unit also provides pristine audio quality and unrivaled flexibility with 100% digital processing, Class D (digital) amplification, selectable stereo downmix modes, Dolby® Digital / Dolby® E decoding capability (with optional ARDM-D552 module), a ¼” headphone jack with Level control, and an RS-485 port for on-site firmware upgrades.

The AR-DM21 also provides LED indicators for monitoring signal presence and system status. Both VU and peak metering are supported. Channel, Group, Mix, Dolby®, and Balance selection, and saved configurations are easily accessed via the system’s large navigation buttons. For audio playback, the AR-DM21 provides two magnetically-shielded loudspeakers in a compact 1RU design.

Marshall Electronics 16 Channel Digital Audio Monitors are equipped with features to help broadcasters comply with CALM and EBU loudness regulations. The monitors provide timely visual and audio alerts, email notifications and complete logging of noncompliant signals.

ARDM-HDSDI

• Multi-Rate SDI/HD-SDI Video Input (Auto-Detect)
• Re-Clocked SDI/HD-SDI Loop-Through Output
• SDI: SMPTE 259M-C / HD-SDI: SMPTE 292M
• Supports 8 Stereo Embedded Channels or Dolby®
• Multi-Channel Decoding*

$539.00*

ARDM-AES-BNC

• 4 Unbalanced AES/EBU Inputs (BNC)
• 4 Passive Loop-Through Outputs (BNC)
• Supports 4 Stereo Channels or Dolby® Multi-Channel Decoding*

$539.00*

ARDM-AES-XLR

• 4 Balanced AES/EBU Stereo Inputs (DB-25)
• 4 Passive Loop-Through Outputs (DB-25)
• Break-Out Cable included (DB-25 to 8 XLR)
• Supports 4 Stereo Channels or Dolby® Multi-Channel Decoding*

$539.00*

ARDM-AA-8XLR

• 8 Balanced Analog Audio Inputs (DB-25)
• Nominal level: 0,+4,+6, or+8 dBu = -20dBFs
• Break-Out Cable included (DB-25 to XLR)

$539.00*

ARDM-AA-2OUT

• 2 Balanced Analog Audio Outputs
• Nominal level: -20 dBFs = +8 dBu
• Excellent for on-the-fly 2-channel monitoring

$539.00*

ARDM-AES-4OUT

• 4 Unbalanced AES/EBU Outputs (75Ω BNC)
• Capable of 4 AES/EBU Outputs
  De-embedded from HD-SDI or SD-SDI input
• Capable of 4 AES/EBU Outputs Decoded
  from Dolby® E / Dolby® Digital bitstream*

$539.00*

ARDM-D552

Dolby® E/Dolby® Digital Decoder Module
Required for multi-channel decoding

Dolby and the double-D symbol are registered trademarks of Dolby Laboratories