Messaging and Call Stacking System


The Bogen BOMDMU is a comprehensive system that combines page stacking, feedback elimination, pre-recorded messaging, and background music control in a single device.

Feedback Eliminator: The BOMDMU makes feedback through the paging system virtually impossible by opening the loop between the input microphone and speakers. This eliminates the potential for acoustic feedback while giving the user flexibility in the way pages are broadcast.

Page Stacking: For busy overhead paging systems, the BOMDMU offers 3 channels of page stacking and feedback elimination. Each channel can record and temporarily store up to 16 pages or 4 minutes of audio. Page input channels can record simultaneously, and while the system is playing.

Priority Paging: For emergencies, the BOMDMU offers a priority input that overrides the stacking and messaging functions and provides immediate, real-time access to the paging system.

Pre-recorded Messages: For security and general public address messaging, a pre-recorded messaging sub-system has been included. Access both Record and Play functions of up to 99 messages/ 8 minutes of audio from an extension on your host telephone system. Ten (10) start contacts have also been provided to trigger messages from external devices such as sensors or alarm systems.

Background Music: To keep everything in harmony, the BOMDMU also includes a background music input. This allows playback of your favorite music source over the paging system. When a page or


  • Audio
    • Bandwidth 100 Hz to 8 kHz
    • Page Input 3, RJ12 connector, Station Port/Dry Loop/Loop Start
    • Priority Input 1, RJ12 connector, Station Port/Dry Loop/Loop Start
    • Messaging Input 1, RJ12 connector, Station Port/Dry Loop/Loop Start
    • Background Music Input 1, RCA, unbalanced, Line level input with level control
    • Page output 1, RJ12 connector, 8-ohm power/600O line level (switch-selectable), adjustable
  • Page Stacking
    • Message repeat play one or two times, DIP switch selectable
    • Delay between messages 1s, 3s, 5s, 10s DIP selectable
    • Stack up to 16 messages per input
    • DTMF Store/forward (0,2,3 or 4 tones) DIP selectable
    • Pre-Page Tone DIP selectable
  • Power
    • Power Supply (Included) 12V DC/1 Amp
  • Memory
    • Type FLASH
    • Page Stacking 4 minutes per page input channel
    • Messaging 8 minutes total
  • Message Control
    • No. of messages 99
    • Record Control DTMF control from messaging input
    • Play Control Triggered from DTMF on messaging input or AUX Interface start contacts (10)
  • Page Control
    • Priority Control contact is offered on the Priority Input RJ12 connector
    • Page Inputs 3, Page Input RJ12 connector. Each input answers (loop, audio sense, DTMF)
  • Status Outputs (Solid State Relay contacts 24V DC @ 100mA max.)
    • Playing Contact Offered on the Page Output RJ12 connector
    • Record Contact Offered on each Page Input RJ12, as well as the Message Input RJ12
    • Playing, Busy, & Recording Offered on AUX Interface
  • Unit
    • Chassis: Rack mount (1RU)
    • Material: 18 gauge cold rolled steel, painted with silkscreen
    • Dimensions: 17-5/8" W x 1-3/4" H x 6-7/8" D
    • Weight: 7lb
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