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Instant Alarm when your Radio goes silent!

Never miss a Problem with your Radio stream or audio source with the Barix SilenceMonitor solution. Simple to set up and always listening! Manage multiple SilenceMonitor Devices remotely over a Management Portal where you can see the state of all you Radio streams. SilenceMonitor will report any silence to your mobile phone instantly.

Main Features

  • Reliably monitors your audio source 24/7
  • Realtime alerts sent to your smartphone instantly
  • Listen to the last 10 seconds of your stream before it went silent
  • Stereo input monitoring over RCA connectors


  • RCA Stereo input
  • Wide temperature operating range
  • External power adaptor, 100-240VAC, 10W
  • 108x38x78.7mm (4.25×1.5×3.1 inch)
  • Sturdy aluminium case

Cloud and Connectivity 

  • Adjustable sensitivity
  • Requires a subscription


  • Adjustable monitoring level
  • Adjustable time window

What You Need

Analog source

(RCA Connectors)

SilenceMonitor Device (M400 Flexa)


SilenceMonitor App

SilenceMonitor Portal

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Ordering Numbers

  • 2019.9279

    M400 Flexa EU Package

  • 2019.9280

    M400 Flexa US Package

  • 2019.9281

    M400 Flexa UK Package

  • 2019.9282

    M400 Flexa NoPSU Package

  • Paid online

    Silence Monitor Subscription Annual Fee per Device (80 USD)

Documents & Downloads


M400 Flexa Firmware - v1.5.1

Product Sheets