ETS SMM4 4 Channel Microphone Mixer, Zone expander

Brand: ETS
Part Number: SMM4
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  • ETS SMM4 4 Channel Microphone Mixer, Zone expander
  • ETS SMM4 4 Channel Microphone Mixer, Zone expander
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ETS SMM4 4 Channel Microphone Mixer (zone expander)

Powers and mixes the audio of up to 4 Sound Surveillance tm microphones into one un-balanced line level RCA (or 3.5mm) output. Use to expand the coverage of one zone using up to 4 microphones or monitor up to 4 separate zones mixed together.

The SMM4 is a 4 channel simple microphone mixer designed to expand the area of coverage of a large area to be monitored. It can be used directly with DVRs, I/P cameras or can be connected directly to ETS base stations. Note- the audio output of the SMM4 is “line level″ (0db).

Key Features:

  • Standard RCA or 3.5mm jack for connection to DVRs etc.
  • Line level (0db) output level.
  • Euro-style connectors makes cable terminations fast and clean.
  • Separate volume control for each microphone.
  • LED power indicator.
  • Power:12 VDC @ 10mA
  • Reverse polarity protected.
  • All power circuitry and cable runs protected with auto-reset type fuse.
  • Black plastic ABS housing.
  • Dimensions: L 4.3 x W 2.7 x H 1.6
Packing List:
  • SMM4 Microphone Mixer.
  • 12 VDC AC adapter.
  • 1 each 3' RCA or 3.5mm patch cable.
  • Installation instructions.


All of ETS items are special built to order items. The moment the order is sent to ETS, they will start production/building. This will take around 1-2 weeks depending on the line of production, volume of your order, etc. Please plan accordingly. We will enter tracking as soon as it becomes available to us. If you have any questions feel free to contact the customer service team at or call us at 214-948-1300 x 411.


Datasheet ets-SMM4-A1.pdf

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