Connecting multiple microphones in an MX396 (-BI or -TRI) to a single microphone input

FAQ #3509 Updated August 16, 2012

Question:

Can the microphones in an MX396 (-BI or -TRI) be paralled together to a single microphone input on a mixer (example: SCM268)?  How does this affect the LED?

Answer:

The microphones in an MX396 will work when paralleled together.  This particular wiring arrangement is not optimum, and therefore is not recommended. Here are some suggestions and notes:
 

  • In most cases, paralleling the microphones in an MX396 essentially creates an omnidirectional microphone.  Alternate products, such as the MX393/O (with mute button and LED indicator) or the MX391/O (without mute button and LED indicator) microphones will provide equivalent omnidirectional performance at a better price point.
  • The LED indicator on the MX396 will not illuminate to full brightness when a single microphone input is providing phantom power to all elements.
  • When paralleling multiple microphones, be sure to connect the microphones together so they are operating with the same polarity. This will prevent erratic sound pick-up due to inverted polarity cancellation. Join the "Audio +" wires together and connect to XLR connector pin 2. Connect the "Audio -" wires together and connect to XLR connector pin 3. The cable shield connects to XLR connector pin 1. The color code for the wires is:
    White Mic 1 Audio +
    Green Mic 1 Audio -
    Orange Mic 2 Audio +
    Blue Mic 2 Audio -
    Yellow Mic 3 Audio + (Tri-element only)
    Gray Mic 3 Audio - (Tri-element only)

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