Single Channel Passive Microphone Combiner

The PMC21 is a stand alone microphone level combiner which is the ideal choice for requiring the passive, isolated mixing of two balanced microphone sources to feed a balanced audio output.

The microphone inputs of PMC21 are each isolated from each other. Therefore the unit may be used to mix two separate microphone sources into a single output. There are two switches can be routed the Phantom Power from the mixer to microphones individually.

The balanced output has a Ground Lift switch that is fitted to help combat ground loop. Left side is capacitor linked to ground while right side offers full grounding chassis connection.

The PMC21 professional quality microphne combiner is designed for use in applications where exceptional audio performance is required. 



  • Broadcast quality.
  • Compact Design.
  • Two-way combine.
  • Transformer isolated outputs.
  • Ground difference options.
  • Use of highest quality components.
  • Use of military grade toggle switch.



  Frequency Response 0dB/-0.15dB 20Hz~20kHz
  Maximum Input Level +15dBu, (1% 50Hz)
    +26dBu, (0.1% 1kHz)
  Distortion 0.003% (0dBu, 1kHz)
  Insertion Loss -1.5dB into 600Ω Load
    <0.1dB into 50kΩ Load
  Shorted Input Loss A or B -6dB
  Connections XLR Female Input × 2,
    XLR Male Output,
    Ground Lift Switch,
    Phantom Switch × 2
  Dimensions W41 × H85 × D108 (mm)
  Nett Weight 0.37kg