Single Channel Passive LINE Combiner

The PLC21 is a stand alone line-level combiner which is the ideal choice for requiring the passive, isolated mixing of two balanced line-level audio sources to feed a balanced audio output.

The input circuits of PLC21 are line-level and are each isolated from each other. Therefore the unit may be used to bridge a balanced stereo source without affecting the stereo separation. The output from the PLC21 is a mono mix of the stereo signal. The PLC21 may also be used to mix two separate sources into a single output.

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

The PLC21 professional quality line-level 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 +20dBu, (1% 50Hz)
    +28dBu, (0.1% 1kHz)
  Distortion 0.002% (0dBu, 1kHz)
  Insertion Loss -2.5dB 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
  Dimensions W41 × H85 × D108 (mm)
  Nett Weight 0.45kg