Shure SCM268 (4-Ch Field Mixer)

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The SCM268 microphone mixer features six transformers inside: four transformer balanced XLR microphone-level inputs, one transformer balanced XLR mic/line output, and one internal low stray field, toroidal power transformer and a rugged half-rack chassis.


  • Six transformers

  • Four transformer balanced XLR microphone-level inputs

  • One transformer balanced XLR mic/line output

  • One internal low stray field, toroidal power transformer


Brand Shure
Model SCM268


Type Analog
Color Black
Channels 4 channels (Balanced XLR Microphone)


Input Connectors 4 x female XLR (Low-Z)
4 x female RCA (Hi-Z)
1 x female RCA (aux)
Output Connectors 1 x male XLR (main - mic/line switchable)
1 x female RCA (aux)

Performance Data

Frequency Response Microphone Inputs: 150 Hz to 20 Khz + 2 dB (built-in 80 Hz low-cut)
Auxiliary Inputs: 20 Hz to 20 kHz + 2 dB
Impedence mic out: 0.2 ohms
Line out: 72 ohms
Aux out: 870 ohms
Signal/Noise Master full counterclockwise: –92 dBV
Master full clockwise: –70 dBV
Max Level (dBu) mic out: -21 dbv
Line out: +18 dbv
Aux out: +7 dbv

Physical Information

User Controls 4 - Input control knobs
1- Aux control knob
1- Master volume control knob
Power 100-120 Vac rated nominal, 50/60 Hz, 60 mA
Dimensions (WHD) 8.60 x 1.72 x 6.37 inches
Weight 2.62 lbs
Construction Metal enclosure

Special Features

Features Six-segment LED output level meter. Phantom Power @ 12 Vdc open-circuit through 340Ω series resistance.


  • XLR Balanced Audio Cable (M-F) x 25'
  • XLR Balanced Audio Cable (M-F) x 50'


  • IEC Power Cord

Patch Cables

  • XLR Balanced Audio Patch Cable (M-F)
  • RCA Phono (Stereo) Patch Cable (M-M)
  • 3.5mm Stereo Mini Jack to 2X RCA Phono (M) Patch Cable