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Listen 4

4MS Listen 4


Four Channel Stereo Mixer
The 4ms Listen 4 Mixer Module features four channels, two of which have a pan pot and two of which have L/R inputs. This utility module features everything you need to mix your modular synth and can even be daisy chained with other Listen 4 Mixers to increase your channel count.

Reliable Mixing
Four channels of stereo mixing, with line, modular, and headphone outputs. The Listen 4 module is an extremely useful utility module. Out of the four channels, two have mono inputs with pan controls and the other two are stereo channels with dual inputs. This provides optimised compatibility with both stereo and mono. If four channels are not enough then you can daisy chain multiple Listen modules.

The Listen 4 features LEDs to indicate clipping, anti-pop, and excessively low noise. If you rely on multiple ins and outs as part of your Eurorack then trust in 4ms to deliver and distribute your signal perfectly, every time.


• Four channel Eurorack mixer
• Headphone output
• Trim pot for clipping light level
• Daisy Chaining
• Anti-pop circuitry


• 10HP Eurorack format module
• 0.98” (25mm) maximum depth (includes power cable)
• 10-pin Eurorack power header

Power consumption

• Maximum values without using headphones jack:
• Main outputs shorted to ground, headphones jack not used, maximum signal levels on all channels
• +12V: 70mA
• -12V: 62mA
• Maximum values in worst-case conditions:
• All outputs including headphone jack shorted to ground, maximum signal levels on all channels
• +12V: 200mA
• -12V: 62mA

Main outputs

• Output type: zero-impedance, compensated for electrolytic capacitor distortion
• Frequency Response: +/-0.2dB max deviation, 10Hz - 20kHz
• Maximum output level: 22.2V peak-to-peak
• Maximum gain of channels 1 and 2: 8.0dB (hard-panned), 3.1dB (center-panned)
• Maximum gain of channels 3 and 4, and INS header: 4.9dB

Headphones jack

• Frequency response: -0.2dB at 20Hz; 0dB at 100Hz to 20kHz (driving 32Ω headphones)
• Maximum voltage (peak-to-peak): 5Vpp