4MS Listen Four

Basic Features:

• Four input channels (two with stereo inputs, two with mono inputs and a Pan knob)
• Headphone and main 1/8" outputs, each with separate Level knob
• Line level output driver with zero impedance, capable of driving long cables
• Output can be switched between line and modular level
• Low noise, cross-talk, and bleed-through
• Anti-pop feature that silences pops and thumps when the power is turned on
• Headers in back allow for connecting to other Listen Four or Listen Four Quarters modules to create a mixer with 8, 12, 16, or more channels and multiple sub-mix outputs
• Connects via headers to WAV Recorder module for recording final mix without using patch cables
• Signal lights for each channel and output mix
• Clipping lights with adjustable level

Electrical and Mechanical Specifications

• Module size:
• • 10 HP Eurorack format module
  • 0.98" (25mm) maximum depth with power cable
• 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
  • Channel bleed-through (Main Level attenuation):
  • • Test conditions: Test signal input into each channel with Level knob at 100%. Frequencies from 20Hz to 20kHz tested. Result given as a ratio of the signal measured on main output jacks with Main Level knob at 0%, to the signal measured with Main Level knob at 100%. Worst-case results for any channel and frequency reported.
    • Left output jack: -102dB
    • Right output jack: -90dB
  • Channel bleed-through (channel attenuation):
  • • Test conditions: Test signal input into each channel with Level knob at 0% and Main Level knob at 100%. Frequencies from 20Hz to 20kHz tested. Result given as a ratio of the signal measured on main output jacks with channel Level knob at 0%, to the signal measured with channel Level knob at 100%. Worst-case results for any channel and frequency reported.
    • Left output jack: channel 4: -90dB at 20kHz; all other channels -110dB
    • Right output jack: channel 4: -84dB at 20kHz; all other channels -110dB
  • Channel cross-talk:
  • • Test conditions: Test signal input into each channel. Level knob at 0%, and other channel Level knobs at 100%. Main Level knob at 100%. Frequencies from 20Hz to 20kHz tested. Measured signal subtracted from signal with all Level knobs at 0%, and result given in dB as a ratio to output signal with test channels’ Level knob at 100%. Worst-case results for any channel and frequency reported.
    • Left output jack: -110dB
    • Right output jack: -102dB
• Headphones jack
• • Frequency response: -0.2dB at 20Hz; 0dB at 100Hz to 20kHz (driving 32Ω headphones)
  • Maximum voltage (peak-to-peak): 5Vpp

Included with the Listen Four:

• 10-to-16 pin power cable
• 4 M3 Knurlie screws