4MS Listen Four Quarters

4MS Listen Four Quarters

Four channel stereo mixer with 1/4” (6.35mm) TRS balanced outputs and 1/8” (3.5mm) headphones output

Listen Four Quarters features:

•  Four input channels (two with stereo inputs, two with mono inputs and a Pan knob)
• Headphone and main 1/4” outputs, each with separate Level knob
• Balanced TRS outputs, switchable to stereo
• Line level output driver with zero impedance, capable of driving long cables
• 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

Electrical and Mechanical Specifications

Power consumption

• Maximum values without using headphones jack: Main outputs shorted to ground, headphones jack not used, maximum signal levels on all channels • +12V: 107mA • -12V: 101mA
• Maximum values in worst-case conditions: All outputs including headphone jack shorted to ground, maximum signal levels on all channels • +12V: 290mA • -12V: 101mA

Main outputs

• Output type: balanced zero-impedance, compensated for electrolytic capacitor distortion
• Frequency Response: +/-0.2dB max deviation, 10Hz - 20kHz
• Maximum output level: 17.1V peak-to-peak (+17.8dBu)
• Maximum gain of channels 1 and 2: -4.4dB (hard-panned), -9.1dB (center-panned)
• Maximum gain of channels 3 and 4, and INS header: -7.5dB
• 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. • Output jack tip: <-110dB
• 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. • Output jack tip: -106dB
• 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. • Output jack tip: <-110dB

Headphones jack

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