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Chuck Levin's will be closed Thursday November 28th
Chuck Levin's will be closed Thursday November 28th

4ms Listen IO Modular Signal Converter

by 4ms
Sold out
Original price $125.00 - Original price $125.00
Original price
$125.00
Default Title: $125.00
Current price $125.00
❓ Out of stock

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New: The item is brand new as received from the manufacturer with a full manufacturer warranty. Instruments such as guitars, snare drums, drum kits, brass and woodwind instruments may be opened for photography and quality control inspection and may not be in a factory sealed box.

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B or C Stock: Factory refurbished. These items were purchased from the manufacturer in a refurbished condition. They will show some cosmetic issues, but nothing that would impact performance. Being that these are sealed from the manufacturer, we generally do not open these to photograph the cosmetic issues. They are guaranteed to work and may have a limited warranty or you may purchase an extended warranty in some cases. Please see the listing description for item specific information.

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Convert Signal To And From Your Modular Setup For Infinite Integration Possibilities With The 4ms Listen IO Modular Signal Converter

The Listen IO is a simple module which gets signals in and out of a Eurorack system by converting to and from normal modular levels. The top section converts any external signal to modular levels by providing up to 30x gain (+30dB), allowing you to use table-top synthesizers, keyboards, phones/tablets, computers, toys, microphones, etc. in your patches. The bottom section does the opposite: modular signals are converted to normal line level signals. The bottom two jacks can be used as line outs or as headphone jacks, so you and a friend can listen in stereo at the same time. 

Each section has two inputs and outputs for use with a stereo signal or two mono signals. An LED bar graph for each output shows the signal level and clipping.



  • Line to modular conversion, and modular to line/headphone conversion
  • Works with guitars, table-top synths, effect pedals, keyboards, groove boxes, and many microphones
  • Dual mono or stereo conversion
  • LEDs show signal level and clipping
  • Gain knob allows for wide range of boost or cut
  • Headers in back for connecting to Listen Up or DIY adaptor module (1/4", banana, etc.)
  • Two headphone outputs and stereo inputs for use as a compact headphones module


  • 6HP Eurorack format module
  • 0.95" (24mm) maximum depth (includes power cable)
  • 10-pin Eurorack power header
  • POWER CONSUMPTION
  • Maximum values - All output jacks shorted to ground, 22Vpp signal on all input jacks, knobs at 100%
  • +12V: 62mA
  • -12V: 55mA

LINE TO MOD SECTION (TOP)

  • Output: 1k impedance
  • Input: 100k impedance
  • Frequency Response: +/-0.1dB max deviation, 20Hz – 20kHz
  • Maximum output level: 22V peak-to-peak
  • Maximum gain: +30dB
  • Channel cross-talk Test conditions: Test signal input into left Line In jack. Sine wave at frequencies from 20Hz to 20kHz tested. Gain adjusted to maximum value without clipping. Result given as a ratio of the appearance of test frequency measured on right Mod Out jack to left Mod Out jack. Test repeated with left and right jacks swapped. Worst-case results for any channel and frequency reported. Note: cross-talk is much higher when clipping occurs.
  • @1kHz: <-110dB
  • @10kHz: -78dB
  • @20kHz: -74dB

MOD TO LINE SECTION (BOTTOM)

  • Output: 68 impedance
  • Input: 100k impedance
  • Frequency Response: +/-0.1dB max deviation, 20Hz – 20kHz
  • Maximum output level: 22V peak-to-peak
  • Maximum gain: 0dB (unity)
  • Channel cross-talk Test conditions: Test signal input into left Mod In jack. Sine wave at frequencies from 20Hz to 20kHz tested. Result given as a ratio of the appearance of test frequency measured on right Line Out jack to left Line Out jack. Test repeated with left and right jacks swapped. Worst-case results for any channel and frequency reported.
  • 20Hz – 20kHz: <-110dB


Manufacturer: 4ms
Model: LIO
SKU: I581246-N-0-WHXX


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