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Listen IO

4ms Company

User Manual 1.0 – Jan 2, 2019 

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.  

The

 Listen IO 

features: 

• 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 

LISTEN IO

Summary of Contents for Listen IO

Page 1: ... 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 The Listen IO features Line to modular conversion and modular to line headphone conversion Works with guitars table top synths effect pedals keyboar...

Page 2: ...mics that require power to be delivered over the cable Phantom powered and electret mics These jacks are mono If you have a stereo signal patch the left channel into the left jack and the right channel into the right jack Gain knob The Gain knob controls how much the Line In signal is boosted Although the signal paths of the left and right channels are separate this knob controls both channels The...

Page 3: ...means the signal level is not changed LED bar graph The LED bar graph displays the level of the attenuated signal The more lights that are on and the brighter they are the louder the signal Unlike the top half of the module the bottom half will never cause clipping and therefore there are no red lights Line Headphones Out jacks The two Line Out jacks output the attenuated signal These are multi pu...

Page 4: ...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 20k...

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