Little Labs MONOTOR, Operator'S Manual

The front of the monotor has four headphone output jacks, two 

3.5mm and two 1/4” .  The two jacks to the left are fed by one stereo  amp and the two jacks to the right are fed by a separate stereo amp. 

For the best performance use one set of phones per stereo amp 

output. But if you need to use all four, you will not damage the  monotor and performance difference for casual use is minimal.

The little holes on either side of the level  potentiometer conceal a push switch set back  about an inch. The left switch pushed in  bypasses the left side of the level potentiometer,  the right, the right side of the level  potentiometer.  These can be used for a variety  of scenarios (see more in the manual). The  most common is when using the monotor with a  high quality digital to analog converter that has a  built in level control (like the Oppo 105). The  highest quality level pot is no level pot.

Stereo / mono function switch selects: stereo reverse (maybe that hi hat  sounds better on the right?), regular stereo, mono left plus right, left only (in  both ears), right only (in both ears), left minus right for hearing what is out of  phase (between what is feeding the left and right in) and also useful for  compressed digital audio file artifact analysis.

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