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I could be wrong but, if this is a 2 channel LOC, then you'd be feeding in 2 audio differential sources. This would make sense if you're getting music from both the Left and Right channels (front or rear, though I'd suggest the front for better quality). To answer your question, the R and L gain apply different levels of gain to their channel respectfully. It's not normal that the audio levels of the Left channel to be wildly different from the Right but, if they are, these knobs would allow you to balance this. Hope this helps.
Sorry, there was a problem. Please try again later.As far as I know, you hook up the Left and Right speaker differential pair of wires to the respective wires to the LOC input wires as depicted by the color code on the LOC. Then you can adjust the R and L gain potentiometers (knobs) with a small flat head screwdriver to balance out the gain between the Left and Right audio channels.
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