The most common problem would be the headphone cable, particularly at the plug end. If they work fine on other systems, the next place to check is for a dirty headphone jack. Next a dirty/defective headphout out pot or cold solder joints where the pot or jack connects to the circuit board.
SOURCE: HOW TO WIRE GEMINI GRAPHIC EQ 3000 TO behringer djx750 proffessional MIXER
Line level output of the mixer would go into the line level inputs of the EQ, and the EQ line level outpputs to the line level inputs of the amplifier. If you are faced with a mix of unbalanced inputs or outputs, to balanced inputs or outputs it gets a little complicated because you need to matrix the balanced signal to unbalanced load and vice versa. There is no single answer to doing this either.
RCA jacks are unbalanced, 2 conductor 1/4 inch connections are unbalanced most of the time. XLR and 3 conductor 1/4 inch jacks and plugs can be either balanced or unbalanced.If either are wired so left and right are a single ring or tip on the 3 conductor 1/4 inch jack, it is unbalanced and they would share a common ground lead. XLR wired with one pin common with shield and right and left have a single conductor on the plug or jack, that is unbalanced.
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