see its different for all amps..your gonna have to check out your manual for that cause i dont want to mislead you and then you end up burning your shit out. but on most amps it says it where you connect the speakers. i know for the punch amp i had....i had to connect both the negatives of the speakers to the right side negative output and the possitive of both speakers to the left side possitive. but thats a rockford punch..check your amp out first.....another thing that might be messing up is if you used a cheap wiring kit. what kind do you have now? might be the audio input wires... check it all out
good luck
peace