OP
I got the RCA to 3.5mm cable and played a song with a lot of bass, they worked amazingly, but without that cable with just the rca wire it doesn't playYea you should plug straight into your amp and only the subs should play. If no noise this means your amp or your sub is bad.
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[/color]Or use a DMM to measure the resistance(ohms) of the voice coil(s)