MTX 81000D Noise

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does the amplifier hum without the signal cables connected to the amplifier. If it only hums with the cables connected, I would check into a possible ground loop problem, or check the grounding of the headunit.

I once fixed a friend's system that had a bad case of ignition noise in the subwoofer. different (better shielded) wires did diddly. there was also an input grounding screw on the amp; connecting it to the headunit's chassis also did nothing. Grounding the headunit to the amplifier's ground point instead of the vehcle chassis also did nothing. Later, i ohmed out the head unit's RCAs and found that the ground was not connected. I guess that there was a bad solder connection between the RCA jacks and the circuit board. I grabbed some RCA Y adapters, connected them between the HU's sub wout and the cable going to the amplifier, cut the other end, and then connected the grounds on the Y-cable to a screw on the chassis. that fixed the ignition noise. quite odd.
 
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