Quote:
In the end I just had to unplug and replug the RCA jacks ...

In that case, also check for this problem. That would explain both the symptoms you described, as well as the reason that fiddling with the RCA connectors fixed the problem. If that was the cause, then the noise will come back.

Unless you meant that you fiddled with the RCA connectors at the amplifier in the trunk, in which case the problem is not likely at the empeg end.
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Tony Fabris