not a new problem. player has about 3 hours total use so far.
a battery operated mp3 player was hooked to the amp before. problem did not exist then. but that's little help.
can't get to the back of the sled very easy, but a glance some time ago seemed to check out.

the power and ground are overkill, large leads direct to battery (both power leads together, always on).

with the engine on, and the empeg on pause, the noise gets louder with each RCA jack I remove from the amp, loudest with just one plugged in, then nothing with them all out. tested a few amps at this point. all the same.

ug