Older Kenwood (KAC-5020) - Ground loop??

[tonyi]

I have this older amp that has been giving me problems. It appears to be a ground loop but I have multiple amps grounded together and this is the only amp making any noise. It is a humming (ground loop noise), but my amp also sounds like it's playing half power when this happens. It also is intermintent. I can sometimes unplug the patch cords from the crossover, then plug them back in and it goes away for a while (plus it plays full power again). Then later while driving, it all of a sudden goes bad again (humming and 1/2 power). I have a amp rack with my patch seperate from my power/ground, so I was very careful here. This amp also has a old din/rca adaptor (may be the culprit). I have a feeling it's the amp (being old & all). Any thoughts???

Thanks,
Tony


------------------