I had bad a ground loop until I found that my crossover was the source of most of it. I took it out and SHAZAM. it was gone! So it may not be just the amps or the empeg.

There is a crossover built into the big (400W) amp, which I use.. but to this point I'm only working with the smaller amp powering my front speakers. The rear amp has been completely disconnected during my whole ordeal.

do you get whining when you use a source separate to the car, ie. plug the empeg into the AC mains and power up the amps. still whining? then it's within the amp setup. otherwise it may be the supply rail of the head unit (empeg or not).

This is a test I haven't been able to try yet, as I live in an apartment on the second floor and have no extension cord that long to try this out with. When I head into work Monday I intend to remedy that.

try just connecting the center pin of the audio cables into the amp. this either gets really good or [u]really[/u] bad. If it gets better it is definitely the grounding issue, if worse there may be a problem with the power supply rail to amps or head unit, either alternator noise or still a loop problem

Erum, you mean just the positive leads on the RCA jack? so that the outside is not touching the outside of the jack? Hmm, Ok I'll give this a try tomorrow and let you all know how it goes. 8)

also try moving all amps & head unit to one spot, hooking them all up with power and what does it sound like?

Man that would suck. My cables are under the floormats and there isn't enough room under the front seat for my big amp. I'd have to recut all my cables to move the small amp to the back, and that would mean not only would I have to run the power/ground all the way to the rear, I would have to run the speaker wires all the way from the front (empeg) to the rear (amp) then back up to the front (to connect with the car speaker leads). I donut think that would probably help the situation at all, do you?

do you take ALL your ground cable back to the same point? need that too but preferably with short cables

Yes. I tried every combination possible, from pulling all the grounds to one central location and also by seperating them all apart and trying different places. I assume that when grounding, though, any metal bolt that connects to the chassis of the car would be sufficient. Is this a correct assumption or no?

Are the amps indirect contact with metal?

Actually, one might be. I'll try completely insulating it from the rest of the Jeep tomrrow and post an update.

We'll all band together so that ClemsonJeep can impress his date tonight he said stoicly to no one inparticular

Oh well, too late for that. The date went okay despite the fact that Emmanuel was not able to make it with us. ;)

(O|||||O)

ps: thanks for the suggestions.. lets keep them rollin in people! I'm not putting it back in the dash until I get at least HALF of my feedback whine reduced. :)