well, to add more confusion to my mess...after all the ways i hooked them up, running the eclipse through the aux of the empeg worked...its not exactly what i wanted to do but it works...kinda makes the expensive eclipse deck pointless.

But if it runs through the aux of the empeg and it was a ground loop i would still have the noise correct?

ive had alternator noise and al those other spark plug type noises befor...this doesnt seem like a grounding problem. the noise im getting is too loud and is coming out even when the car isnt on.