hmm. I have all components to common ground EXCEPT the head unit, but I'm only getting feedback thru 1 of the amps.

So to remedy:
1- removed the tiny sub amp as it wasn't NEARLY strong enough
2- hooked the subs to the white infinity amp and put the sub pre-amp's to it.
3- wired cabin speakers and tower speakers to the OLD Kenwood amp

Works awesome! Just need to upgrade cabin speakers now...and it is in the works