i just bought an amp to power my tweeters i just got. its a cheap little legacy amp. i hooked it up to my tweeters, and i got this horrible, horrible feedback noise like i had a ground loop somewhere. so i added a ground loop isolator, and the sound went away a good bit, but i could still here it when the radio was on but with no volume and when i reved the engine, the sound matched the reving. these are all the signs of a ground loop. but, then i looked at how i had it setup. i was running rcas to it for the input. since these are highs, i should have hooked up the high level inputs from the head unit...right??? is this the cause of my problem? any input is appreciated.