Chris15--My sub amp is always on. I kill the bass by using my subwoofer gain on my head unit. I know I have a ground loop because I hear that turbo-sounding whine when I accelerate and have the stereo at a low volume. I remember way back in the day that a local radio shop fixed the ground loop I had in my 72 Dart by running a wire (I have no idea what it was from) into one of my RCA wires. For $15, I think I'll try one of those ground loop isolators. If that doesn't work, I'm too busy with my kids (I'm a single dad) and college to mess with anything more complex, so I'll just take it to the pros and have them figure it out. Then I'll have to put off getting my baby moons
Of course I have the High Pass filter running on the 200!
The worst part about all this is if this had happened 10 years ago, I'd have all this fixed with no problem. I figured the 2 years of electronics I took in high school would help me with all this...
Once again, thank you all for your help. I really appreciate it.