x2. My bro's retarded about it, he stripped his car for his "audio setup" and it's been sitting there for 6 months //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif . God I love that 1600.2 so much, I wish they still sold the VGA series. I would've gone with those amps.
As for the ground loop, i've tried 3 or 4 different grounds in the car already. Even tried grounding it to my battery. Tried it with 2 different amps (my Tru 100.4, and my bro's ED nine.4). I'm pretty sure its something grounding out somewhere cuse there's alt whine sound in my fuel pump. I get a really bad buzzing noise in my speakers (mids/tweets). I've even tried using an ipod 3.5mm to RCAs to the amp and the buzzing noise is still there, so im pretty sure it's a bag ground somewhere. I'm stumpped, spent over 15 (added up) hours rechecking everthing over and over. Been driving around with my car completely stripped (cept driver's seat) to see if i could find what it is //content.invisioncic.com/y282845/emoticons/crying.gif.ec0ebefe590df0251476573bc49e46d8.gif .
Also did big 3 and just put in my HO alt (fuel pump whine and speaker buzzing sounds has been there since my original alt.) I thought about trying a ground-loop isolator but seeing how even RCA's from my ipod had buzzing sounds in the speakers i really doubt it's the RCAs. Also i heard a ground loop isolator is pretty much just a band-aid like Time Alingment. So I rather solve the main problem.
Gonna try some more testing tommrow and work on my panels since i dont got school.