ebauer

Yeah, I still get that noise. It could be amp feedback but it seems like it stops as soon as the fuel pump shuts down.

OMG I did it. The noise is completely gone! All it took were those ground loop isolators from PAC. I spent $35 total on the 2 and I have no noise or loss in sound quality whatsoever. To be honest with you I didn't have faith in them since I used some cheap ass ones before and they did nothing. At first I just hooked the RCAs up and did not use the 2 ground wires on there (the instructions said don't connect the grounds unless you do not get sound out of the speakers.) The highs hit fine but the lows sounded like hell. I connected the ground wires and it sounds perfect. If anyone else is having

The only speakers I have plugged in are the two rear speakers. I am not concerned about the front speakers at this time. I ran brand new 12 ga wire directly from the amp to the rear speakers. I am not using any factory speaker wires. Yes, I agree the 4 foot gorund was exteme but the only reason I chose to do that is to ground the amps where the battery grounds in the trunk. I talked to my buddy about this issue to and he thinks that since the battery is in the trunk I might be getting noise where the RCAs connect into the amp. By no means is he a certified installer but I may try mounting the

Alright I have been working on this damn thing on and off all day. I made a new ground with a self tapping screw and the ground is now only 3 inches long. Still, the whine has not changed at all not even a little bit better. Man, this is frustrating. Ok, did we narrow it down to the D3 yet?

Well, I really don't think the amp is where I am getting the problem from now. I just plugged my Ipod into the amp (totally bypassing the HU) and I could not get any whine at all unless I had the gain set almost all the way up on the amp. The SQ wasn't as good as the HU but at least I didn't have any loud whine. Hell, I should just return the D3 and just plug the Ipod into the amp. I am going to be relying heavily on these ground loop isolators when they arrive. Anybody have any good experience with isolators?

Ok don't laugh - the ground cable I was using was about 4 feet long. I shortened it to about 15" and grounded at a seat belt bolt. I sanded the area good before I made the connection. Unfortunately, the whine has not changed at all. I wish I could say it is a little better but no. By the way, I didn't even have my sub amp hooked up when I just tested it. Well, now what?

Good deal, I am going to shorten those grounds right now and ground away from the battery and see what happens. I'll let you know what happens. Thanks Again!

Hey Tillitz you help is much appreciated. Yes, I double checked the amplifier and it is 2 ohm stable for 4 channels. Here is the amp specs from Crutchfield. http://www.crutchfield.com/S-nxEKHnENQB ... thunder564. To summarize my problem here is the situation I have going on... Equipment: Pioneer AVIC-D3 Infinity Kappas (2 ohms) MTX Thunder 564 4 channel amp Kicker KX600.1 amp 1 10" Kicker L7 sub 3 sets of Stinger Expert Series Interconnects Vehicle: 2005 Chevy Cobalt SS Supercharged Coupe Pioneer Factory System Option Stock Alternator Optima Yellow Top Battery Th

Haha, sorry didn't mean to confuse anyone. Yes, I have an aftermarket amp! It is a 4 channel MTX amp, I didn't mean to confuse anyone by saying it is not refurbished - I was just saying. The amp is 2 ohm stable and that is what the speakers are. I am using Inifnity Kappas all the way around. Yes, the speaker wires run directly from the amp to the speakers. I will make a new post when I get home later and clean up all the babble for you guys.

Ok, I am done for the night screwing around with this thing but here is what I found... I was looking at troubleshooting steps on how to get rid of the noise and here is what I did... I unplugged the RCAs from the amp and started the car - there is no noise in the speakers at all. I have an extra pair of RCAs and I connected both of the reds into the rear side of the amp (same side of the RCAs). Immediatley, the noise started again and the RCAs were in my hand to avoid any interference from any power wire, ect. I noticed when I moved the RCAs in my hand the noise varied in pitch. So do

I used a cheap ground loop isolator before with a different Pioneer setup and it did not make a difference at all, it was a Scosche though. I see PAC makes one that I will be purchasing by the end of tonight. Etong- you mean you just hooked up your speakers directly to the HU? So you no longer use the RCAs or an external amp? I know that will eliminate all the whine if I go that route but my problem is I have all 2 ohm speakers and I can't directly run them from the D3 because it will burn it out. Or...are you saying you are not using RCAs and hooking the HU up to your amp via the speaker

This is so ridiculous. This is the third Pioneer Unit I have had with the same whine problem. Also, this is the second amp as well. I have grounded, regrounded the HU and the amp. I have tried grounding the RCAs with no effect at all. I have Stinger Expert Series RCA cables, D3, MTX Thunder Amp. I guess I am going to try that ground loop isolator that PAC makes. The whine only happens with the engine running. In accessory mode everything is fine. What the hell...I am so frustrated.