OK, I'm going to try and explain the situation at hand. It is a bit complex, so if I didn't do a good job explaining anything, please tell me and I will try and clarify things.
System before having subwoofers stolen:
4 channel clarion amp (powering 6 speakers) (4 at 2ohms) (2 others at 4 ohms) (it is rated/safe for this)
2 channel alphasonik amp (powering 2 10" subs)
1 Alpine CDA-9825 headunit.
3 20' streewires rca cables
1 20' 4 gauge power cable with a distro block
How everything was put together:
OK, I had the rca cables and the remote on cables, as well as the front speaker cables, running along the right side of my car. They were connected to my amps respectively. On the left side of my car I was running my 12V 4 gauge power cable. It was connected to a distro block and I was using 2 10 gauge power cables to connect both of the amps. The amps were then grounded to the chassis of my car with a bolt. The grounding cables for both amps were 10 gauge. They were both about 3.5 feet long. I know that this setup is not ideal, but everything sounded perfect. There was no engine noise, no headlight dimming, everything worked exactly as it should have.
OK, then came the break in. About a week ago some ****ups broke into my car and stole my subwoofers, and the amp that was powering them. Luckily I had the clarion 4 channel amp bolted to my back seat, and they couldn't get it off. They tried. I know that they tried because there is a big chunk of metal missing from it. About the size of a 1/4 of my pinky finger. IN the process of my subs/1amp getting stolen. The rca cables for my 4 channel amp got damaged. THe ground I was using also got damaged.
Ok, now what I did to fix the problem. First and foremost, filed a police report. I live in a ****** part of town and I want the finger prints to eventually get back to someone. Not because they will be convicted of a crime, so I can go back and beat the **** out of the ****er who stole my stuff.
Anyways, I bought a new amp (logic sound labs 2 channel) to power my two new subs, mtx thunder 6000 brand new just lying around in the back of a car audio store. I also had to make a new ground, so I am using the seat belt buckle after scraping of the paint. Then, I hoooked everything up. I'm still using 10 gauge wires for both power and ground.
Now, I have a HUGE ground loop. I've done TONS of testing trying to isolate the problem, but its no use.
When my car's engine is not turned on, I get a massive loud crack/boom/pop sound when I turn my car on accessory mode, from all of my speakers, including my subs. This did not happen before. Then, my speakers keep on crackling/popping whenever the music is playing. Also, when i turn either my car off or the head unit off, I get another loud crack/boom/pop sound from ALL of my speakers, including my subs. IN addition to this, whenever I put a cd in or change a cd track, I can hear it through my speakers. Its is hard to describe. It is like a wierd crackling/hissing noise. It sounds like really fuzzy feedback on an electric guitar amplifier.
Now, if I turn my car engine on, things really get bad. I've heard engine noise before, but not like this. Its gotta be nearly 80 decibels. I can hardly talk in my car. And the alternator whine is out of control. If I give the car gas, the engine whine is even louder, not just higher pitched.
Here is what I've figured out:
1. I know it is not the rca cables themselves. I bought high quality rca cables.
2. I brought in a home audio reciever to my car and plugged in the rca cables to the back of it, then i listened to the singal with headphones. When i plug in the rca cables to the headunit, even when it is off, i hear alot wierd ground loop hummings, even when the key is not in the iginition. When the rca cable is not in the head unit, even when the car is off, I do not get as much of a ground loop hum. When I turn the head unit on/car on/off I do not hear all the wierd noises I did before. Just a loud hum and quiet music.
3. I've tried about 3 different grounds in the back of my car (my amps are mounted to my back seats), none of them has stopped this problem.
4. My speaker cables, power cables, and ground cables do over lap at one place, but they did this before all this crap happened, could this be a source of my problem?
5. If i remove the rca cables from the amps, all of this crappy noise stops. I only hear peaceful slience.
6. I've tried both of the amps seperately, they still have this problem.
7. I tried running rca cables directly from my head unit to the amps ,through the middle of my car, this did no good.
Does anyone know what I should do to solve this problem. Does anyone know what the problem is? Furthermore, could a ground loop isolator solve this problem? If so, would it hurt the sound quality of my stereo system? Using electrical theory, it should not, but i don't feel like spending 60 bucks just to find out that I have a new problem, bad clean sound.
THank you in advance to anyone who helps out/reads this. I know it is alot to take in. Thanks!