Pioneer HU Problem

[aeyanez]

I was told by a friend that there are plenty of people in this forum that know what they are talking about and are not complete aholes.

I just bought a Pioneer 7600 MP3 CD Player and a Kicker 12" L5 Dual 2 ohm voice coil which I placed in a 3/4 MDF 1.0 cu ft Sealed Enclosure. I connected everything using the stock cables and a 8 gauge amplifier kit which was already in the car from my previous setup. The Subwoofer is being powered by the Rockford Fosgate Punch 500a2. During the first day of use everything was fine and seemed to be running well. The next day I had some electrical problems which I thought was related to everything I had just installed in my car. After fixing the problem I reconnected the system and ended up with engine noise. I reconnected the RCA's to the Rear output of the HU and the engine noise was gone. So, when the RCA's are connected to the Subwoofer or Front I get engine noise. When connected to the rear it is fine but I would prefer to have it to the subwoofer preout. I've read in this forum and in several others that it could be an issue with the ground. My question is, Should I even bother trying to reground everything or should I just take back the HU?

I am also looking to upgrade my current setup with an EQ, another Sub or whatever else. I plan to eventually end up with 3 12" L5 or L7 but I also know that I should make sure I have enough power and take care of all the lose ends. I plan to move more towards SPL. I would appreciate any advice from your expert minds as to what my next step should be.

Thanks for paying attention to my noobie butt and again ANY help is greatly appreciated.

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[DFW40 10+ year member]

So you have 3 outputs sub front rear. The rear is the only output that works without engine noise, so you are hearing the engine noise through your sub? Or is it coming through your other speakers?

 

[forbidden 10+ year member]

Good question. 99% of the time the noise is only present when the vehicle is running and the noise mostly is present in the front and rear speakers. If you have moved the rca cable from output to output and get noise on one and not the other, you have found your problem. In my hands on experience, Pioneer heads have a piss poor internal ground plane design that is a breeding ground for noise.

What exactly did you fix on the car the day before?

What kind of vehicle is it?

Where is the amp grounded to?

 

[aeyanez]

HAVINGFUN:

Yes the noise is only coming from the sub when the car is on. On a side note the Front output and Subwoofer output are on the actual HU, while the Rear output is coming out of the HU but not on the HU. Those with pioneers probably know what i'm talking about.

Forbidden:

On the battery their were two cables that weren't making enough contact with each other. When I installed everything I had swapped out the battery terminals and not installed them correctly. This was causing all sorts of lights to come on including the voltage gauge which was displaying to much voltage...close to 18 volts. I then fixed this and tried to reinstall my stereo but I f'd up when the constant power cable or memory cable (don't know what to call it but the cable that maintans a constant charge) accidentally touched the chassis of the car. This meant I had to run a new cable to the battery. But in my previous experience I found that you need to have a fuse so that the cable won't fry. I connected the power for the Kill Switch and stereo to the same cable I use to power my amplifier. It's ghetto but I had to get my car moving.

I have 1985 Toyota Supra and the amplifier is grounded to a bolt I found in the the back that is directly on the chassis of the car.

 

[forbidden 10+ year member]

There is a very good chance that you have damaged a circuit in the head unit. I would test for this by borrowing a buddies cd player and giving it a try. I would go back to that battery and disconnect some of the wires that were just reconnected to see if the problem goes away.

 

[Slody4Futbol 10+ year member]

did you ever connect or disconnect your rca's while the head unit was on? if so you more than likely blew the ground trace... also you can do it while having the loud function on... and boosting the bass.. and playing a bass test cd... unfortunately... but that's why i bought a warranty on my 8600 :-D