pre-out noise

I'm assuming you've tried switching the outputs, as well as just running each pair on its own?  For example, give the 4-channel amp's front RCA inputs the signal coming from the rear RCA outputs of the head unit, and give the amp's rear RCA inputs the signal from the front RCA outputs of the head unit.  Try both of these on their own and then together.  See if the noise switches over to the other pair of speakers when you swap to different cables--if so, the problem is with your amp.  If not, then the problem is most likely with your head unit or with one set of the RCA cables (could be pinched somewhere or might have strands exposed touching metal somewhere in the vehicle).

By trying each pair of RCAs with each set of outputs, you are also essentially testing the integrity of those cables themselves.  Try all the different possible combinations and note any patterns.

Ideal way to troubleshoot this is really to just grab a brand new RCA cable and run it temporarily across the seats or outside the vehicle, from the deck to the amp.  If the noise is still there you probably have a problem with one of the components.

yea it sounds like you've pretty much eliminated the wiring as the cause of the problem...David Navone makes some really good noise filters, you might want to check out some of these, in particular the ones that say alternator noise filters.

It is possible that the ground inside the deck is messed up but I think this is very unlikely.  Even if that were the case, you'd pay more getting it fixed than you would on a good noise filter.  Just something to think about...

bdeklejr wrote:

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but when i connect my rca's to the front set, the noise isnt there, but when it is connected to the rear set, the noise is present.  im adding a 4ch amplifier to my car

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50-249 posts=standard member

250-999=silver member

1000+=gold member

As I understand it, standard members can edit their own posts and upload images, but not delete their own posts.  Silver members can upload files in addition to images, and delete their own posts.  Bberman1 is the only gold member right now so I have no idea what (if anything) additional you can do at that level.

I haven’t seen any difference since I became a gold member! But I think some of the more active members should be able to have full privileges since they are valuable assets to the forum.

Certainly you MUST have noticed the extra star under your name.

anyways, I can usually delete my posts, if I try to do so soon after posting.  I haven't noticed any particular time frame that you have before it doesn't let you delete them, cuz I always am only deleting topics immediately after I post them. i.e. when I post the same thing someone else just said but beat me to it. 

On certain topics, however, I can not delete my posts even if I try immediately after posting.  I don't know if this depends on what level member started the topic, or how many total posts have been in the topic, or how long the topic has lasted, or what.

Agree with you about the full privileges for most members.  But I can understand the potential for abuse if casual browsers and web surfers who've only posted once or twice, are given the ability to upload files and images.

Let me just say that I've tried a couple other mobile electronics forums online and none of them can even compare to the12volt.com.  Not only do we have so many active members contributing to the forums on a regular basis, but the whole interface for creating/editing/posting messages is BY FAR the easiest one to use.  The way I see it, 12volt has somehow not only kept this site free for all of us to use, but kept it up to date and included some really cool features along the way.  The knowledge that I myself have learned from it, I could not put a price tag on.  And so he is more than welcome to do whatever he wants as far as restricting members' privileges, myself included.

i suggest buying a ground loop isolator..  it worked fro me  you can get one at radio shack...