Weird problem, no biggy but need help

[Silica 10+ year member]

For some reason i have installed all my equiptment deck speakers and 4 channel amp. Now this is the same amp i used in my last setup none of the wires have been moved modified or removed, they were simply plugged back in. Now before the new deck and door speakers i didn't pick up any alternator noise. Now i am, however its only when the amp sensativity is within the 200mv - 3v range, once i push the bottom to switch to 3-8v no noise, however less gain.

Now when its in the 200mv - 3v range, the front rcas going to the amp i unplugged and the noise was gone, so im picking it up somewhere along the line of the rcas. However, the rear and front rcas are ran beside eachother and the rears arn't picking up noise.

So my conclusion to the nonsense, is that matters no biggy, it must be a bad ground on the deck, or a simple moving around of the front rca or maybe new one. Im going to reground my amp gorund as well see if that helps...

But the noise only accures when the gain is maxed out and in 200mv - 3v sensativity. Any input would be greatly appreciated.

Tim

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[helotaxi 5,000+ posts]

You are getting noise from the ground of the new deck. Try moving it around to a better spot. What deck is it BTW. Some decks are more prone to noise than other due to poor signal ground isolation.

 

[Silica 10+ year member]

Its a planet audio P500DVD, its a good deck, brand new but im going to try regrounding it.

But how ocme only the front rca's are picking up noise and the rears arn't?

Tim

 

[Rattlebrain 10+ year member]

Could possibly be a bad RCA cable. You could try unhooking it on both ends and ohming it out . If your not sure what i mean just shout back and I'm sure we can help you out. :thumbsupw