I just installed my system which is one 12 JBL with kenwood amp and a power capacitor.
Im getting a really weird noise from either the speakers or i think it might be the sub, its like a whining noise n it seems to work with the acceleration the more i accelerate the louder it gets
Does anyone know what that might be?

You have a bad ground.
You need to make sure all your componets are grounded and grounded securly.
Simple fix.

Also, make sure the RCA cables from the recievers amp output is runned away from the amps positive power cable. So in other words, power cable on left side of cabin, rca cable and remote wire on the right side of the cabin. You can get ground using the bolt-down areas for your rear seat belts.

i had the same problem you did.. i have an external dvd player connected to my headunit. the higher i'd rev the louder the whining sound would get.

so i bought on of these:



Ground Loop Isolator


...and totally eliminated the noise i was getting. but you'll probably need an RCA extension cable for your setup.

^ So did you run that from the back of your deck straight to your amp?

A lot of people will tell you a ground loop isolator is a diagnostic tool, a bandaid on a problem if you will, but I have one installed on my system permanently cause I have sort of a complex setup, if I could though, I would just use the GLI to find the problem and fix it right.

Edit: spelling

This post has been edited by Cutrara: Feb 4, 2008 - 11:44 PM

>

That makes no diffrence for the setup he is using, that only makes a diffrence in systems using high freq audio...laymen terms, if he is using powered tweets, he doesn't want his power ran next to the source and power. His issue is ground to one of a few things. Altenator, Head Unit, or Amp. More then likely its the amp has a bad ground. Seatbelt bracket works, but I would suggest drilling a hole, or using a self tapping screw and create one within the trunk itself for it.....just make sure your drill spot is clear!

If you redo your amp ground and it continues to do so, move on to the next thing being headunit seperate its ground from the harness connection and create you own ground via the frame. Then if once agian continues, just a get a group loop isolator.

Batman hit it right on the nose, on the first reply. No need to make the man re run his power and RCA's for nothing. Cause it won't fix anything doing so.

I had the same problem on my old Pioneer deck and a little bit of it on my last Alpine deck. If your grounds end up being okay, you may have a difference in potential between your deck, rcas, and amp. I had to wrap a separate ground wire around each of the rcas and ground it to the outside of the deck. This fixed the issue on my pioneer and made it much better on my alpine.
Not to say that this is the issue, but it has been on 2 out of 3 of the decks ive owned and a couple of the ones i installed while installing for best buy.

Ground loop isolators really are just a band-aid. If you can fix the ground issue, its better.

This post has been edited by zonz540: Jan 25, 2010 - 3:54 PM