I have a big problem , I've gone around the whole trunk looking for a ground to stop the engine noice. The bass has a popping sound none stop its a constant thump thump thump even when the radio volume is at 0. The voice speakers have a rpm whine. the higher it goes the higher the whine. I have the 4 gauge power cable ran through the right side and the rca, remote ran through the left side under the side steps right under the carpet there. I tried getting a capacitor to see if that would help the ground but i dont know what else to do. I'm this close to changing the radio.. can some one please help!!

 

could you please explain a little more about your system?

what kind of amps are you running?

how is the amp hooked up to the speakers?

what kind of wires are you using?

 

Is your head unit grounded well? Also have you tried turning the gain down?

maybe you could benefit from this:

http://www.crutchfieldadvisor.com/S-..._diagnose.html

 

ok well i have a coustic amp 400 watt. to 2 fosgate punch HE2 . they are ran normally. also a drive for voice. the coustic is only 2 channel they arent bridged or nothing. i got "4layer shielded monster" rca's really thick. i have the main 4 gauge power cable to the capacitor. and a ground from under the floor mat in the trunk to the cap and from the cap i ran the ground to the amps
the radio is grounded to a black wire with brown stripes. its skinny like the speaker wires. i honestly think its the HU

 

anyone help?!!

 

at any point does the power wire run next to or cross the RCA's? Try to make sure that the two are seperated at all times. Also, if the power wire has to cross the RCAs, make sure they cross at a 90 degree angle. The EMF from the power wire will not enter the RCA cable if they cross at 90 degree angles.

One other thing, what kind of RCA cable are you using? Cheap black ones with red and black RCAs or good triple shielded ones?

Mish

 

you sure that your RCA's aren't getting pinched somewhere?

what kind of head unit do you have?

there have been a few cases where the RCA's we used were bad or directional.

i'd say take out the RCA's and run them on the outside of the car to ensure no interference. then gain access to the back of your head unit and mess around with the RCA output plugs to see if the noise changes when you play with it. if so, its your deck. :thumbup:

 

i got "4 layer shielded monster" rca's really thick ..and no i checked them continously they are good. they are round green thick rca's.

 

 

Ok. This is going to be a tough one. I admit I didn't really read your first post. I usually read to the point where there is engine noise and automatically go to the RCA type and how they were run. I apologize for not reading your entire post.

The first thing we need to do is isolate the problem. This may require you to make a few trips to Radio Shack to buy some stuff. None of it will be very expensive though :thumbup:

Here's what to do:

First, does the thumping sound occur with the *edit - engine* off?

Isolate the HU from the rest of the system to determine if the problem is in the HU. To do this, you need to use a different source. A discman works well here. If you have a discman or can get one from a friend, use this. In order to get the discman to hook up to your amp, you'll need to buy one of these.

http://www.radioshack.com/product.as...5Fid=42%2D2483

This will hook up the discman to the amps. Make sure that you hook the cable up to the discman LINE OUT not the Headphone jack. If your discman does not have a LINE OUT, the you will need to use the headphone jack. Just don't turn the volume up very far.

If the noise is still there, then the problem does not reside in the HU. It is somewhere else. The next thing to try would be to test the RCA's. Use these

http://www.radioshack.com/product.as...Fid=274%2D1548

To plug your RCA cables to the discman then to the amp. If the problem comes back, the problem is the RCA cables.

If the problem doesn't come back, then you have a problem with one of the amps.

Try to take one of the amps out completely to see if that fixes the problem. If it doesn't, then you may need to replace the amp(s).

Good luck.

Mish