Expedition313

Hello everyone I need some help trying to solve a noise on my door speakers.
I have a 2003 Expedition with a the following set up.

JVC KW-AV61BT the HU is powered thru the factory radio 12v and ground.
Audio Control Epicenter powered thru factory radio 12v and ground.
Power Acoustic Parametric EQ. Powered thru factory radio 12v and ground.
Amplifier's Power. Ran 0 gauge wire from battery fused ran to back of expedition. Connected to distribution block. to feed amps with 4 guage wire fused at les than 2ft. Runs.
Amplifiers Ground from seat bolt. Scraped to bare metal.

HU front RCA output is connected to EQ RCA input.
EQ SUB output RCA connected to Epicenter RCA input.
Epicenter RCA output connecected to Hifonics amp RCA input. (powers a single Kicker Solo-Baric S15L7 set at 2 ohms).
EQ front and rear RCA output connected to Precision Power i1000.4, 4 channel amp front and rear RCA Input. ( powers 4 pioneer TS D6802R speakers).

The Issue I'm having:
Subwoofer works fine. Speakers work fine and they sound pretty good the only issue that I am having is that when I turn the HU volume down you hear static coming from all 4 door speakers. I pause the song and turn the volume up and the static noise also increases. It does this noise with the engine off or running.

Things ive tried to fix the problem with no luck:
*Disconnected epicenter entirely, power, rca everything no luck.
Disconnected the EQ entirely from HU and amp and connected the door speaker amp RCA inputs directly to the HU RCA outputs noise was still there.
Grounded the Outer part of the RCA to HU no luck.
Disconected RCA inputs and connected my phone directly to the amp and noise was still there.
Tried a JL audio amp from cousin car which was working good. and connected the JL amp with all of my setup (epicenter, EQ) and walla no speaker noise at all. So thinking that it might the amp i went back to the store and had it swapped under warranty. installed the new amp to same set up and the noise returned. went back to the person that sells me the amps and he let me used 2 different amps all new and still had the same issue static on all 4 speakers. The only amp that does not give me static is my cousins JL Audio Amp thats old like from 2000 - 2004.
I don't think that all of the 4 new amps that i tried are bed.
Please help i have run out of options. I have been told by some peope to just use filter. But i don't want to do that, because that wont solve the problem is just like a bandage.

Sorry for the long post but i wanted to show all i have tried to remediate the problem with no luck.

P.S. i have checked all of my grounds and they all read .5 ohms and bellow.
(one meter lead on negative battery post and one on the ground being used for all of the audio system.)

Thank you and if you need more info please let me know. thank you.

thumpper

iTrader: (1)

have you checked all your rca and speaker wire ?

I have seen speaker wire and RCA's cause noise if squashed and damaged
..they will pick up a ground loop off the body and cause noise

Expedition313

To make it easier on me I removed all of the door speakers from the doors and put them all on a piece of wood to avoid making contact to metal and ran speaker wires and rca on top of the seat to avoid them being pinched, with no luck the static was still there...

thumpper

iTrader: (1)

try a different head unit ...

I know that Pioneer head units have a micro fuse that will pop and cause
back ground noise if the chassis is not grounded properly.. not shure about JVC

Expedition313

I changed the head unit to a brand new single din SONY CDXGT270MP HU and with set up, no luck. Ran RCA over seats to amp and still no luck. I'm starting to think that my vehicle is possessed. lol....

Expedition313

just out of curiosity, do you might have an idea of why my set up is free of noise when my cousins JL Audio 4 channel amp is connected????

thumpper

iTrader: (1)

if that's the case .......sounds like the problem is your amp