Feedback problem please help!

[kale 10+ year member]

So i've just finished my first install, and it sounds great, except for this feedback

The feedback varies with the engine rpm, if i rev it it will click faster, so i'm wondering how do I fix this. My power wires are on once side of the shifter and rca cable is on the other. My speaker wire runs under each door. Please help, it sounds pretty good but I need to get this fixed.

Thanks!

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[kale 10+ year member]

i have a poineer deh 6900 head unit; i'm thinking it might be the infamous ground problem

 

[wesl56 10+ year member]

i have a poineer deh 6900 head unit; i'm thinking it might be the infamous ground problem

theres a good chance....

99% its a ground prob

 

[kale 10+ year member]

i've ran the head unit's ground to the amp so i know it's the same: didnt fix it

I tried the RCA grounding wire trick : didnt fix

I set levels : didnt fix

I don't know what it is; but the above things did LESSEN it. Hopefully I'll find some way to shield behind the head unit or something. I have stinger 4 rca cables if that helps anyone figure stuff out.

There is no noise when the rca cables arent plugged into the head unit.