Issue again, ground loop noise back

Hi,

Sorry to ask for advice again. Prob easier starting new thread.

So I have a Pioneer headunit, Hertz Millie Pro fronts bridged off a Hertz HCP4, twin JL Audio subs running off a JL Audio 1000.1 amp. Amps share the same ground through distribution block

I have spent two weekends trouble shooting a slight hiss and static in the car.

I think I have figured out whats causing it I just need to know the best fix

I removed my HID headlights thinking this was the issue, but no. My power cables are routed down the left side, Rca's down the middle and speaker wires on the right. Mounted a new ground, mounted both Amps to MDF before fitting to the seats to insure there not direct contact with metal.

So, it would seem If I remove the RCA ( amp end ) on the sub amp i get alot of ground loop noise through the components, plugging them back in its virtually gone.

Whats the best fix for this issue.

Much apreciated

Btw I have tried a ground loop isolator but no effect.
 
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