Issue again, ground loop noise back

[Poppinjay]

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.

 

[Poppinjay]

Anyone have any suggestions as need to look at parts today if needed 🙂

 

[synonymous]

You get noise when the RCA are removed?

Guessing that you have at least 3 RCA connections
Try removing them all on the amps and connecting them individually, each alone, then in combinations.

 

[Poppinjay]

Cheers, will try that shortly

 

[jan.didden]

Running anything with the input left open will almost guarantee noise and/or hum.
Why do you run the stuff with the input open??
And how do you know it is ground loop noise?

Jan

 

[synonymous]

Running anything with the input left open will almost guarantee noise and/or hum.

Typo?

 

[Poppinjay]

Im just running tests in the car due to a little interference from the electric windows when I adjust them i get static noise, so just ruling out and possible issues