Hey guys so for the past couple weeks I've been experiencing an issue with my rear deck where the 6 x 9 subs are. Whenever I am driving and my rpm go between 1500-2500 I hear a constant static noice until I get out of this range. The problem started happening once in a while before however now it has become more frequent.

About my setup: i have a 2004 g35 coupe with about 204km everything in the car is stock except the deck which I swapped for a jvc double din ( couple years ago )and the rear deck subs are hooked onto a separate amp but it is not tuned to high. I also changed the exhaust about 2 years ago but I don't think that would be impacting it (I could be wrong).

I tried looking online however was not able to find a solution that works. I tried changing the position of the ground cable which alot people mentioned but that did not work.

Any advice will be helpful I'm really getting tired of this noise.