Originally Posted by mfarmakas17
That sounds like alternator whine to me. If memory serves me right, itís possibly due to a bad ground.
but this is completely independent from RPM, it makes the same noises no matter what the engine speed. I always thought alternator whine changed frequency based on RPM? LMK if I'm wrong. I've also changed grounds from the harness to the location directly behind head unit with no change. Also grounded the under seat amp to same ground as HU (on a different occasion) with no change. Thanks for the reply.