noise in one speaker?

[The Camry]

Ive been running my max volume at around 57/60 on the 80prs. Which means my gains on my amps have been pretty minimal.

Today I decided to drop that number to 50/60 which means upping my gains considerably. Atleast on my mid/sub amps. But now I seem to have a noise issue (whine, only when car is started but not on) coming from my right door speaker.

Heres the strange part. If I mute the door speakers on the HU. I still get the noise, however if hit the switch on my amp from full range to Lpf. Boom, noise is gone. Regardless of what my HUs xo is.

...what

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[murph 10+ year member]

Headunit either needs regrounding or the amp is in ground loop and needs to be regrounded.