sudomod

I didnt notice this at first because its such a high pitch, but my 2nd GBZ is making an incredibly high pitched whine for some odd reason.

Circuit:
If i dont ground A- then i dont head the whine, but the audio is also suuuper quiet if i do that. I'm at a loss what could be causing it since i wired the amp up the same way i did my previous build and that one works fine (PWM instead of HDMI input though)

nvm figured it out. My grounds were going to my collective ground rather than being contained in the audio circuit.