When I start SD there is a really hard rumble in my sub. If I close SD it stops, if I do something in SD to make it "think" it stops. (such as going to Navigation).
I can have SD open and go to another program (SD minimized) it stops. I can play in just media play and no rumble sound. It only does it when SD is maximized. It even does it when no music is playing.
I tried disconnecting the USB connection and it did not stop.... so it has to be some video thing.
I purchased a DAC that should get here today. I am going to try and see if that works. Will let you know.
DAC Got rid of the noise.