Earthquake minime p8

[Brandon Gddings]

I have a earthquake minime p8. I have a humming in the woofer when the gain is turned above 1/2 gain on sub. Does anyone know how to fix this problem?

 

[lovinthehd]

Is it ground loop hum? This might help http://www.audioholics.com/home-theater-connection/ground-loops-eliminating-system-hum-and-buzz