sounds like something via ac. Audioprism quietlines are supposed to help with this. $27 each. Can't comment if it will solve it. Try plugging the computer or sub into a different circuit...
Audio Physic Rhea subwoofer.....
This is a great great sub, integrates with my Virgos seamlessly. Once in a while, I get a popping sound out of it, i assume this is due to dirty electricity, it seems to coincide with my computer hard drive engaging, among other things. Will a surge supressor work? Or do I need a separate power line? Will a surge supressor also supress the current that the amp is trying to draw? Thanks.....Mark