It is really odd.. they sound fine, but occasionally they get a buzz, of varying volume..

bbbbbbbbbbbBBBBBBBBBBBBZZZZZZZZZZZZZZZZZZzzzzzzz

lasts about i dunno 15-20 second.. i think it may be a loose ground in teh sub, anyone else had that problem>? this is pc speakers btw