Hi bramley apple, I think in this situation you first have to work out which parts of your system work properly, maybe try your bass , cab and amp with a freinds equipment or something, if you manage to work out (or you already know)that the speaker is causing the fuzz then you could try to get a refund on it. Id also check all the jack sockets are firmly screwed in and all that boring stuff. I suppose it could aslo be possible that the "fuzz" is caused by something in the room vibrating sympathetically although i doubt it. Hope thats some help.