Didn't searchbar. Need some quick answers.

My bassists amp is broken. We have no idea why. We originally thought the speakers were blown since the amp would pop and fizzle when he would play until the volume just died out and then, eventually, died out forever.

Now? Threw in new speakers, problem persists. Once it gets to a certain volume threshold, commence popping and, for lack of a better term, farting and buzzing like no one's business. We have no idea what it possibly could be. Any ideas as to what it could be and/or suggestions on how to fix it?

Thanks, guys.

EDIT: It's GK Backline 210, a solid state amp.
Last edited by Wrst_Plyr_Evr at Aug 6, 2011,
Tube or solid state?
Quote by strat0blaster
This is terrible advice. Even worse than the useless dry, sarcastic comment I made.

Quote by Cathbard
I'm too old for the Jim Morrison look now. When I was gigging I had a fine arse.
Maybe he broke a fuse?
Guitars: Fender FSR Standard Strat, Squire Affinity Strat, Epiphone Nighthawk
Amps: Vox AC15C1, Roland Cube 15x, Peavey KB-1
Pedals: Digitech RP355, HD500, Joyo AC-Tone, EHX Soul Food