Hey. I bought a Randall RB100X bass amp(100 watt) a few days ago and after i had played for 10 minutes or so(yeah, i did turn up the volume and slapped a bit, but only for a few minutes, otherwise i play @ volume 5/10, gain 5/10 approximately, I didn't use this amp at a gig yet, I've only got it for a few days), i couldn't get a clean sound out of it anymore(the volume doesn't matter: I get the same sound playing softly as i get when I play loud. Every time I play a note, I hear this buzzing(and it's not the sound you normally get when you don't put your finger on the string in order to stop the vibration-I don't know the exact English word for that-). When I play with another bass(with older strings) I even get a kind of distorted sound. Anyway: what could cause this trouble. Is it possible i blew up a speaker? I also recorded an audio file of the sound I get, check out the attachment.