I have a Peavey Mark111 Combo and i've always thought that the speaker was crap because I could only turn it to like 6 without clipping. But I was talking to an amp technition who told me that it was due to the bias being set incorrectly. I thought I new enough about amps to sove most of my problems but i've never new about Bias. Could anyone give me some insight on ths problem, and also where I could get thi done at?. He told me he could do it but he wasn't cheap. 25$ to look at it and 45$ per hour of work. Any info would be appreaciated.