I have a pro-4 , I tried running biamped. It really was weak. The lead player was using a marshall 50 comb., & kept telling me to turn up. We were both shocked when I told him that I was maxed out. I had just bought this thing used. Its a usa model, about an "04". I was using it with a hartke 2-15xl, & a 2-10 xl. I was using a hartke 7000 to power the cabs, thats only about 350 watts per side. I'd say the pro 4 might be 200watts per side at best. I also have a GK goldline 8-10, that I may try next. I will try it mono-bridged. If the dam>> thing is weak again. Ill be puttin it on E-bay, and go back to the hartke7000.

