I used to have a GK backline head and a peavy 4x10 cab. Had to sell cuz the cab didn't fit in my new car. I now own a Ampeg B2-rE head and backline 2x10blx2 & 1x15blx2 cabs. I'm not getting much power at all. It's not the head, cables, bass or cords. I've used a 10x6 cab and i can turn it past 1.5, with my cabs i got to crank it to almost 7 or 8. What could be wrong? I'm usually pretty good about this but I'm baffled.