I have a low end problem. I run a Gallien-Kruger 400RB-III (preamp volume 5, master volume 4) head driving an Avatar 2x10 (150 watts at 8 ohms, plently loud, with a lot a rooom to be louder on the master volume), with the effects send from the GK running into the input of a bridged (with volume on max, never ever clips, not even close) Carvin DCM1000 power amp, running 700 watts at 8 ohms into a Yamaha SW 1x18 PA sub. Yesterday just for giggles, I cut the 2x10 out of the picture, I boosted every bass control (on my bass and amp) and cut all the highs. The carvin was just barely clipping, and the sub was about 2x as loud as it normally is. I would like to have more room to turn the sub up (and my whole rig, I have plenty of play left with the master of the GK and Avatar) with my normal tone. Any ideas? I need to get a crossover, to cut all the bottom out of the 2x10 (it bottoms out on about B, an octave above low B), but will this help make the 18 any louder? I guess I need more signal going to the power amp, but since GK put the dumb ass 'distortion past 5 on the preamp volume' feature on this amp, I don't have any room there. My volume on my power amp is max. What do I do? Trip, do you have any idea?