I'm stumped. I play a Stingray 4 through a Mesa 400+, Mesa 4x10 and 2x15, and I reach a certain volume to where the clean turns to fart. My guitarist plays a Mesa Dual Rec...loudly. I'm looking for that all-important 'suck' button that's engaged... Is there a particular eq band that needs to be tweaked? Is there a particular compression setting that needs to be maintained? My band plays many shows where the bass rig has to fill the room by itself, and we play a combination of dub/hardcore/hip-hop/rock. My tone (when playing at reasonable levels) is round, punchy, clear as a bell, with a huge ass. It just doesn't translate well when I have to turn up to impact the space.