Thought I would revive this just to throw out some facts if anyone is searching. I saw Helmet on the Meantime (early one) and Betty tours. Henry Bogdan played a black/rosewood neck G&L L-2000 through a Mesa Boogie 400+ with SansAmp RBI and 2x15 Mesa Boogie cab. He was using the RoadReady version of the cab when I saw them but
is using the standard version in this promotional video from about 92. I've played through that same rig for about 25 years with a number of different Fender basses and it sounds amazing. I've also had both versions of the cabinet and the RR version is punchier and tighter.