I was at G.C. this afternoon and wanted to check out the B2RE and various other manufactures' offerings. I plugged into a new B2RE wired into a new SVT-610HLF. I enjoyed the tone very much. Setting right next to it was a used SVT350 head parked on top of a used Genz Benz 6x10 cab (don't know exact model #). WOW!! For some odd reason this combination sounded rich, full & warm. I have been reading about how the B2R and the SVT350 are the exact same amp, just in different enclosures. Same goes for the B2RE and the SVT450H, I understand. Any clue as to why the used gear sounds better than then the new?