Jase, it's basically being able to use complementary outputs , the MJ21195, MJ21196 pairs as opposed to running all MJ 21196's and using a phase inverter in the driver. It's more symmetrical on output, better voltage balance , better distortion and bigger soundstage........not much.....
The big black wires on the BR are #12 silver/teflon (thanks Navo) this is a first for that position....