I wish my 7.8 Integra had A & B, because I would like to use my Integra as a pre-amp for 2.1 set-up, and also have a 5.1 setup using my integra for surround, of different speakers all in the same room. This can be accomplished buy having only one set of fronts connected to A, and nothing to B, so buy going to B, no sound , and when you turn on the power amp only the 2.1 set of speakers can be heard. If that makes sense to you. I think they are doing away with A & B speakers option In the new recievers coming out. Too Bad!