Recently purchased a PM7200, and was wondering about how to connect to speakers. There are 4 sets of speaker terminals on the back of the amp (A, B, A+B), and I was going to biwire to my front speakers. I thought the easiest way of doing this would be to connect to all four sets and always run the amp on A+B. Is there any disadvantage in sound quality im doing this? Also, does the Class A mode work across both sets?