Howdy everyone! I'm probably going to purchase the HK 7200 and while reviewing the specs and stuff I noticed that there is not output for a "rear center" if you were to run a 6.1 setup - which I will be doing. There is only rear's and rear's a and b. Can I run a 6.1 setup or am i confined to 5.1 or purchasing an additional speaker in order to have 7.1? Sorry for the confusion.