I bought a pair of 522s along with an S8 sub for stereo a couple years back, and am thinking now of upgrading my HT from a Yamaha set-up to all Aperions. I'm thinking of going with a 632/533 VAC front stage, but would like to use the old (but still nice) 522s for rear surrounds. Also, since my HT amp is 6.1, I need a rear center. Two questions: 1. ...