I'd bite the bullet an buy at least one MCS1 for your center. You won't be sorry. I run 3.6ers in the front with MCS1's center and rears. I currently have a nice pair of SCS3 at auction. They use to be in the rear and can be had for cheep, if you don't mind a couple scratches. It has been my personal experience that Thiel works best with Thiel