Current setup. Amp: Sony Str-dn 1050 Speakers 2.1: Fluance center and bi-pole fronts along with a cheap Polk sub. 1) I'm thinking of getting monoprice.com in-wall speakers for my rear. My Room has a 11 feet ceiling and my sofa is touching the rear wall. How high from the optical seating position should I mount the speakers? How far apart should the speakers be? 2) Currently I have Fluance speakers which are all currently 5" and I'm thinking of getting Monoprice 8" 3 way. Is this a good idea to mix the speaker size? Or should I match the speaker size? http://www.monoprice.com/mobile/Product/Details/6816?mainCategoryId=108&categoryId=10837&subCategoryId=1083703&cpnCd= I will replace the bi-pole with towers when I can find some extra money. And it will most likely be Fluance XL7. They also have 8" down fire subs. Have anyone tried the monoprice in-wall speaker? And feed back please. Thank you,