Thanks all, for your help in this matter. We are currently putting together a dedicated theater system, and are leaning towards a Martin Logan set-up. We would certainly like to go with the Ascents for front left and right, the Theater center channel, and the descent subwoofer, but as regards to the rears, for purely aesthetics reasons, we are wondering if we can use different speakers. We would use the Martin Logan Aeons if we had to, but we are hoping to have a center rear speaker, and the thought of three of these sitting across a back wall in our basement is a little daunting. Our question is this - what is your opinion on using a speaker such as the on-wall B&W Nautilus SCM1 speakers, or even the Signature 7NT in-walls? We are thinking of using an Anthem AVM20/MAV50/MAV20 combination, but would be very appreciative of any suggestions! (We are also considering the Sunfire Cinema Grand III/5-channel Signature amp as well - my wife prefers this esthetically (!)). Thanks in advance.