Hi guys.. My set up consists of mission m73i for fronts and m7c1i for center... Im currently using my wharfedale diamond 8.1 as my rear surround. They are driven by harman kardon 2550 which is powerful enough for my small room. My question is it ok for me to use the wharfs as my rears? Or should i get a mission series too? Any thoughts on this. Additional info. for music listening i just listen to 2ch (fronts) if this helps. I only go 5.1 for movies . If I listen to multi channel using 8,1 as rears would it have an adverse effect?