Hi. I have a pair of Monitor Audio GS20s which I plan to use as front speakers in a cinema system. They're currently running off a Quad 909 which I intend to use as part of the cinema system and have the centre and rears powered by the reciever. My question is, could I get away with RS centre and rear speakers? I'm looking to buy second hand so the usual demo route isn't really going to work. Thoughts?