Hello, this is my first post as I am a proud owner of some Polk speakers now. My HT room is 11' x 10'. I am replacing my Bose 201s with RT15is as mains. I have a Sony center channel SS-CN100 that sounds very large. I have to turn it down to -9 for it to be level with all others.I own an RT25, speaker would that make a better timbre match or should I look for a Polk center channel speaker? And which model would you recommend?Thank you in advance. I realize that I could just change everything at once but I wanted to see if some small changes would be ok or less costly.