.....My "system" as of now consists of 4 Polk Audio T 15 bookshelf speakers and 1 Polk Audio PSW110 subwoofer all driven by a Pioneer VSX 1120K receiver.I would like a recomendation for a Polk Audio center channel speaker. I have looked at the Polk Audio CS10. I understand they are timbre matched with the TSx series speakers. I have also considered using a single T 15 speaker as a center. I have had Polk Audio Speakers since 1986 ( Monitor Series ) and still have 'em! Thanks for the help!!