I CURRENTLY HAVE A PAIR OF EPIC SERIES CF1 FRONTS AND KV3 FOR CENTER.FOR THE SUB I HAVE A KSW 12 AND SOME OLD BOOKSHELF SPEAKERS FOR REAR.WOULD I BENEFIT IN ANY WAY UPGRADING TO THE RF52II FRONTS AND RC52 CENTER AND RS42 FOR REARS.MY LIVING ROOM IS 20 BUY 12.ANY SUGGESTIONS WOULD HELP.