I've just upgraded from RF-3's to RF-7's and I'm looking to upgrade my KSW-12 to a RSW-12 or RSW-15. The room that my setup is in is fairly small and Music listening is more important than home theater. My local dealer feels that the RSW-12 is tighter than the RSW-15. I haven't listened to the RSW-15, but have compared the RSW-12 to the KSW-12, which is night and day. Was looking for some opinions on this before I buy.