hello, I have the old speakers RTA 15T for my main speakers. I'm looking for a center speaker to match these old speakers. I use my system 50% for music and 50% for movies . My av receiver is onkyo ds797. I tried cs400 center but too big and won't fit my audio cabinet. I'm looking at this new csi40 center speaker but still not available on market. Also, just ordered f/x 500i for the surround left and right sperakers. I would appreciate any advice.