I have a Sony STR-DE485 Stereo Receiver, with two Floorstanding Sony 3Way Speakers, and a center channel sony speaker. My question is, I play music through the receiver and when in surround mode, it mostly plays from the center channel, leaving only the floorstanding speakers for minimal sounds. Then if I put it in 2 channel mode, the floorstanding speaker sound great, bass and everything, but the center channel doesnt play at all. How can I just play all my speakers to their max when I play music?