Hi I have a sony Bravia tv model number kdl-32bx300 and dvd home theater dav-dz170, the set up i have is hdmi for video and optical for sound and when i have it on the dvd i can hear all the speakers but when i switch it two the tv or ps3 all i hear is the twofront speakers and sub how can i hear the surround sound when watching tv orps3.?