I have a Panasonic SCDP1 DVD-V/DVD-A/CD mini system connected via an Optical Digital cable to a SONY HTK250 Dolby digital home cinema system. I recently purchased a DVD Audio, which sounds fantastic in high quality stereo through the Panasonic speakers. However when I play the album in surround through the Sony unit it only registers stereo, not 5.1 surround. When I play the DVD-Video interviews on the disc it plays automatically in 5.1. Anybody got any ideas what Im doing wrong?