To my surprise, I just discovered that using the Sony blu-ray, BDPS500ES, through its analog outs to the AV9, is sonically better with legacy Dolby Digital and DTS than the sound of both through the AV9. Sonically, what you get is a purer, more liquid sound that is more of a window to the source. I now use the Sony BDP-S5000ES for to play back 5.1 Dolby Digital and DTS. In fact, through the S5000ES, its sound on legacy surround is better the EX and ES through the AV9. I am shocked.