Hi, I have recently bought a PS3 & been enjoying watching many great films on Blue-ray. However when i tried to play Casino Royale last night i was disappointed to discover that i could not hear the film in Dolby Digital. My system comprises of the following, PS3 connected to plasma through HDMI, audio is sent to my (old) Harman Kardon AVR8500 receiver through optic fibre cable BUT, the amp says that it is not receiving a Dolby Digital signal & instead processes the signal as Dolby pro-logic 2 ?????? My question really is, can the 5.1 uncompressed pcm signal be decoded by my older amp & why can't the amp decode the standard 5.1 signal ???????? Help would be greatly appreciated.