I?ve got a really nice sound system to go along with my really nice display ? the high-def audio codecs contained in Blu-ray discs make a huge difference to me?possibly more than the much improved picture over DVD?.depending on the film though
I'd agree with that. But the 5.1 surround codec comes with the HD download as well. I have yet to make the 7.1 jump yet as there is not enough on the market in my eyes to justify the jump, but I eventually will. By the time I do, I'm sure the 7.1 codec will be in the download (if it's not already - I haven't checked in a while).
One of the main differences I've noticed with newer DVD/Blu-Ray players is when folks use an optical cable the player itself selects the correct audio out codec (Dolby D, Dolby EX, Dolby Pro Logic, DTS etc.) and your stereo adjusts accordingly. That makes a huge difference in the sound quality, especially for those that don't take the time to fully understand their equipment. The quality was probably always there, the user just didn't know it. Now it's nearly fool proof.
I don't use 7.1....very few releases have 7.1 soundracks to them as you said. 7.1 is usually achieved by the receiver or pre/pro overlaying some sort of addtional processing on top of the exitsting 5.1 stream.
What i'm referring to are the Dolby Digital HD and DTS HD Master soundtracks that are included on most blu-ray disks. These codecs can't be passed over digital toslink or digital coax connections - not enough bandwidth. They must be travel via bitstream over HDMI to a reciever or pre/pro that can decode the codecs. If the receiver or pre/pro can't decode the format your not dead yet.....but you'd need a blu ray play that can decode them natively and then (not all can) output them via PCM over HDMI, or even over 5.1 analog outs to the receiver or pre pro, but analog is not as good because then all bass management options must be set on the player and these options are very limited on most BR players.
If you haven't heard the new codecs on good equipment and you're into this stuff and have the $$ to make it happen, you won't be dissapointed
*edit - saw your previous post after i posted this. In short though, the quality i've come to enjoy via BR disk is not avialalble via yet from any download service. Someday soon, but not yet.