Just a thought...
Dolby Digital Plus
What it is: An enhancement over standard Dolby Digital, DD+ offers higher bit rates and more efficient compression, resulting in improved sound quality. It can also support movie soundtracks up to 7.1 discrete channels (though honestly, the vast majority of Hollywood movies are only mixed for 5.1). On Blu-ray, DD+ is encoded as an extension to a "core" Dolby Digital AC-3 track.
Level of support: Unfortunately, DD+ is optional on the Blu-ray format, and not all disc players are required to support it. Many players will simply read the 640 kb/s core and disregard the extension. As a result, most movie studios prefer to use either basic Dolby Digital AC-3 or some of the other advanced formats.
How to get it:
* Toslink or Coaxial SPDIF - SPDIF cannot carry a full DD+ signal. If you use this connection method, the player will limit output to the Dolby Digital AC-3 core.
* HDMI - If the player does not support DD+, it will simply extract the AC-3 core, in which case see the Dolby Digital listing above. Some players may decode the DD+ to PCM and transmit it over HDMI (any version). Other players will instead choose to transmit the DD+ bitstream to a receiver for decoding, but this requires HDMI 1.3 connections on both ends of the chain.
* Multi-channel analog - Either the Blu-ray player will extract and decode the AC-3 core, or (on some models) will decode the full DD+ and convert it to analog.
Panasonic TC-P50ST60 plasma HD television, Onkyo TX-SR805 and PIONEER ELITE VSX-47TX receivers, Klipsch RB-75(2 pair) and RB-61 bookshelf speakers, Klipsch RSW-10, RSW-12(2), Velodyne HGS-12, HGS-18 subwoofers, OPPO BDP-103, PS3 80G, PIONEER DV-525 dvd player, Klipsch RS-42 surrounds, Klipsch RC-52 center channel