Some Blu Ray players have Analog 5.1 outs, and for the most part all of them are now being able to decode TrueHD or DTSHD internally. Dolby Digital Plus right now tops out at 1.5mbps (on HD DVD, but has the potential to go up to 3.5mbps). Where as Blu Ray lacks Dolby Digital Support (i think). Which is why all of the Dolby tracks, unless its TrueHD are 640kbps on Blu Ray. Which isn't much of an improvment over the 448kbps tracks on DVDs. Its actually less than the DTS tracks current on DVDs which are 768kbps.
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