on the subject of dolby vs speilberg:

DD: DTS:
448 kbps 1.5 mbps (3.35 times)

DD EX matrixed DTS ES discrete
surround back ch surround back ch

no audio cd DTS CD

DD/Meridian (dvd-a) DTS CD plays on std
forces consumer dvd player
to buy new hdwe.

DD concert video DTS concert video
too much compression hell freezes over

16-20 bit-48k 16-24bit-48/96k

if it weren't for dts and sacd, i shudder to think how long it would be before we saw any improvement over ac-3.
just one man's opinion.