Originally posted by: Arnie.d
I think the optical output is for all digital audio output (not just digital PCM but also DTS and DD).
PCM and DTS are output through the optical output, but Dolby Digital (AC-3) is stored in an analogue channel on the disc and is output throught the RF coaxial output (on the 925 - the 2950 doesn't have an AC-3 output). I think the optical output is for all digital audio output (not just digital PCM but also DTS and DD).