Bitstream is the undecoded Dolby Digital and DTS data that will be properly decoded by your receiver. PCM is short for Pulse Code Modulation. I'm not an engineer, so I can't explain the technical details to you, but PCM is the basic technology of CDs. When your player is set to output PCM, it is...
If you're using analogue connections, then sonic characteristics can vary greatly, and in some surprising ways. If you want an anecdotal account of DAC comparisons between players and receivers, I started a thread about that here . If you use two players connected by the digital output to the...