You must calibrate the analog outs from the 2900 for SACD/DVD-A, since this is the only way you can hear them, and this will apply for movies as well if you use the Denon to do all processing (DVDs). However, I would opt for a digital connection for movies because the 3805 has auto EQ and better bass management.
John, thanks, I am using Component video cables and an optical cable for the sound. So with these cables how should I do it? Do I just leave the settings on the DVD Player alone and set it to digital out?
i calibrate my multichannel analog connection by calibrating the receiver's external inputs, and i leave the player's speaker level settings alone (default). it shouldn't matter where you do it, though. it does the same thing; calibrates the player's analog connection.