Ah, I got it.
I did not have the input selector on the 2500 sent to multi channel, so the DVD-A was routing coming through the coax cable, and the audio portion of the DVD was doing the same?
Then, I figured out that the "SACD" selector switch on the front panel of the Denon toggles between SACD & (redbook)CD.
I thought that switch was just for controlling the SACD format output.
So now it is playing all formats.
Additional question.
If I have the 2900 hooked up to the 2500 with the 6 ch. inputs, and the composite video, is there a reason for me to use the digital coax cable if I am always going to use the DACs in the Denon when playing music?
Thanks Curtis for coming to the rescue!
