I have a 5803 and I am contemplating the upgrade. For only $100 it seems to be well worth it. I must now ask the dumb question....The upgrade gives you D-Link 3rd. I understand this is a port for the transmission on digital signals, BUT...Will this only interface with a Denon source unit? Are there other digital players out there that offer this output? If so, do they not have to be SACD/DVD-A players since the receiver would process the signal? Any help is appreciated and hopefully I don't look like to much of a 'tard. Thanks