Well, if you're trying to get the 5.1 channel sound you're going to *have* to use the analog inputs on your 2105...the only Denon deck(s) that use the digital hookup for DVD-A and SACD right now are the 3805, 5803, and the 5805...and they only use the denon link for only the DVD-A (you still need the 6 cables for SACD). You'll get sound from the digital hookup with your deck, but it'll be the Dolby Digital (or possibly the DTS) for the DVD-A...not the discrete 5.1 surround. Denon keeps claiming that the Denon Link will carry the SACD signal when it's approved, but they've been saying that for a year or two now; I'll believe it when I see it at this point.
Bryan...been down this road...