Take a look at this denon 5800 upgrade digital broad. http://www.dvdrama.net/menus/ces_day1_68.jpg Beside the denon link (i think like firewire connection with a denon dvd9000), there is a EXT IN of digital coaxial input (4 of them) is label within the regular 5 digital coaxial input. How are we going to use this? Can we use a combination of 2, 3, or 4 of them to connect mutichannel digital input of a future DVD-A or SACD etc...? Anyone has any input?