This would allow you to use the DD/DTS DACs in your DVD, SACD. DVD-Audio player in lieu of those in your receiver by using six analog cables instead of one digital interconnect.

For DD/DTS DVD players, even if your DVD had the ability to provide these outputs (most don't) it's debatable wether or not you would hear an improvement.

Where these would be necessary is if you used a SACD or DVD-Audio player as I can'tthink of any current receivers that do this decoding. These MUST be done in the player and transferred to your receiver via six analog cables.