Come on people! Lambda is the name given by Denon to their D/A converters, something about reducing zero crossing errors or something. I remember this from my low-end days. Here is a link that has a tiny bit of info on this topic. So its not a feature, its the type of D/A thats in the box. I found a link. Here it is.
http://denon.jp/asia/PRODUCTS/sseries/DCDS102d.html
http://denon.jp/asia/PRODUCTS/sseries/DCDS102d.html