They sound spectacular in both 2.1 and 5.1. This makes it difficult to decide which format you want to use while enjoying a good Concert DVD.
For example. Listening to the following over a cold one...http://www.netflix.com/Movie/David_G...0?trkid=226870
Every five seconds i kept switching My surround from Pure direct to All Channel Stereo to Dolby digital Pro Logic Music. They all had their own unique characteristics and they all sounded exceptional on the Aperions...
For Example. 2.1 LPCM streaming at 3.0Mbps pure direct sounded so Clean, Crisp, Loud and Powerful, i was amazed at how my 5T's filled my room and ears from 12 feet away.
Switching to All Channel Stereo provided a little more depth to the soundstage and filled out staging around the listener. The vocals were a little more forward with the introduction of the 5C. A matter of Preference i suppose.
Dolby Digital 5.1 was a little bit of both.
I must admit, i think it's the Denon 3805's fault for offering all these surround modes to choose from and providing some nice power to, however you can't discount Aperions role in making all the surround modes sound most excellent.
To conclude...I spent more time switching between sound modes than i spent focusing on the DVD. That my freinds it the eternal ?. What's the best way to enjoy my Aperions?