I try to listen to movies in the format in which they are on the DVD. Thus, with a 5.1 soundtrack, I listen in 5.1, but with a mono soundtrack, I listen just through the front center. With DPL encoded films, I watch them with DPL. If I encountered a movie that was 2 channel and intended to NOT be decoded as DPL, then I would listen to it as 2 channel. With a 6.1 soundtrack, I listen in 6.1. Basically, I do not want to alter the soundtrack from the original.