Originally Posted by Bing
Why does the A2 output in DTS via optical anyway? I know that DD+ and TrueHD downconversion is necessary for optical or coaxial transmission, but why DTS and not DD?
Simple--backwards compatibility and horsepower needed for DD vs. DTS encoding.
1. Processors and receivers that are DTS-capable will accept a DTS bitstream up to 1.5Mbps, whereas only up to 640kbps for DD.
2. The computing horsepower and DD encoding process for a 448/640kpbs DD bitstream is more complex than that for a 1.5Mbps DTS bitstream. So some cost is saved.
3. Some would argue (including myself) that a 1.5Mbps DTS sounds better than 448kbps DD.
Thank both Dolby and DTS for allowing this to happen. Without agreement from both parties, this transcoding would not have happened. This, IMHO, is by far the most logical way to ensure maximum backward compatibility, while maximizing sound quality for these transcoded stream.
I would encourage you to experiment in your setup between the transcoded DTS SPDIF output and 5.1 analog bypass (assuming your player also has 5.1 analog output). I would say that in most setups, the differences will by anything but starck. But I'd guess that in almost every case, a transcoded TrueHD track will sound noticably better than any standard DD and/or DTS track from a regular DVD.