Originally Posted by sdurani
All the mainstream products that can do cross-codec upmixing use DSP chips, so that's not the issue. Nor is room correction limiting upmixing (they're unrelated). I don't know enough about the RS20i to tell you why it works the way it does.
There is no technical issue, because for everyone, having the current software version - before the DTS:X beta - DSU is working on DTS tracks.
I got the information from Datasat UK, this is what I can say, but I cannot comment on it, this is their statement. As I wrote already, I don't mind, because why not using DTS:X for DTS tracks and DSU for Dolby. If the reason for this is correct or not, I also cannot tell you. I just copied a part of an e-mail answer from Datasat on my question about why in some cases the post-process is not shown.
In this answer it was also mentioned, that they are still working on this and other things. Again, please don't forget, that this is BETA software and not the final software.
I was also told some time ago, that the reason the AP20 doesn't decode Dolby and the RS20i does, is due to the different areas the products are aimed. The AP20 is a professional product and the RS20i is for home users. Therefore, the sentence that Dolby doesn't like its DSU used on DTS tracks sounds somehow logical for me. May be different measures for Datasat because they are DTS? Honestly, I don't know.
But if Craig Eggers said something different and all other main stream AVRs can also do it, this is surely funny to hear something like this and raises questions. I agree.
I am completely neutral in this case and I am only sharing what I know here.