For all of you interested in this thread, this is the only add on dolby digital processor in existence for pro-liogic receivers. If you were like me, and spent a lot of money on a high end pro-logic amp before DD came out, this is your key to avoiding obsolescence. I bought one of these from Audio Advisors this summer on a closeout for $300. It works very well and is almost invisible in the system. When I pop in a DVD, the Vantas unit kicks in and takes over and changes to Dolby Digital. It senses the level of your main speakers and adjusts the center and surrounds accordingly.
The link above to pcliquidator is not specific about which of their 2 units they are selling. The DPA-P87 is for Dolby Pro-logic systems, and the DPA-S50 is for 2 channel stereo systems.
I have spoken with the reps before and this is supposed to be upgradable in the future for DTS and other formats, I don't know the status of these upgrades now.
the link to vantas is:
www.vantas.com
THIS IS A REALLY HOT DEAL!!!
P.S. know I'm drooling over this product, but I don't work for vantas or pcliquidator