To be quite honest, you were NOT clear or OBVIOUS in any way. You spoke like you were a three year old holding a crayon, scribbling on construction paper trying to tell mommy and daddy what you were thinking.
You asked if anyone was using PDVD9 and the Xonar together and if they had success. Sounded more like you may have tried to use them together and ran into problems while doing so, but were somehow too obtuse to figure it out.
In other words: Be move verbose and don't attack the people who are willing to try and help you out when you post in a forum for support type questions. It's generally a bad idea.
So, to answer your question... yes, it is compatible. You may have issues doing so as some parts of the Xonar driver do not play well with PowerDVD, but they do work together.