How to get Dolby Prologic IIx to work with my 4308

Hey Everyone,

I'm having trouble getting my denon 4308ci to produce Dolby Prologic IIx. Does anyone have this receiver? I have a 7.1 set up and would love to be able to listen to all of my channels with a 5.1 movie. I've been told that movies don't have to be encoded with Dolby Prologic IIx, you just need a receiver capable or producing it. Does anyone have any experience with this?

Thanks