I think Von uses DSU for most music and DTS NeuralX for most movies.
I use NeuralX for most movies and music. I hardly ever use DSU, so that Dolby Restriction would NOT apply to me much.
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If I'm trying to save money, I would just get an AVR and not even worry about external amps.
You could not use NeuralX upmixer if the program is recorded for Dolby.
Denon customer service told me that the newer recievers that have Dolby Virtualization will not allow cross upmixing. Dolby is forcing this not Denon.
This is the only reason that I recommend the 4500 over the 3600. Other than that the 3600 is fantastic.