Don’t know about Denon, but my Marantz THX set up is not much. You just select the surround back distance apart (wide or close), select the number of SB’s, and then make sure the fronts are set to small. It’s pretty anti-climatic to say the least.

I haven’t decided if I like THX post processing or not. I most definitely would not buy any receiver on the merits of having THX. The THX Ultra cert is worthy I suppose, but not the processing peace.