I have no clue why DSP is even needed for the center channel, I was under the impression that signal processing is done via AVR. I tried to look into the Axiom DSP page but I couldn't find more info on it.
The DSP for the centre channel is entirely optional. It is simply to further smooth and straighten the response curves for the centre channel speaker. I currently have the VP180 non-HP and I did get the DSP for the centre but haven't tried to do any comparison between with and without the centre DSP. As I understand it the differences would be fairly subtle.
If you like to use Audyssey or some equivalent technology, you may want to check with Axiom on whether it is compatible with the LFR's and centre DSP. In the worst case scenario it might not work at all, and I think it would be very tricky at best to have it work in a positive way at all.
I am not using any form of digital room correction in my system.
