Signal Processing with Magnepans

Does anyone have any experience with signal processing with the Magenpans, such as a Lexicon MC-12 or a preamp with Audyssey MultiEQ, either Pro or 32? I am wondering about the time delay cleaning and if that would ruin the Magnepan sound.

Also, the 20.1s and associated power requirements are out of my budget. Which of the smaller ones with what mods would be the closest one could come to approach the sound of the 20's?

Thanks, B
Model 1.7. No mods.
I've used Audyssey with my Apogees (5' out from the wall) fine, no problems when taking 8 measurements.

I took 6 measurements at ear level around the listening position, and two higher up, and behind the couch.

Good sound.