I have owned Spectral equipment before, and think very highly of it. I never found that Spectral mated well with anything other than Spectral. Its great stuff, and especially magical if you go all the way (Spectral+MIT), but its a committment.
Pass Aleph P vs. Spectral DMC-20
I currently own a Spectral DMA-200 amp. Am currently having some custom speakers made with all Focal Audiom drivers, custom x/o. Will also be running the big Snell sub with an Ashly pro amp on the bottom. I know the DMC-20 is somewhat of a dedicated piece for Spectral amp, but have read many good things about the Pass Aleph P (but haven't heard one yet). Haven't gotten to the interconnect/speaker cable issue yet; that's for last. Which is better for my system?