Boulder 866 Digital vs McIntosh MA12000

I have an MC452, which I like a lot, but I also have a Boulder 866 and it is a considerably more refined and nuanced sound with much greater space, dynamics, and speed.  I think the Boulder sounds a bit warm, dealer thinks it's very neutral, but we agree that it sounds special either way and definitely never fatiguing or hard edged.  Considering your speakers, which are on the revealing side, the 866 should be an excellent mate.

Then again, for some McIntosh fans, there is no substitute. 

I pair an 866 with Wilson DAW's, and I think the sound is every bit as enjoyable as when I had my Lamm ML2.1 SET amps and MAXX's. Maybe more neutral, but so natural sounding, fast, incredible bass with no harshness at all. I don't think you'll be disappointed.