New Wilson - Wamm Master

Could it have been the music selection; the styles were completely different in each room?

I don't recall the DAC being used in the small room with the Sabrinas. 

I demoed Sabrina in the same large room as Alexx last summer.   I forgot the DAC and compared Momentum and 200iq with VAC SigMKIIa SE pre.

What what kind of cross-overs?

Wow I heard the MSB mono amps at CES three years ago on the Rockport Altair's. The worst sound I ever heard. Dark, dark, dark like you put a cloth over the speakers. I actually thought the speakers were defective.  The next day at CES the Absolare 845 mono blocks arrived and the speakers were reborn. It had some of the best sound I ever heard at a show.