Right now the amp drives a pair of ML-Sources due to space restrictions. I also have a pair of older yet wonderful ML SL3s but at a different location which I would like to try with the w4s one day. I am sure it will do fine.
Granted that the little Source has its limitations (in terms of uniformity I would say) it is still very very transparent and still...an electrostat.
Driven from XP with KS and Jriver, the W4S combo sound is wonderful. Never harsh, yet very detailed. Cables are DH labs (BL1 balanced ic & Q10s for the speakers). I also hookedup an old DVDp as transport that was lying around (with a Theta Coax cable) and still the sound was fairly nice, very smooth and relaxed, but felt that using JR with a good USB gave a cleaner sound, more transparent, but never harsh. I actually enjoyed this combo tremendously.
Driven from XP with XXHighEnd, there is additional clarity over JR as if a veil lifted, it is more focused and it does feel a bit brighter now but in a nice way, with some recordings. Nevertheless, the 3D image is outstanding and most recordings sound very good.
I would assume, since the DAC2 is dual differential balanced, theoretically it may be better to drive a dual mono setup with balanced ics. I havent listened to the MF A3.2 Cr amp but given the MF pedigree it should be very musical sounding. Can it be something in the cabling or the speakers themselves?