Hattor Ultimate Power Amplifiers

tomflyn, you have ESLs and I think you are barking up the wrong tree.
ESL lovers generally shy away from class D amps because they have a tendency to sound harsh. I think you would be better served by getting something like the Parasound A21+. For the same money you could get two of them strapped. They are high bias class AB amps. I use ESLs and use the same type of amp. In the near future I will shift back to pure class A which I think is the ultimate for ESLs. The Amps that Sound Labs recommends most for its speakers are the Atma-Sphere MA 2 and the Parasound JC 1+. 

mijostyn nails it again. Class D is not an optimum match for electrostatics. It may "drive" them fine, but if you care about quality of sound, just say no.

It’s ignorant to clump all class D into the same basket
It could be your passive Kuzma. I had the Hattor passive, and although I loved it, I think there was an Impedance mismatch with my class D amps. Upgrading to the advanced input buffer (~$350) + shipping back to Poland. If you’re handy you might be able to order them an install yourself

Depending on your budget there’s a pair of Merrill Veritas for sale < $5K
and PS Audio M1200s with tube input stage should be available now

I have a Audio Alchemy DPA-1 + PS 5 that I replaced the Hattor with. It made a big improvement. It's for sale on AA and USAudiomart

Thanks guys. I managed to borrow a Son of Ampzilla 2 from a friend. And just coming out the gate, barely warmed up, it is clear that stepping away from the Class D monoblocks is my direction.