Class d amplification

I have the Atma-Sphere Class D driving Quad ESL 63s for four months.  These speakers are revealing and I can listen all day to decent source with no fatigue.

I think the Atma-Sphere and Orchard entries are very much worth auditioning. They are two excellent amps with different sound profiles.

https://futureaudiophile.com/atma-sphere-class-d-gamono-amplifiers-reviewed/

https://futureaudiophile.com/orchard-audio-starkrimson-mono-ultra-premium-amps-reviewed/

I am looking at Class D Audio GaNFet amps. 
Curious as to what pre-amps are pairing well in the class D world. 

@hbarrel I use a Schitt Freya with mine.