its amazing, airy, soundstage is great with class a amp. im paired it with d90se and dont forget turn on setting 0 db from 4v to 5v.
The Singxer is only class A in low gain mode if you don't listen very loud. I think it was like 0.5 watt before it changes to A/B.
But i still love the Singxer.
Using it in high gain mode with high Z and the DC Aeon 2 Noire.
Focal Elegia in high gain as well because I'm to lazy to change it every time