I heard them recently off very good Mac SS amplification. Very nice, detailed musical with nice soundstage and imaging, but a tad edgy sounding for my tastes, which surprised me a bit with the mac amp.
I'd like to hear them running off a Wyred st-1000 which might come in used these days towards the top of the target price range. Other Class D icePowers as well as long as well matched to pre-amp.