As this picture begins to unfold; the responses don't surprise me. These HA speakers pass on the characteristics of the respective amp as Darrel so well stated
Keep in mind I am also biamping. Amps I have used with the HA include:
low watt amps such as the SPUD paint a marvelous musical picture, as does the Decware SE84; these are wonderful music reproducers, whose only limitations are on the power end for those who like to crank things up. They are magical on low to mid volume levels in my large room
I have found SE amps in the 8 to 9 watt range can have that same type of magic and be very, very satisfying for 95%+ of what I listen to. In very rare occasions; when I want to listen at extremely loud levels to complex music or rock they begin to run out of steam. If I could only have one amp; personally it would be one of these for the combination of musicality and power. My current favorite is the Sophia Electric 91-01 300B. A value option is the Dennis Had Inspire 807, Dennis is the retired founder of Cary and is building amps as a hobby. Very sweet sound amp. Have the 807 in the system right now
For when I want to get insanely crazy with bringing the house down, I put in a set of Quick Silver Mono 100's. As you have heard here, Quicksilver makes wonder sounding gear loved by many with their HA speakers. Couldn't go wrong with any of the QS products
You mentioned class D. I ran a Wyred for Sound putting out 540 watts per side.
Awesome sound and limitless power; but to my ears not the musical magic of glass. Sold this one.
many, many options; as you have been reading. It is finding that right combination that you enjoy for your type of listening
this is all part of the enjoyment of this musical adventure
Amps: McIntosh MC30''s, Dennis Had 807, SPUD, Merrill THOR's, Pre: Warp Speed, Mac MX110Z, Analog source: Linn LP12, Digital source: Mac Mini, Grover Wire/Cables, HA Rainier Reference #001