When I bought some Alexia 1 a couple years ago, I took my Audio Research REF 75SE with me to pick up the speakers and to listen to them with my amp. There was much written about those speakers being hard on amps due to the impedance dips. That guy had a McIntosh MC452 so we compared his 450 solid states wpc to my 75 tube wpc. We did not have to adjust the preamp volume...they had the same output volume and the REF 75 sounded better to both of us.