@1graber2
I am using ICEpower 25 ASP based mono blocks. One under each speaker. Literally. :)
My ribbons are from Mundorf. Sound fabulous, but electrically VERY different than a ribbon.
Ribbons tend to be very low impedance, and need a matching transformer.
AMT's have no need for a transformer, and are almost purely resistors (relative to most drivers).
Best,
E