A friend recently bought a pair of these Sonus Faber speakers and they are wonderful speakers. He's driving them successfully with both solid state (Proceed) and tube amps (20 watt 300B push-pull, custom-made).
The only problem is that they sound quite a bit better if you sit on the tweeter's axis -- this is noted in the owner's manual -- which means either tilting them forward (thus messing up their time alignment) or maintaining a high seating position. It helps if you're tall! But even seated off-axis, they're pretty great. Really good bass, given the size of the drivers. Good luck, Dave
The only problem is that they sound quite a bit better if you sit on the tweeter's axis -- this is noted in the owner's manual -- which means either tilting them forward (thus messing up their time alignment) or maintaining a high seating position. It helps if you're tall! But even seated off-axis, they're pretty great. Really good bass, given the size of the drivers. Good luck, Dave