Audio Physics Virgo owners

I have heard these speakers numerous times both the II's and III's and love them, my question is will a 20 watt mono 300b tube amp have enough power to drive them? My current speakers are 92 db @ 4 ohms and these amps drive them with ease. Any experience with these speakers with low powered tube amps?
Personally I would give them more power. I started with a 50 wpc integrated and have moved up to a 125 wpc (8 ohms) and it helped quite a bit.
The 15 watt Cary 300SEI 300B tube amp was one of my very favorite with the Audio Physic Avanti. Drove them with ease in my 12x16 foot L shaped room.