I'm in the process of of purchasing ML Vantages. Always been a SET/Back loaded single driver guy. I had MLs a while back and have alway missed them. I do think that point source speakers are the way to go. I'm wandering, since ML Vantages cross (I think) 470 Hz plus it's driven by it's own amp. Seeing the panel is 92 db efficient, will a 50 watt tube amp drive them?