Even 250 watts as a stand alone spec won't necessarily provide what is needed to power these properly. Trust me, I own them and love the sound of them, but it took a Krell 400 cx (even a 300 cx wouldn't do, I tried!) to finally get them to "light up" and pump clear, textural bass as they were designed to. Also, you need current to get them to warm up and sound sweet and delicate when called to do so. When you get the power right though, they are wonderful speakers.
An amp that doesn't flinch into 2+ Ohm territory is de rigeur.
An amp that doesn't flinch into 2+ Ohm territory is de rigeur.