Don't even think about it . I have the Contours and they really suck up the power. Besides requiring a lot of power, they are a four ohm speaker. SET's like an eight ohm or higher load. If your thinking about going single ended I would consider the Pass Labs Aleph amps. They are single ended class A solid state amps. The Aleph 4 (100 wpc stereo amp) or the Aleph 2 (100 wpc mono amps) would be a good match. They are no longer in production, but can be found used. There are many reviews of the amps at Audio Review.com. If you want to go the low power SET route you will have to get different speakers.
