Mark and Daniel Ruby - with NuForce ClassD?

The new class D amps seem to work with some and not with other speakers. I have a friend looking to pair Mark and Daniel Ruby's with a NuForce amp. The stereo one, not the monoblocks. Anyone know if that will work well or horribly? Ruby's are some of the most inefficient speakers on the market so I want to make sure NuForce Class D is up to the challenge!