Sanders amps. He has one just for magnetic planars about 1000 WPC . I have heard his other ESL amps and they are superb.
Another choice is the widely lauded Wyred 4 sound. It is a class D, but 6 moons said was warmer sounding than the Pass amp Sjean just happened to have in at the same time. That must be something and the price is quite low. I am happy with my tube amps driving cones and domes otherwise I might consider one quite seriously for myself. I never did figure out how to biamp, thus I won't buy one just for my woofers.
Another choice is the widely lauded Wyred 4 sound. It is a class D, but 6 moons said was warmer sounding than the Pass amp Sjean just happened to have in at the same time. That must be something and the price is quite low. I am happy with my tube amps driving cones and domes otherwise I might consider one quite seriously for myself. I never did figure out how to biamp, thus I won't buy one just for my woofers.