Atma-sphere OTL S30 Amp with Green Mountain C3 sp

I can tell you two things:

1) Roy at GMA told me personally that he's used the S-30 on C3s with good results.

2) My 28W 845-SETs drive the C3s very well - the S-30 ought to be very similar, though I believe it's output impedance is somewhat higher.

Try asking Ralph Karsten's opinion at Atma-Sphere.com. He might know better than anyone else, unless someone has that actual combination in usage. Sounds to me, however, that it may produce an excellant match. Happy Listening! P.S. I am using the M60 mark 2.2's, and have been very happy. When I did my auditioning, I noticed that the sound of the Atma-Sphere's was pretty much constant throughout all of their models, the only differences being in power output.