Bwhite- The Berning is not a true OTL since is has a transformer inbetween the tubes and the speakers- hence making it NOT an output transformer less amp. There is a big difference, the magic of an OTL can not be rivaled in the right system.
I was looking at the sonus faber web site and they weren't too specefic, but if these speakers do in fact have 92dB and are a 4 ohm load it may be a stretch for the amps. If you listen to complicated music, or listen loud and want dynamic's it isn't going to happen if your room is remotely large. I think if you could wait the 150s would be ideal. Having heard the 300hp(which is essentially a bridged 150, just with twice the power) I don't think any one could go wrong with these amps, all of the magic of the 75 OTL's with effortless power available.
I was looking at the sonus faber web site and they weren't too specefic, but if these speakers do in fact have 92dB and are a 4 ohm load it may be a stretch for the amps. If you listen to complicated music, or listen loud and want dynamic's it isn't going to happen if your room is remotely large. I think if you could wait the 150s would be ideal. Having heard the 300hp(which is essentially a bridged 150, just with twice the power) I don't think any one could go wrong with these amps, all of the magic of the 75 OTL's with effortless power available.