I had the Berning MicroZotl(headphone amp) with my Lowthers, and I found it to be a wonderful sounding amp, but just a little too weak to get the volume levels that I wanted in my large room. I have since moved up to another Berning SET ZOTL amp which is superb.
Depending on the model of Lowther driver, and the efficiency level, you should be able to get a nice SET amp like a 2A3 or 300B to work very well with your speakers.
Depending on the model of Lowther driver, and the efficiency level, you should be able to get a nice SET amp like a 2A3 or 300B to work very well with your speakers.