If you have the money you could ask Frank Van Alstine to make the Fetvalve 550 stable to 1 ohm. I know it's stable to two ohms. Van Alstine has a user forum on Audiocircle.com. I also have learned that it's easily the best amp I've heard. The Blue Circle I owned though was neck and neck with it just not near the power and far more money.
I certainly see your problem. Maybe you should try some planar type speakers that are easier to drive.
I certainly see your problem. Maybe you should try some planar type speakers that are easier to drive.