I can give advice on Power 1 and 2. Does that count? I auditioned both for my Martin Logan speakers, and I found them to be excellant amplifiers. The sound and build quality is superb. Although my previous amplifier was a solid state class-A Threshold, I have not regretted my decision. With the Power 1, I still look forward to a listening session, and the excitement from my purchase 18 months ago has not diminished. Ultimately, I bought the Power 1. Why? Two reasons: the power differance to my ears and in my system was negligible, and the tube replacement cost is much less. After auditioning tube amps from other well known high-end manufacturers, Sonic frontiers seemed to offer the most value. Good luck!
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