Ahh, I see. For other readers, to reach 130 dB with the Fazor model, you need 4W. Most recommend 120 db as a good target, which would be 0.5W. For the older non-Fazor models, double the power requirements (as they are 3 db less efficient). Audeze states 1-4W is preferable, though for Fazor models I think those bounds should be cut in half for just pure volume requirements. I'll expand on this below. The NFB-28 will do about 6W, Lyr 4W, and A28 2W... all should be plenty sufficient, especially on Fazor models. If we're just going for power, the NFB-28 wins
(I love mine, though have never heard any other amps with cans I know well enough).
I've never heard of someone needing 130 dB peaks, even under most people's 'loud' volumes, peaks will usually not come close even to the 120 dB goal. In fact, many use the 120 dB goal as a high achieving goal, to make sure that you can get enough
clean power into your cans. When you push an amp into the higher volumes, it can cause excessive distortion. Having power overhead is never a problem in my book, so people using 100W (or what have you) speaker amps in my book might be justified... I'd love to see some THD type measurements into headphone loads. Considering how many people love it (I never hear bad things)... it's something I feel I should try.