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Nanocrystaline material have much lower core losses: hysteresis (material) and eddy current (thin laminations)The question is how important is this for a SE audio transformer? For SE the transformer is biased with a current and because of that there is always a magnetic field. So the advantage of the much lower hysteresis loop of nanocrystaline materials is highly reduced in this case, only for very low frequencies at very low exitation you can measure (and maybe hear, we talking about 8Hz- ...20..30Hz) a differance. But because nanocrystaline materials can not have a high exitation level (1,25T vs 2T for SiFe) copper losses are much higher.At higher frequencies the advantage of the very thin core laminations is still an advantage but i think also not so important as many people think. The exitation level at higher frequencies drop with frequency so the eddycurrent loss is reduced too, and the multilayer winding technique reduce the problem too. Remember that most transformers have "high" thd at low frequencies (<100Hz) and not for mid/high frequencies.The biggest advantage for hightech materials is for very low signals and specially PP (ac signals only)Anyway i like that J&K make such transformers, they look better then anything else i have seen from the commercial manufacutures before. I would like to see measurements from Docere to comfirm the data from J&K.
hiB is not a better core, a different core what for SE can almost do the same. In some parts better, other a bit worse. But, much more economical.
M6 is cheaper and less good then HiB.
