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Autoformers are not a free lunch

True, they will help to drive a low impedance speaker, but the best cure for that problem is not to buy a low impedance speaker. For the gain in current, you lose proportionately in voltage. (An autoformer, like a transformer, can only alter the V/I ratio.) I don't think (emphasis on "think") your issue with the 63s is primarily low impedance. Again, I yield to Ralph, since he seems to know what's up with 63s.


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