One thing that Bill may have forgotten to mention - Jerry Hubbard said the voice coil flux density measurement could vary depending on the method used. Bill mentioned this to me, too - that the amount you measure depends on the method you use. That could account for the difference between the Altec spec sheet and the current measurements.
Bill Hayes might be able to shed some light on this - I need to call him and see how he's doing anyway - I'll let you guys know what he says as to the way they measured it back then.
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