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Old 8th October 2012, 06:21 PM   #11
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An alternative would be to laminate the pole piece, but apparently no one found an easy and cheap way to do it.
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Old 8th October 2012, 09:00 PM   #12
KSTR is offline KSTR  Germany
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I think I'll try this asap with some cheaper bass drivers I have around, it's quickly done and who knows...

a) Measure the voltage, if any, between the yokes with a very sensitive diff-amp.
b) Redundantly, connect the yokes with the lowest possible resistance and measure current, if any, with a precision current clamp.

I don't expect to see anything (the professional driver designers would certainly know this trick after some 100years of experience, me thinks), but who knows...

Then if there is something, multitone distortion testing of the driver's impedance would certainly show a difference (IME much clearer and more reliable than acoustical measurments).
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