How to calculate inductance of foil

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in that application your hookup wire and/or transformer will probably swamp any inductance due to the ribbon.
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Theres still no way to calculate it? I'd like to develop a PSpice model which incorporates all of the elements of the combined circuit (loudspeaker + amplifier), including all parasitic effects.

If I saturate the steel to 2.2 tesla, I believe its permeability approaches that of air and might be assumed a constant.
 
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