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RE: Thermal Distortion Paper

Correct additional observations, well presented.

To further add to your "hysteresis" comment, almost all speaker crossover makers, pro or home types, us Iron Core Inductors (Chokes) on the woofer section for several reasons.

1) Copper is more expensive than iron and 2) Using less of it with an iron or ferrite core gives lower DC Resistance (DCR) for a given milliHenry value. with possible/variable non-linear saturation and Hysteresis relating to Material Coercivity, Permeability, etc. over the different power levels

3) doing an Air Core Inductor on a woofer requires a 10 or 12 gauge wire to maintain as low of a DCR as an iron core inductor, which is bulky, heavy, and Expensive! 4) The THEORECTICAL benefit is it's lack of Hysteresis and impossibility of Saturation.

Which begs the question for those who spend the extra money on one:

Does it make an Audible difference? If so, what and where is it? On the top end of the woofer response? Or the low end?

So many questions.


Edits: 03/19/25
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