Loudspeaker magnet assembly refinements

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Ist there any technical/engineering/theoretical info available on the net related to Scanspeak's "Symmetrical Drive (SD-2) motor"? Are there even FEMM-Models around? Searching the net, I could find strictly nothing besides the usual promoblahblah.

Wavecor might have implemented something similar, and instead has some technical background infos handy handy for it's proprietary "balanced drive" magnetic assembly:
https://www.wavecor.com/Balanced_Drive_technical_paper.pdf
 
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