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RE: Planar headphones

I'm not 100% with your model.
The reason I like stronger magnets is that if the driver/pole piece spacing stays the same, sensitivity should go UP. I'm not going to go into the handling of Ultra Strong magnets, which I assure you CAN be hazardous and must be done with respect. A pinched finger may be the least injury you could expect!
If you increase spacing, sensitivity should go down, but the possible EXCURSION of the diaphragm should be increased. That should help bass a lot.
Now, the rub? You must come to grips with the physical properties of Mylar AND as more force is placed on it, the driver frame starts to come into play as well. Mylar isn't very 'stretchy' (modulus of elasticity) which is good, and it does have a fairly high tensile strength, also good. At higher excursions, I suspect transfer to torque on the driver frame. A better way of securing the driver to the wood/mdf part of the frame may help this.
Just thinking out loud, as it were.

Too much is never enough

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