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"the chamber where the magnet is (would it be perm magnet of electromagnet) is absolutely decoupled from any paths where sound flows"
The situation is the same as the backside of a woofer looking into a closed enclosure, and this relationship is audible.

Also, actually in a compression driver, there will be a narow opening between the inside of the speech coil and the central polepiece in the magnetic gap thru witch the throat and the phaseplug slits are connected to the inside of the magnet!! Audible? I dont know.

"In fact some drivers has no chambers for magnets and keep the space wide open"
The question is if they would sound different if this space where closed?

I think that now that you will make some experiments it would be a pitty if your results would be determinned by something else than what you are exammining, especially since it would be so easy to avoid (by putting something into the perm magnet)  Also it could open up for some new possibillities voicing.

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