Planar sub - did "we" build one?

And can someone with better unsderstanding describe how its done...

"...rather than having a flat ‘voice-coil’ placed in front of a magnetic array (a situation that means that the larger the excursion, the further the voice-coil – and diaphragm – moves from the magnetic field) the Orthophase design places the wires of the voice coil on stand-offs, behind the diaphragm and contained in deep, U-shaped magnetic channels, so that they remain firmly within the field’s grip."

Something like...

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The pdf above end with.... "and induces eddy current into vibrating elements..." hmm, eddy currents are highly non-linear och something that we try to avoid in normal speakers...

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Wow, 9 Hz resonance. Makes sense. Seems amenable to DIY construction (really should be posted in the Planars loudspeaker forum). 300 lbs.

Obviously has sound coming out the back but the manufacturer chooses to pretend it is only a bit of venting. Phony because they think customers avoid dipoles?

B.
 
Good point about Q, but it shouldn't matter being outside the passband unlike all Rice-Kellogg sub drivers?

While anxiety about dipole interaction in a normal room (and spaced from the back wall) is exaggerated, I believe, it is sure to have some effect with this driver.

Maybe this is long-sought harmonious sub "match" for ESL speakers.

B.
 
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hmm interesting , i believe someone made something like this here ? forgot who it was. but it resembles more and more a normal dynamic driver except not using a round voice coil 🙂 i believe the person used this white plastic with hollow beams in it ? like poly carbonate stuff for transparent roofs in carport