Dual membrane planar magnetic (both active driven)

[WrineX]

Here’s an interesting dual sided diaphragm and most likely have a symmetrical magnet arrangement on both sides of the screen View attachment 1308727

dual membrane or dual coil (back and front) i think the later, since they used the wiggle patern to create overlap

 

[WrineX]

Im not sure but havent they just showed clarisys with out the magnets ?.

https://pbs.twimg.com/media/GLXFLKPb0AAZilT?format=jpg&name=large

looks like a claris , copy of apogee dual coil

 

[WrineX]

Maybe your driven mass is too heavy for the magnets .Lack of control.
Have you tried to measure thiele small values .Too high Q value.
Underneeth here some measurements of my AMT´s . One with soft film PVDC Saran and one with mylar.
Might be different aluminium thickness too

Bernt Båndsei

Ill try making a measurement of the thiele small, with a foil like this is pretty hard weight wont work. maybe known liters box works? maybe the high Q is visible in the impedance measurement, as a pretty peak im sure it is

 

[esl 63]

To measure the Q you use the resistance method!

 

[WrineX]

well i mean Qts , i can do a normal impedance sweep. would be a peak in there as well. then again it does not say all that much , since a FR would also show the peak