Dual membrane high excursion planar magnetic bass driver Part 1 - Building 

Who thought we'd see Isobaric planar bass? Fantastic stuff

Dual drivers make sense for low bass. Very smart stuff.

Hihi, I meant air passages not between the panels, on the main frame make some passages from center to outside like wave guides. You will lower the pressure between the panels, as well the resonance will be lower. In current configuration the speaker works like closed box, that is why you have higher resonance

I believe drivers that , in use , have large excursion also have high intermodulation distortion with multiple frequencies . Larger is better for bass , IMO . Especially for open baffle and planar .

Genious at work!

Amazing work, probably you should make some air passages between the panels, that will lower the resonance and lesser distortions

Awesome video again! Thanks for the upload, really appreciated. Are you using regular ferrite magnets? Thanks!

Nifty AF

very good idea to lower the distortion without using a push pull magnet arrangement.... at the expense of efficiency if the resonance frequency were reduced to the same value as the single membrane arrangement, I guess for rising the sensitivity with same magnet and magnetstructure, there are the three known posibilities, ...reduce distance of foil to magnet...increase the resonance and... or...increasing the radiation resistance by increasing the radiation area of the foil... a dipol with deep and loud bass has to be very huge...my dipols have 2 square meters radiation area per side and approach at 30 Hz the 100 dB range 😊 for higher sound pressure level or a pressing sound the use of a subbass box speaker under the 50 Hz range is neccessary....

whoaaaaaaaaaaaaaaaaaaa this is cool...

So an isobaric speaker that sort of works like a magnet-to-cone config in that it cancels asymmetry. The distance is small so it should work rather well. The question that I have is what is the impedance of the slots between magnets. Microphones have quite elaborate hole matrix in the plates to dampen the diaphragms. I think I'd start with filling this area with felt.

Where did you get the coils from?

Could you make a sub from them, panels on two faces of box?

Would you consiver selling such a bass panel (to someone in the Netherlands)? I don't have the equipment to make one and I am very interested!

did you ever build a planar with a Halbach array ?

What is the name of the material you use as a membrane?

where did you get the mylar and what foil are you using?

Is there such thing as a hard diaphragm planar? Instead of flexible membrane use something like cardboard idk. It'll have a separate suspension and possibly less distortion. I know it'll be heavy but you can put more thicker traces to keep the sensitivity. Just an idea I have in my head. Finally someone that made a planar subwoofer!!!