seeeen them every now and then, still would like to replicate such a thing just for fun. i thought about vacuum forming the membranes. probably exactly how they made these to begin with. should not be toooooo hard or costly. swapping out the copper wire for alu might be an upgrade to, swapping out the ferites for neos's and off you go . an play forever with the dimples and type of palstic and damping and suround that makes it able to move. in this case its the plastic itself i believe.
The dimples don't seem to have any functional purpose except for rigidity/maintaining pistonic action, not much flex at all when I press down in the center. From the feel of them they're about half as thick as typical hard packaging plastic. The surround is a separate part the dia is glued to, 2 tiered pleated accordian, looks like treated fabric, very thin. The whole dia/coil former is one molded piece. The wire is wound around the integral former. Same material as the dia.
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"If you look closely, you can see that there are deliberately unevenly distributed notches along the length. There is a reason. In this way, on the one hand, resonance is avoided and, on the other hand, bundling at higher frequencies is avoided, as is usual with uniform membranes."
"If you look closely, you can see that there are deliberately unevenly distributed notches along the length. There is a reason. In this way, on the one hand, resonance is avoided and, on the other hand, bundling at higher frequencies is avoided, as is usual with uniform membranes."
@Pano, i also have 4 of these Sawafuji loudspeakers. I think i will try to use them in my next loudspeaker project. Never gave them much credit.
How high will you take them? Seeing as they were used as tweeters in a 2-way, do you think they'll suffer at the top end?