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Here's the results of a triangle shaped capsule, inspired by Ehrlund.?

I've shaved off a lot of the parasitic capacitance and the output is definitely higher. It's still sounding pretty narrowband mid-heavy. This one was done with about 150g of weight for membrane tension and the usual Scotch tape as a spacer.

I'm going to try increasing the backplate thickness with a second layer of PCB or maybe some acrylic to see if it gives better highs.