[Lovediy]

I've only ever seen flat ones from the headphones I've taken apart.

If you have hifiman then I can see them making the membrane completely flat. The HE400 that I once removed, the planar membrane was completely stretched flat.

 

[Philimon]

While I do agree you may not be able to hear these tiny peaks and dips in the FR, I think higher end planars don't do this. Or at the least better QC.

I am making planar IEMs and have been for 2 years ish. Feel free to ask anything. I'll tell you right now that if a driver membrane is crinkled in random patterns, you WILL get random blips and dips in the frequency graph. Does it matter? Up to you!

Youve been making the drivers yourself?

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Not all are flat, some are corrugated.

Not all are tensioned, some are clamped at edges with a loose fit or center-pinched with free edges.

Tensioning perfectly evenly around circumference is difficult or so Ive heard. Would explain the wrinkles you see in some diaphragms and possible cause for sound variance.

Audeze marketing blurb on some of their tech.

 

[redrol]

Yeah, all of that is right. Not much else to say.