I've heard a few carbon fiber diaphragms.
IMHO somewhere between the PET type diaphragms and beryllium. I don't know if I would agree with comparable to beryllium.
Both are light and stiff.
The carbon fiber will flex differently- they are certainly going to be different in breakup mode.
On a 4 inch diaphragm, much of the perceived HF is from breakup.
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