Hawaiibadboy
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Though maybe carbon nanotube makes them stave off distortion longer to compare to 50mm regular diaphragm headphones? Idk. But jvc really seems to like their carbon.
The SZ series has a Carbon diaphragm for the 55 and the 30mm 2nd driver is cnt. Those seem very mild and even at insane bass levels the 30mm never seem to stress or get to loud but that's a dual driver config.
I've not tested the 40mm cnt drivers. The claim in other JVC threads is they do something but I've never seen the wow??