xEcuToR
500+ Head-Fier
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True that yet I must say companies stopped making electrets a while ago because they are more sloppy and distorted at lower frequencies. AKG K340 itself is a good example since it uses a DD for bass.
Definitely newer materials might be able to tackle this problem better but I wonder how satisfying a solution it will be for hi-end audio enthusiasts or will it be applicable to us at all. Warwick audio and their FFLs will find use in PA systems in offices and other requirements where saving space is necessary perhaps but a single complete solution is far from achievable with their current product. Here is an FR curve confirming roll off below 1000 Hz... Its very common that companies come up with a new name for old technologies and consequently call it an invention of their own ... That's a marketing gimmick. Of course Warwick uses a laminate of sorts but the underlying principle is not new as they claim it to be.
http://www.warwickaudiotech.com/sites/default/files/downloads/Warwick%20Audio%20Data%20Sheet%20I.pdf
Which version of AKG K340 have you owned or heard to come to that conclusion about K340s?