The four-patterned C414 became available just as 16-track recording became the industry standard. Both the CK12 and CK4 used the capsule with an accurate, transparent midrange along with a clean and extended high-frequency response, it became an extremely popular studio mic with the BBC.
The discontinuation of the brass-ringed CK12 capsule prompted a new nylon-based design that gave the C414 a warmer sound. When some engineers found the C414 a little leaner, it prompted the release of the C414 EB (Extended Bass).
Read more about this here: http://www.musictech.net/2018/05/vintage-rewind-akg-c414/
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