Just got a pair of AKG K240 Sextett Cardan, what so important about these headphones? Also do these have variable impendence, because I don't understand why it had a badge that say 4 - 600ohm.
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They're not necessarily 'important' as such, they just have a reputation for being a good 'gateway drug' for getting into vintage headphones.
Notably, they actually sound good and are comfortable 'out of the box', and many copies have stood the test of time since they are fairly robust studio headphones.
The sound is actually quite coloured, however it's mostly balanced with decent bass and treble extension, with emphasis in the 'right' places.
There reason why they might be considered important, is because they were the first and only headphone to ever feature 6 passive diaphragms in the baffle as part of the tuning design. Each passive diaphragm was the same size as the main active driver's diaphragm.
In later model/revisions these were replaced with various fibrous-sheet filters as AKG later aimed to tune towards a Diffuse Field curve, the K241 being the first headphone to ever be tuned with this 'standard' as the goal, so in that way, the K241 is actually a more important headphone historically.
( Coincidentally, Pioneer was doing something similar around the same time with their 'variable chamber' concept, which was essentially a passive corrugated 'ring-diaphragm' around the driver. In some ways, this was a better solution, but was limited to smaller scale on-ear headphones. )
"4-600 Ohms" in this case refers to the specifications of the amplifier you are plugging it into, as it should be able to handle loads up to 600ohms.
Back then, it would have been plugged into a speaker amp/AV-receiver with 2 different specifications for the rear speaker taps and the front headphone-out.
- The headphones drivers are rated 600 ohms.
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