While the K701 is a regular open-design phone with dynamic driver, the K340 employs an electret driver for the high frequencies, a dynamic driver for the lower frequencies, and six passive radiator technology like in the K240 Sextett. Indeed the K340 have highs, instrument separation, and speed that the K701 can only dream of. If you know that this phone was sold at $300 in 1980, then you would immediately realize that in today’s money, it would outclass today’s top-of-the line AKG, the K701/K702. On a gain 8 Beta 22 (Single ended), playing classical recordings out of a desktop CD Player, the volume is on 1 O’clock position. Thus for this review we will stick to using the Beta 22 amplifier. Ideally, you would plug these in to a speaker amp, but having experienced driving headphones with some speaker amps, I find that while powerful, they don’t have the refinement in sound that headphone amps have. The K340 is one of the hardest headphones to drive, second only to the K1000. The exterior is the same, but you will notice the difference once you plug in the headphones, and/or by dissecting the headphone and seeing the colour of the driver. The now discontinued K340 had several versions while it was produced. The headphone is highly innefficient, requiring only the most powerful kind of desktop headphone amplifiers, and definitely more suitable driven by a speaker amplifier. This was a top-level cans back when it was produced.
The AKG K340 is a one of a kind headphone produced by AKG that employs two drivers system: Electrostatic and Dynamic in one cans.
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