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Estimated price (community-sourced)
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The AKG K340 is a discontinued hybrid headphone introduced around 1979, featuring a unique combination of an electret transducer handling frequencies above 4 kHz and a dynamic moving coil driver for frequencies below 4 kHz. This design aimed to leverage the strengths of both technologies, with the electret driver providing detailed high frequencies and the dynamic driver delivering the bass and midrange. The headphones have a closed-back design and employ passive diaphragms similar to those used in the AKG K240 Sextett. The nominal impedance is approximately 350-400 ohms, requiring powerful amplification, typically desktop headphone amplifiers or speaker amplifiers. The frequency response ranges roughly from 11.5 Hz to 23 kHz, with a sensitivity around 122 dB SPL/V. The K340 is noted for its detailed treble and midrange but has some issues with bass extension and a somewhat uneven frequency response, including a notable notch around 1300 Hz likely due to driver interaction. The sound signature varies by version, with some described as bass-light and others as more neutral or 'bass heavy.' The headphones have a cult following for their unique sound and historical significance as one of the first electrostatic-dynamic hybrids, but they are considered challenging to drive and less comfortable than some contemporaries due to weight and fit. They are no longer manufactured and are considered vintage collector's items.
Driver and acoustic performance characteristics
Headphone driver and design characteristics
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Components that show up alongside the K340 Hybrid in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The 99 Classics's sensitivity is 103 dB against the K340 Hybrid's 122 dB, its impedance 32Ω against 375Ω, its high-frequency extension 25 kHz against 23 kHz, and its low-frequency extension 15 Hz against 11.5 Hz.
The 99 NEO's sensitivity is 103 dB against the K340 Hybrid's 122 dB, its impedance 26Ω against 375Ω, its high-frequency extension 25 kHz against 23 kHz, and its low-frequency extension 15 Hz against 11.5 Hz.
The Spirit Classic's sensitivity is 102 dB against the K340 Hybrid's 122 dB, its impedance 32Ω against 375Ω, its high-frequency extension 22 kHz against 23 kHz, and its low-frequency extension 5 Hz against 11.5 Hz.
The SR125's sensitivity is 99 dB against the K340 Hybrid's 122 dB, its impedance 32Ω against 375Ω, its high-frequency extension 20 kHz against 23 kHz, and its low-frequency extension 20 Hz against 11.5 Hz.
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