AKG K-240
Among AKG patents, none is more significant than the Passive Diaphragms found in K-240 (K-340, K-3) models. Mounted within each earpiece, they perform two distinct functions when activated by sound waves. – They are acoustically transparent above 200 Hz, and one listens in a virtually “free field”. Unwanted mid- and high-frequency peaks and valleys of conventional circumaural (closed) headphones are eliminated. Sound enters the ear in a “normal” manner as in supra-aural (open) headphones. –Below 200 Hz, combined with acoustical “screens”, they form a controlled, damped vent to flatten out any bass peaks, thus eliminating boominess common in most circumaural headphones, and extends linear response lower than would otherwise be possible in supra-aural headphones. The result is pure listening pleasure, you hear tone gradations often lost in loudspeakers or in the listening room environment.
The Complete Free-Field Headphone
The K-240 is the first totally sound and comfort engineered headphone incorporating all the features necessary for complete listening enjoyment; accurate stereo imagery, outstanding fidelity of reproduction at all listening levels, extreme comfort with virtually no fatigue under prolonged use, and uncomplicated ease of use.
The Passive Diaphragms
in the K-240, the compliance of the passive diaphragms, combined with acoustical resistances, forms a controlled, highly damped vent to counteract and flatten out the resonant peak. This eliminates boominess down to a lower frequency than would otherwise be possible
The K-240’s unusual construction improves wearing comfort, reduces weight, and totally eliminates annoying user adjustments. Its soft, perforated support band shapes easily to the head and simultaneously self-positions the headphone driver elements comfortably on the ears. At the same time, AKG’s exclusive Cardan (universal-joint gimbal) earpieces automatically, independently, and correctly self adjust to each ear for optimum listening contact.
K-240 utilizes Passive Diaphragms and acoustic “screens” for controlled response and “free field” realism. Dynamic transducers provide accurate reproduction and high output. Universal gimbal (cardan) suspension for each earpiece with self-adjusting headband is comfortable to wear over long periods. Favourite of recording and broadcast studios.
Common to all AKG headphone designs, the circumaural K-240 possesses outstanding features which increase wearing comfort, fit and flexibility of the headphone. Unique self-adjusting headband and cardan-swivels locate the earpieces precisely and accurately regardless of head or ear shape, long-term wearer fatigue is eliminated. Weight is distributed uniformly over wide headbands. In environments where noise could be a problem, circumaural headphones are an ideal selection. And remember, the patented “Passive Diaphragms” yield qualities equal to the most natural listening environment.
Specifications:
Operating Principle: Dynamic moving coil
Frequency Range: 15 – 20,000 Hz
Sound Pressure Level (thd 1,0%)
108 dB (at 100 – 2,000 Hz)
112 dB (at 1,000 Hz)
Sensitivity: 20 µb/V
Normal Listening-Level Requirements: 0,5 V (0,4 mW) for 94 dB SPL (=10 uv b)
IHF Sensitivity: 4V (27 mW) for 112 dB SPL (=80 µb)
Nominal Impedance: 600 ohm per system
Maximum Continuous Input: 11 V (200 mW) =121 dB SPL (per channel)
Total harmonic Distortion: (at 95 dB SPL): 0,3%
Weight: 224 g (7,9 oz) without cable
Cable Length: 3 m (10 ft) ¼ inch phono plug
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