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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





AKG K 340

 K-340
The K-340 headphone surpasses even the most elaborate electrostatics in transparency and accuracy. It has deeper and more precisely defined bass than is available from the most  expensive loudspeakers, while also being completely free from the effects of room acoustics. Every detail of the sound is clear and natural, and the acoustic image is better localized than with any other headphone available. Listening fatigue is the biggest enemy of headphones - but you can listen to thecoloration-free K-340's hour after enjoyable hour.
 A headphone's acoustical performance is academic if it is uncomfortable to wear, so every unnecessary ounce of weight was eliminated. The K-340 - despite its dual transducers and crossover networks - weighs about the same as an average open air headphone. Side pressure against the head is very low, and the large ultra-soft urethanefilled circumaural earpads may be removed for cleaning. The headphones are supported by a wide, soft headband with raised pads which not only permit air to circulate, but also provide flexibility to conform to the exact curvature of any head. Strength is supplied by a dual-bow bail above the headband. The bail terminates in a pair of self-adjusting slide fittings that automatically position the earpieces at the proper height.
 The K-340 comes with a 3 meter coiled input cable that terminates in a standard ¼" stereo phone plug. The cable's flat, side-by-side conductors are specially designed to reduce kinking. The input cable is brought directly to the left earpiece, and the headphone bail carries audio to the other earpiece, doing away with distracting "Y" cords under the chin. No detail has been overlooked in the design and every detail is revealed in the music for your enjoyment.
Specifiactions
Transducer Types:  Dynamic moving coil low-frequency system; Fixed-charge electrostat high-frequency system.
Frequency Range:  16 Hz to 25,000 Hz
Crossover:  4000 Hz , 6 dB/octave
Nominal Impedance:  400 Ω, each channel
Sensitivity:  1,6 Pa/volt
Nominal Listening Level Requirements:  0,63 V (1 mW) for 94 dB SPL (approx. 1 Pa)
"IHF Sensitivity"  rating 5,0 V (63 mW) for 112 dB SPL (approx. 8 Pa)
Sound Pressure level for less than or equal to 1,0 THD:  104 dB (200 to 2,000 Hz)
Maximum Continuous Input (per channel):  9 V (200 mW) approx. 117 dB SPL
Cable:  3 meter (9,8 feet) 4 conductor cable with 3-conductor ¼" phone plug.
Weight:  385 grams (13,5 oz ) less cable

Contact Force:  Approx. 3 newtons (10,5 oz)
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