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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





Sennheiser HD-430 headphones

With HD-430 Sennheiser offers "new generation" headphones featuring improved magnet and sound-surround diaphragm design. Said to be "virtually distortion free", the headphones weighing only seven ounces provide audio frequency response from  16 to 20,000 Hz. Hearmonic distortion is put at less than 0,5% (DIN 45 500). This performance is achieved by use of a new diaphragm design and of a more powerful magnet weighing one-third as much as those made of conventional materials. Model HD-430 is also the first Sennheiser headphone to combine an open air design with circumaural ear cushions which lightly surround the outer ear to separate the ear from direct contact with the inner foam pad and yet permit all the advantages of openxerts a handband pressure of only about three Newtons which is an index of listener comfort. Typically. Open air headphones have half the headband pressure of conventional closed headphones, says Sennheiser. Impedance is 600 ohms per channel, and sensitivity (nominal spl at 1 kHz) is 94 dB at 1 mW input. HD-430 is provided with a 10-foot stranded-steel cable with stereo phone plug.

Performance
A very comfortable pair of headphones with very light pressure on head and ears. Suspension headband is somewhat difficult to adjust for optimum fit. Sound quality is slightly bright. Definition is exceptional. Efficiency is much higher than average, and headphones can be driven to high sound levels with relatively little power. Extremaly clean sound.

Specifications
Frequency Range:  16 Hz - 20 kHz
Impedance:  600 Ω /channel
Nominal Sensitvity SPl (at 1 kHz):  94 dB (1 mW input)
Harmonic Distortion:  less than 0,5%
Weight:  7 ounces
Cable:  10 foot cable and stereo phone plug



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