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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 HD40 headphones


Here's more proof that no one combines extraordinary sound and extraordinary comfort quite like Sennheiser HD40 headphones, weighing in at an incredible two ounces, are the lightest-weight standard series Sennheiser Open-Aire headphones ever.  Yet, despite their unusual compactness, they continue the Sennheiser tradition of superb clarity and definition over a wide frequency range. plus rugged reliability, for years of musical enjoyment.
The Sennheiser HD40 offers an additional advantage, a new standard of value, out performing headphones many times its price. and the stranded-steel cable sets a new standard for durability.
For use with your portable walkaround you can get the same kind of superb sound and easygoing comfort with the Sennheiser HD40W.
Audition them today. You'll hear - and feel - the difference.

Specifciations:
HD40
Frequency Response:  22 Hz to 18 kHz
Impedance:  600 Ω (may be used with 4 ohm to 600 ohm outputs)
Sensitivity Nominal :  90 dB (SPL 1 m / at 1 kHz)
Total Harmonic Distortion:  1,5% (at 94 dB SPL)
Weight:  2,0 ounces (without cable)
Cable:  10 foot stranded-steel with molded standard 1/4" stereo phone plug
 HD40W
Impedance:  42 Ω
Sensitivity:  94 dB at 1 mW/1 kHz
Cable:  4 foot stranded-steel with stereo phone mini plug
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