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

Yamaha YHD-2

  Each of Yamaha's exciting new headphones has been designed to offer an optimum blend of high-fidelity music reproduction, sonic efficiency, and extended fatigue-free music enjoyment. The most immediately striking aspect of the YHD-2 natural Sound Stereo headphones is the sophisticated new design by Mario Bellini, a world-famous designer highly appraised for his ergonomic "human-engineering" approach to styling. Bellini's new design enables the YHD-1  and YHD-2 to be worn for hours on end without a trace of fatigue. Yet the deeply detailed musical transients and exciting sound dynamics are both products of Yamaha's exclusive Orthodynamic design.  These headphones are also remarkably efficient, meaning that they deliver generous levels of sound output with astonishingly low levels of distortion from comparatively low input levels. When used with portable headphone stereo players with minimal output levels, they deliver truly larger than life performance.
How Yamaha's Orthodynamic Design creates better sound.
Despite widely differing acoustic conditions for headphone sound reproduction, most headphone designs just use loudspeaker-type drivers that have been scaled down for headphone use. Yamaha took a completely different approach, designing the entire headphone driver unit from scratch. The result was our orthodynamic design. It consists of two sintered ferrite magnets with a combination voice coil/diaphragm sandwiched in between. The YHD-2 uses isotropic type-magnets,  for even sharper response and higher efficiency.

Magnetic Flux and the Voice Coil / Diaphragm.
The disc-shaped driver magnets are actually sets of distinct magnets, coaxially arranged with each successive one in opposite polarity. In between, there is a combination voice coil/diaphragm constructed of super-thin lighweight polyester film only 6 µm thick, corrugated in the direction of movement for optimum compliance. It's fixed only at the outside edge for maximum freedom of movement. This diaphragm is printed with aluminum voice coils wound in opposite direction, so that the diaphragm 'breathes" back and forth in precise response to the music signal. Openings in both the disc driver magnets and the driver body permit the air flow necessary for unimpeded diaphragm movement for strong bass response, while felt and urethane foam damping materials provide optimum load to the diaphragm for natural sound response over the entire audible spectrum.

Your ears will tell you what the specs confirm.
Both of these headphones deliver extremely well balanced response across the entire audio spectrum - 20 Hz all the way up to 20,000 Hz. The output sound pressure level, which is the amount of sound produced for the power input, is a remarkable 97 dB/mW for the YHD-2, and a spectacular 100 dB/mW for the YHD-1. performance this efficient enables you to enjoy genuine Yamaha naturas Sound fidelity even with today's popular portable headphone stereo players. Indoors or out, you'll never be without the finest sound quality ever possible from a headphone.
 Specifications  YHD-2
Impedance:  125 Ω
Magnet Diameter:  ø38 mm (1 ½")
Magnet Material:  Isotropic Ferrite
Diaphragm Diameter:  ø38 mm (1 ½")
Diaphragm Film:  6 µm Polyester
Frequency response:  20 - 20,000 Hz
Output SPL:  97 dB/mW (106 dB/V)
Rated Input:  0,7 W
Cord:  2,4 m (8 ft.) straight
Weight [cord/without cord]:  155 g (5,6 oz) / 133 g (4,7 oz)

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