Yamaha HP-3 headphones

Yamaha invites you to enjoy a private word of musical enjoyment. Light, and with the gentlest of ear-pad pressures, the HP-3 headphones are a transparent window on the world of music.

Wide frequency response and low distortion combine to give a clear and uncolored reproduction superior to the finest loudspeakers. And you can enjoy the full, shattering sound levels of hard rock, or grand opera, without disturbing those around you. They also assure faithful and delicate reproduction of a whispered vocal, or a solo violin. Orthodynamic design is the secret.

With the HP-3 you may well forget that you are wearimg headphones. But you will never forget the thrilling realism that they bring to your private musical enjoyment.

Specifications;

Type:  Orthodynamic Type

Impedance:  150 Ω

Diaphragm Diameter:  46 mm

Sensitivity:  93 dB/mW, 101 dB/V

Max. Continuous Input:  1 W

Max. Input: 3 W

Weight: 210 g (with cord)

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Yamaha YH-1000 (1978)

These headphones feature Yamaha's exclusive Orthodynamic Design, a concept radically different from conventional dynamic or electrostatic types. Instead of an ordinary voice coil and diaphragm, it uses an ultra thin, low mass, polyester film diaphragm, sandwiched by a pair of powerful disc magnets. The voice coils are photo-etched on the surface of the diaphragm. The performance that results is marked by smooth, even response over the entire audible frequency range, low distortion, and clear imaging. The YH-1000 is a delight to wear, also: the earcups use a supra-aural design which eliminates listening fatique, and height and tilt adjustment ensure comfort over long hours of use.
"YH-1000 ia an orthodynamic headphones which has emerged as a fruition of Yamaha's unique technology of acoustic equipment development. YH-1000 is provided with a capacity of distortion-free broad band reproduction from heavy low sound to ultra high band which is characteristic of a horizontal drive system. YH-1000 also incorporates a rare earth element magnet which generates strong flux and an aluminium diecast housing which eliminates unnecessary vibrations. These features contribute to the production of powerful yet clear sound. YH-1000 is the outcome of our quest to provide comfortable feeling of fitness to your ears and ease in use, which we hope you will find satisfactory".

Specifications
Type: Orthodynamic
Diaphragm
diameter: 50 mm
Film diaphragm: 12 µm polyester
Coil diaphragm: 9 µm copper foil
Magnet: Cerium series cobalt
Frequency
response: 20 - 20,000 Hz
Sensitivity: 103 dB/1m/1W
Impedance: 100 Ω
Rated input: 3 W
Max. instant.
Input: 10 W
Total Harmonic
Distortion: 0,3% or less at 90 dB SPL
Weight: 500 g (1 lb 2 oz)