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A pair of head-mounted speakers that are positioned over the ears. For listening to music or monitoring live performances, both left and right channels are required. Although often called headphones, when a microphone is included for telephone or video calls, the device is technically a "headset."

Some of the Best Sound
Headphones allow listening to music without disturbing others, but they are also used by discerning audiophiles. High-quality headphones can provide an extraordinary listening experience that is far more affordable than room speakers. Headphones are driven by much lower amplification, and by creating a sealed listening chamber, they can sound as good as or better than stereo speakers costing many thousands. There is also no need to configure speakers for surround sound to match room acoustics. See earphones, virtual headphones and headset.

A Venerable Model
Grado Labs' SR60 headphones debuted in 1994 and are still being sold more than two decades later. Grado is a small, committed company in Brooklyn, New York that celebrated its 50th year in 2003.

One of the Best
Using mahogany speaker housings, the Grado Labs' GS1000 has been considered by audiophiles as one of the finest headphones ever made. It even makes a mobile device sound like a theater hall.

Wireless Headphones
Numerous wireless models are also available such as this unit from Sennheiser. Wireless headphones use FM radio frequencies as well as the 2.4 GHz band and Bluetooth. See Bluetooth.
References in periodicals archive ?
The technical details (titanium-coated diaphragms, neodymium iron boron in the magnets, oxygen-free copper in the voice coils) suggest that the Tugo has a lot in common with the PRO4AAT and PRO3AA phones that are at the top of the Koss lineup of full-sized dynamic stereophones.
"We would really like to continue to be the only other source for stereophones."
The input and output devices currently in use are gloves that sense the movements of hand, fingers and arm; body suits that monitor body movements, HMD's or 'head mounted displays' that show the three dimensional environment; and stereophones that relay three dimensional sound.
Coffee, Bedford Heights, Ohio; Remington Products, Bridgeport, Conn.; GE Lighting, Cleveland; Bonjour, New York; Carlisle Plastics Inc., Syracuse, N.Y.; Poulon Weed Eater, Shreveport, La.; Syroco, Syracuse, N.Y.; Southwest Cupid, Black-well, Okla.; Koss Stereophones, Milwaukee; and Brinkmann Corp., Dallas.