An electret driver functions along the same electromechanical means as an electrostatic driver. However, the electret driver has a permanent charge built into it, whereas electrostatics have the charge applied to the driver by an external generator. Electret and electrostatic headphones are relatively uncommon. Original electrets were also typically cheaper and lower in technical capability and fidelity than electrostatics. Patent applications from 2009 to 2013 have been approved that show by using different materials, i.e. a "Fluorinated cyclic olefin electret film", Frequency response chart readings can reach 50kHz at 100 db. When these new improved electrets are combined with a traditional dome headphone driver, headphones can be produced that are recognised by the Japan Audio Society as worthy of joining the Hi Res Audio program. US patents 8,559,660 B2. 7,732,547 B2.7,879,446 B2.7,498,699 B2. Circumaural headphones (sometimes called full size headphones or over-ear headphones) have circular or ellipsoid earpads that encompass the ears. Because these headphones completely surround the ear, circumaural headphones can be designed to fully seal against the head to attenuate external noise. Because of their size, circumaural headphones can be heavy and there are some sets that weigh over 500 grams (1lb). Ergonomic headband and earpad design is required to reduce discomfort resulting from weight. These are commonly used by drummers in recording.

Mittory Bluetooth Headphones Over-Ear Lightweight Wireless Mittory Bluetooth Headphones Over-Ear Lightweight Wireless

Nathaniel Baldwin began manufacturing the first modern headphones. He crafted them in his kitchen and sold them all to the U.S. Navy. This was the first time a pair of cans resembled something you’d see today. Baldwin never patented them, however, because he was an idiot. Source There were similar ideas in the past, but many people consider Nathaniel Baldwin to be the inventor of headphones. All because Baldwin’s invention included some notable advancements from previous designs. Sony's first focused efforts to develop monitor headphones began at a time when CDs and digital recording were starting to take off. The first pair was nothing but mini speakers covered in cardboard and foam but he managed to improve them and create the first hi-fi stereo headphones. They got the name Koss SP/3 and they consisted of two brown plastic cups, 3-inch speakers covered by a light plastic cover, and foam cushions for extra comfort. The cups were connected by a headband made from metal and the whole appearance is quite similar to the modern headphones. The headphones were much lighter than before with the overall weight of 3-5 pounds. Apart from the looks, their sound was improved as well, since the headphones used different signals for each ear, which approximated the sound of concert halls to the ordinary people.

The electrophone was an early, but important, step

US 4460809A,Henri Bondar,"Process and device for converting a periodic LF electric voltage into sound waves" Not realizing the huge potential, Baldwin invented the first headphones in his kitchen in Utah as a device to help him hear the sermons at his local Mormon temple. French engineer Ernest Mercadier in 1891 patented a set of in-ear headphones. He was awarded U.S. Patent No. 454,138 for “improvements in telephone-receivers…which shall be light enough to be carried while in use on the head of the operator." [14] The German company Siemens Brothers at this time was also selling headpieces for telephone operators which had two earpieces, although placed outside the ear. These headpieces by Siemens Brothers looked fairly similar to modern headphones. The majority of headgear used by telephone operators continued to have only one earpiece. [15] Wireless telegrapher Fessenden with two head-mounted telephone-receivers, ("headphones"), 1906

History of Headphones - AudioReputation The History of Headphones - AudioReputation

Greenfield, Paige (25 June 2011). "Deaf to Danger: The Perils of Earbuds". ABC News. Archived from the original on 14 December 2013 . Retrieved 20 June 2013. John Koss wasn’t only innovative in his creation of the first stereo headphones. He also made significant advancements in marketing. The Beatlephones released in 1966 were branded headphones with a partnership between Koss and The Beatles. In 1958, John C. Koss, an audiophile and jazz musician from Milwaukee, produced the first stereo headphones. [26] [25] Smithsonian, Captain Linwood S. Howeth, USN, “The Early Radio Industry and the United States Navy,” History of Communications-Electronics in the United States Navy (1963): 133-152; Peter John Povey and Reg A. J. Earl, Vintage Telephones of the World (London: Peter Peregrinus Ltd., 1988); Friedrich Kittler, Gramophone, Film, Typewriter , trans. by Geoffrey Winthop-Young and Michael Wutz (Stanford, CA: Stanford University Press, 1999); Virginia Hefferman, “Against Headphones,” The New York Times (January 7, 2011); Mark Schubin “Headphones, History, & Hysteria” (2011), http://www.schubincafe.com/2011/02/11/headphones-history-hysteria/ ; “Koss History,” http://www.koss.com/en/about/history ; Google patents Other Articles: Who invented headphones? The first headphones were invented in 1881, making this the most significant year in the evolution of headphones. Their purpose was far from what headphones are used for today, and it was only related to the telephone industry. The first headphones were only used by telephone operators, and they were large and heavy, weighing more than ten pounds per earpiece. 1890sSurprisingly, not everyone wants to hear our music. When we were pumping our LCD Soundsystem mixtape, others in the office said they couldn’t “concentrate” and they “wished we were fired.” For this, and for many other reasons, headphones are an absolute necessity in our daily lives. It was long before Steve Jobs produced white earbuds and Dr. Dre jumped in the game, however, that people began getting tunes pumped into their ear canal. Here’s basically how it all went down. Just like what happened in the ‘80s with the emergence of the Walkman, the rise of the iPod and mp3 players led to a huge growth in the market for cheap, lightweight earbuds that has largely continued until today. 2004: Bluetooth Revolution Bluetooth logo (From: bluetooth.com) The first Koss headphones were based on Baldwin’s design only with bigger cups and improved sound quality and audio technology. Koss kept Baldwin’s thin headband but added padding to the cups for better fit and comfort. This model was to be improved in the years to come and develop hi-tech looks, noise isolation, wider headbands, etc. d B ( S P L ) / V = d B ( S P L ) / m W − 10 ⋅ log 10 ⁡ I m p e d a n c e 1000 {\displaystyle \mathrm {dB(SPL)} /\mathrm {V} =\mathrm {dB(SPL)} /\mathrm {mW} -10\cdot \log _{10}{\frac {\mathrm {Impedance} }{1000}}}

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Lichenstein, R; Smith, DC; Ambrose, JL; Moody, LA (October 2012). "Headphone use and pedestrian injury and death in the United States: 2004-2011". Injury Prevention. 18 (5): 287–90. doi: 10.1136/injuryprev-2011-040161. PMID 22248915. S2CID 25177965.Headphones are available with high or low impedance (typically measured at 1kHz). Low-impedance headphones are in the range 16 to 32ohms and high-impedance headphones are about 100-600ohms. As the impedance of a pair of headphones increases, more voltage (at a given current) is required to drive it, and the loudness of the headphones for a given voltage decreases. In recent years, impedance of newer headphones has generally decreased to accommodate lower voltages available on battery powered CMOS-based portable electronics. This has resulted in headphones that can be more efficiently driven by battery-powered electronics. Consequently, newer amplifiers are based on designs with relatively low output impedance. Users would use specialized headphones connected to their telephone lines to listen to the programs. It’s like Spotify, but for opera! Lightspeed Aviation 30 3G Discontinued Aviation Headset". lightspeedaviation.com . Retrieved 26 Dec 2020. Find sources: "Headphones"– news · newspapers · books · scholar · JSTOR ( April 2017) ( Learn how and when to remove this template message)