KOSS Corporation

Koss Porta Pro headphones

The Koss Corporation is an American company with headquarters in Milwaukee (Wisconsin). The main business area of the company is the development and production of headphones , which are sold under the brand name KOSS . The company is listed on the NASDAQ .

History of the company

The company was founded in 1953 by John C. Koss as a television rental company. Five years later, together with his partner Martin Lange, he developed the world's first stereo headphones, the SP / 3 . The K 2 + 2 model was introduced in 1971. These are the first headphones with quadrophony . The Porta Pro model , which was first presented in 1984 and has been built almost unchanged since then, developed into a cult object . In 1991 Michael J. Koss, the founder's son, took over the management.

Web links

www.koss.com Company website (English)
www.in-akustik.de Website of the German importer

Individual evidence

^ Koss Corporation stock price & data summary. NASDAQ website.
^ History of Koss. Koss website.
↑ Koss Porta Pro. Headphone test on computerbild.de , February 7, 2011.
↑ Important milestones in the history of Koss, the inventor of the stereo headphones. Website of the German importer ( Memento from April 6, 2016 in the Internet Archive ).

[1] Koss Corporation stock price & data summary. NASDAQ website.

[2] History of Koss. Koss website.

[3] Koss Porta Pro. Headphone test on computerbild.de , February 7, 2011.

[4] Important milestones in the history of Koss, the inventor of the stereo headphones. Website of the German importer ( Memento from April 6, 2016 in the Internet Archive ).