In 1958, John C. Koss teamed up with engineer Martin Lange, Jr. to develop a portable stereo phonograph player with side-wing speakers. The pair demonstrated their new stereo record player at a Wisconsin audio show. One of the product's unique features was a privacy switch, which allowed listeners to hear music by plugging in the world's first SP/3 Stereophone.
The stereophones were intended to be an accessory to demonstrate the high-fidelity stereo sound that the portable phonograph player delivered.
The revolutionary sound of the Koss SP/3 Stereophone became the hit of the show.
Koss were the inventors of the first Hi-Fidelity stereophonic, so you know you're guaranteed the best quality sound when buying one of their headphones.
Music lovers around the world recognize that dedication to accuracy in sound reproduction as The Sound of Koss.