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The Original American Stereophone Company

In 1958 John C. Koss changed the way we all listen to music when he invented the world’s first SP/3 stereophone.

Koss sought to replicate the excitement of a live musical performance, allowing listeners to experience sound as they had never before, bringing them closer to the music they love. Music lovers around the world recognize that dedication to accuracy in sound reproduction as: The Sound of Koss

Porta Pro Collection

Retro Headphones

Utility Series

Wireless Headphones

Best Sellers

Birth of the Stereophone

Before the world’s first SP/3 Stereophone in 1958, John C. Koss developed a portable stereo photograph player with side-wing speakers.

World’s First SP/3 Stereophone

in 1958 John C. Koss invented the world’s first SP/3 Stereophone introducing personal stereo audio to the world.

SP/3X

In 1960 Koss released the predecessor to the SP/3 with a lighter design, more comfortable headband and superior sound quality.

Pro/4AA

In 1970 Pro/4AA set the standard for full-size professional headphones delivering true full frequency performance.

Koss World Headquarters

On June 25, 1971 John C. Koss unveiled the new Koss World Headquarters in Milwaukee, Wisconsin.

HV/1A

In 1974, Koss released the HV/1A the first dynamic headphone capable of reproducing all 10 audible octaves.

Porta Pro

In 1984 the acclaimed Porta Pro was released and set performance and comfort standards worldwide for decades to come.

JCK/300 Kordless System

In 1989 the JCK/300 Kordless Headphone system set the standard for infrared wireless headphones.

ESP/950

In 1990 Koss’s revolutionary ESP/950 electrostatic headphones introduced breakthrough high-fidelity sound.

Pro4S Studio

Carrying on the legacy of the Pro/4 line, 2014’s Pro4S Studio Headphone was specifically designed for audio professionals.

KPH30i

In 2017 Koss released the acclaimed KPH30i featuring an ultra-light weight design with remarkable high-fidelity sound.

Utility Series

In 2021 Koss Utility Series introduced three new headphones allowing listeners to connect via Lightning, USB-C and 3.5mm.

True Wireless Earbuds

In 2023 Koss continued it’s evolution of wireless headphones with the TWS250i True Wireless Earbuds.

Frequency Response – 15-25,000 Hz and Impedance – 16 ohms