High-Fidelity Audio
Experience exceptional noise isolation and high-fidelity audio in a wide array of colors.
10-20,000 Hz
The Sound of Koss
Dynamic elements and acoustical vents combine to deliver a superior audio experience.
Passive Noise Isolation
The Plug reduces unwanted ambient noise so you can enjoy your music without distractions.
An Expressive Audio Experience
Express your unique style with a wide array of color choices.
Superior Design, Inside and Out.
Built inside and out to deliver an exceptional audio experience, all in an elegant in-ear design.
Memory Foam Cushions
The Plug comes with two sizes of soft memory foam cushions that mold to the inside shape of the ear, blocking out unwanted ambient noise.
Dynamic Elements
Dynamic elements and acoustical vents combine to deliver superior sound quality from 10-20,000 hz producing deep bass and crisp highs.
Sleek Design
Premium memory foam cushions with color matched accents and an anti-fingerprint matte finish give The Plug a sleek, sophisticated design.
3.5mm Headphone Plug
Connect to all of your devices with a convenient 4ft. (1.2m) 3.5mm standard headphone jack connector.
Many Colors. One Magical Listening Experience.
Big Sound
The Plug may be small in size, but it delivers BIG sound with clear and balanced audio across a frequency range of 10-20,000 Hz, which means you can expect deep base, crisp highs and an exceptional midrange.
Superior Noise Isolation
Many in-ear headphones aim to provide passive noise isolation, but The Plug has been designed from the ground to reduce ambient noise. It's memory foam cushions mold to the inside shape of the ear blocking out unwanted ambient noise for an immersive listening experience.
Hearing is Believing
Plug in Colors
The Plug delivers the kind of accurate acoustical reproduction and isolation typically found in high-end, closed-style high fidelity headphones. Dynamic elements and acoustical vents combine to deliver an exceptional audio experience all while reducing unwanted ambient noise due to it's memory foam cushions and superior noise isolating design.
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
Standard & Oversized Cushions
Porta Pro Collection
Retro Headphones
Utility Series
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.
High-Fidelity Audio
Experience exceptional noise isolation and high-fidelity audio in a wide array of colors.
10-20,000 Hz
The Sound of Koss
Dynamic elements and acoustical vents combine to deliver a superior audio experience.
Passive Noise Isolation
The Plug reduces unwanted ambient noise so you can enjoy your music without distractions.
An Expressive Audio Experience
Express your unique style with a wide array of color choices.
Superior Design, Inside and Out.
Built inside and out to deliver an exceptional audio experience, all in an elegant in-ear design.
Memory Foam Cushions
The Plug comes with two sizes of soft memory foam cushions that mold to the inside shape of the ear, blocking out unwanted ambient noise.
Dynamic Elements
Dynamic elements and acoustical vents combine to deliver superior sound quality from 10-20,000 hz producing deep bass and crisp highs.
Sleek Design
Premium memory foam cushions with color matched accents and an anti-fingerprint matte finish give The Plug a sleek, sophisticated design.
3.5mm Headphone Plug
Connect to all of your devices with a convenient 4ft. (1.2m) 3.5mm standard headphone jack connector.
Many Colors. One Magical Listening Experience.
Big Sound
The Plug may be small in size, but it delivers BIG sound with clear and balanced audio across a frequency range of 10-20,000 Hz, which means you can expect deep base, crisp highs and an exceptional midrange.
Superior Noise Isolation
Many in-ear headphones aim to provide passive noise isolation, but The Plug has been designed from the ground to reduce ambient noise. It's memory foam cushions mold to the inside shape of the ear blocking out unwanted ambient noise for an immersive listening experience.
Hearing is Believing
Plug in Colors
The Plug delivers the kind of accurate acoustical reproduction and isolation typically found in high-end, closed-style high fidelity headphones. Dynamic elements and acoustical vents combine to deliver an exceptional audio experience all while reducing unwanted ambient noise due to it's memory foam cushions and superior noise isolating design.
Acoustical Vents
Dynamic elements and acoustical vents combine to deliver superior sound quality from 10-20,000 hz producing deep bass and crisp highs.
Memory Foam Cushions
The Plug comes with two sizes of soft memory foam cushions that mold to the inside shape of your ear, blocking out unwanted ambient noise.
3.5mm Connector
Connect to all of your devices with a convenient 4ft. (1.2m) 3.5mm standard headphone jack connector.
Design
Premium memory foam cushions with color matched accents and an anti-fingerprint matte finish give The Plug a sleek, sophisticated design.
Rugged Cord
The rugged flexible 4ft. cord ensures the only thing you need to worry about is listening to your favorite music.
| Frequency Response | 10-20,000 Hz |
|---|---|
| Impedance | 16 Ohms |
| SPL | 112 dB |
| Cushions | Memory Foam |
| Cord | 4 ft (1.2 m) |
| Connector | 3.5mm standard headphone jack |
| Element | Koss Dynamic |
| Included | The Plug, L & M memory foam cushions |
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
Standard & Oversized Cushions
Porta Pro Collection
Retro Headphones
Utility Series
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.
