Is Koss Made in USA?
Last verified: April 2026 · Based on 4 verified products and public manufacturing evidence
Partially — Some Products Made in USA
Koss's core product lines are made in the USA in Milwaukee, WI, but the brand has known exceptions where some products are manufactured overseas. Look for explicit "Made in USA" labeling on individual items.
Verification Confidence
Average confidence score across 4 verified products — scores ≥70% are shown on this site.
Manufacturing Details
- Made in
- Milwaukee, WI
- Headquarters
- Milwaukee, WI
- Location detail
- Specific city confirmed
- History
- Long-established (50+ years)
- Founded
- 1958
- Note
- Some product lines manufactured overseas
Verification Evidence
Koss Corporation manufactures its high-end electrostatic headphones (ESP-950 and ESP-95X Plus) by hand at Koss World Headquarters in Milwaukee, Wisconsin. Founded 1958 by John C. Koss, credited with inventing the modern stereo headphone. Flagship ESP models are hand-assembled in Milwaukee. Mass-market models (Porta Pro, KPH40) assembled domestically but use some imported components. All headphones sold in North America carry lifetime warranty since 1989.
About Koss
Koss Corporation invented the modern stereo headphone in 1958 and has assembled its flagship electrostatic models by hand at its Milwaukee, Wisconsin headquarters ever since, earning a permanent place in the audio equipment hall of fame.
The Invention of the Stereo Headphone
John C. Koss founded Koss Corporation in Milwaukee, Wisconsin in 1958, and within months introduced the SP-3 stereophone — the world's first pair of stereo headphones. Before that moment, headphones existed as telephone and radio monitoring tools, not as consumer audio devices. Koss changed the category entirely, giving listeners a way to experience recorded music with the spatial separation that stereo recordings were designed to deliver.
The technology that made it possible was Koss's Temporal Pressure Gradient driver design, which uses the interaction between the ear and the air pressure around a dynamic driver to produce a wider soundstage than conventional headphone designs. That same underlying principle drives the Porta Pro, the collapsible on-ear model that has been in continuous production since 1984 and remains one of the most-recommended headphones in any price category.
Electrostatics Made in Milwaukee
Koss's most technically ambitious products are its electrostatic headphones, the ESP-950 and ESP-95X Plus, both hand-assembled at Koss World Headquarters in Milwaukee. Electrostatic drivers use a thin charged membrane suspended between two conductive stators rather than a conventional voice coil and magnet. The result is a diaphragm so light that it can follow extremely fast transients — the attack and decay of notes — with accuracy that dynamic drivers can only approximate.
The ESP-95X Plus uses an advanced diaphragm coating and damping materials refined over decades of electrostatic development. It achieves a frequency response from 8 Hz to 35,000 Hz — well beyond the range of human hearing at both ends, but relevant to the accuracy of in-band reproduction. Each pair is assembled by hand in Milwaukee, a process that reflects the precision required to match two electrostatic panels to each other within specification.
American-Made Koss Products
Frequently Asked Questions
Is Koss made in the USA?
Koss is partially made in the United States. Core product lines are American-made in Milwaukee, WI, but some products have known exceptions. Koss Corporation manufactures its high-end electrostatic headphones (ESP-950 and ESP-95X Plus) by hand at Koss World Headquarters in Milwaukee, Wisconsin. Founded 1958 by John C. Koss, credited with inventing the modern stereo headphone. Flagship ESP models are hand-assembled in Milwaukee. Mass-market models (Porta Pro, KPH40) assembled domestically but use some imported components. All headphones sold in North America carry lifetime warranty since 1989.
Where is Koss manufactured?
Koss manufactures its products in Milwaukee, WI. The company is headquartered in Milwaukee, WI.
Which Koss products are made in the USA?
We carry 4 verified American-made Koss products across Electronics. Every listing is linked directly to Amazon with verified manufacturing evidence.
Are all Koss products made in the USA?
Not all Koss products are made in the USA. The brand has known product lines or SKUs manufactured outside the United States. Look for explicit "Made in USA" labeling on individual products, or browse our verified Koss products which have all passed our verification threshold.