Koss
Headphones
Website
Best Known For
Headphones
/
Used Products
1
 Available
Average Price
$500
Brand Popularity
595
 of 900+
Products Listed
8
Review Count
27
Founding Year
1953
Headquarters
United States
Koss
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What's unique about the brand

Koss invented the world's first stereo headphones in 1958 (the SP/3, now in the Smithsonian), effectively creating personal listening, and has continued pioneering firsts including the first self-energizing electrostatic headphone (ESP/6, 1968) and the first dynamic headphone to reproduce all 10 audible octaves (HV/1A, 1974). The brand offers unusually broad limited lifetime warranty coverage on many models and created the modular Utility Series (2021) with detachable cords that let the same headphones work with future devices through different cable connections.

What reviewers are saying

We read all the reviews. Here's what reviewers feel most strongly about:

  • Koss is known for electrostatic headphones and complete systems, including dedicated energizer/amplifiers, at a comparatively affordable price.
  • The brand balances the retro aesthetic of classic designs with modern features such as wireless connectivity and detachable cables.
  • The brand fosters a community around its products, evident in collaborations with companies such as Drop, and is receptive to community feedback in design and development.

Our favorite reviewer quotes:

  • "The midrange is characterized by an arresting sense of fidelity. It doesn't matter what you are listening to, when you hear these mids, you'll know: this is the way music should sound." (https://majorhifi.com/koss-esp-950-review)
  • "It renders detail with incredible authority and it's equally perfect for enjoying a good album, movie, or game, or checking for flaws in a recording during a professional mixing session. You will truly have the "I'm hearing things I've never heard before" audiophile experience." (https://xander51.medium.com/koss-pro4s-studio-headphones-review-3f3dfb76593e)
Want to report a correction? Please contact us. We'd love to hear from you. Note that much of the data, recommendations, and summaries on ExtremeHiFi are researched after thousands of hours of loving labor. We archive our site's data and its pages on Archive.org and monitor for those repurposing the data. We also fingerprint data to know when text and numbers came from us.

Our interview with the brand

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From Julian's interview with
.

Lineup comparison

We think it's helpful to understand how their products compare. To learn more about each, scroll to the section above to click through to individual product pages.

Porta Pro

  • Positioning: The entry-level design focused on portability and everyday use.
  • Description: Features updated aesthetics with inline controls and a comfortable build that suit small-room or on-the-go listening. Compared to the mid-range and electrostatic models, it offers a simpler sound signature and basic functionality without high-end tuning.

PRO/4AA

  • Positioning: A mid-range option aimed at users looking for robust, everyday performance.
  • Description: Delivers clear sound and reliable build quality that make it suitable for studio work and extended listening sessions. When compared to the entry-level Porta Pro and more premium electrostatic products, it provides improved audio clarity and durability with a modest step up in cost.

QZ99

  • Positioning: A balanced mid-range model designed for everyday versatility.
  • Description: Introduces modern design elements and enhanced comfort to fit both home and travel use with stable sound performance. In comparison to the PRO/4AA and Porta Pro, it emphasizes design refinement and user experience, though it does not offer the advanced technology of the electrostatic series.

ESP950

  • Positioning: A high-end electrostatic system aimed at detailed and precise sound reproduction.
  • Description: Uses electrostatic driver technology to deliver clear, crisp audio with a spacious soundstage suitable for controlled listening environments. Compared to non-electrostatic models like the QZ99 and PRO/4AA, it stands out with higher sonic precision while remaining a step below the flagship model in overall refinement.

ESP95X-plus

  • Positioning: The flagship model featuring premium electrostatic technology and superior build quality.
  • Description: Refines electrostatic design with enhanced tuning and high-quality materials for exceptional clarity and performance. When contrasted with the ESP950 and other lower-tier models, it offers the most advanced features and detailed sound response.
Website author headshot
Julian Shapiro
ExtremeHiFi Writer

Used

Koss

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What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

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Julian Shapiro
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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page
Known For
Headphones
/
Average Price
$500
Used Products
1
 Available
Brand Popularity
239
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Headquarters
United States

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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page
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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page
Known For
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Average Price
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Used Products
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Brand Popularity
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Headquarters
United States

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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page