We have reviewed 5 Koss headphones. They make mid-range and affordable headphones primarily for critical listening, but they also have a few mixed usage models at higher price ranges.
Overall, Koss makes affordable headphones that sound great. They also have a wide variety of headphone types and designs that cover most listeners' preferences. However, they're not the best built or the most durable headphones. They also lack in features when compared to other brands who offer similarly priced models.
The best Koss headphones for critical listening that we've tested so far are the Porta Pro. They're above-average critical listening on-ear headphones that are portable and comfortable enough for mixed usage, although they won't be the most versatile headphones for all environments. They do not block a lot of noise, and leak a lot due to the open design, but on the upside, they deliver a sound quality that's on par with headphones twice or three times their price range.
The Porta Pro Wireless are the best Koss headphones we've tested for mixed usage, although they will not be ideal for all environments. They have the same great sound of the wired version, but are a bit more convenient to use on a daily basis thanks to their wireless connectivity and range. Unfortunately, unlike most wireless on-ears and over-ears, they do not have a 1/8 TRS audio jack, so you can't use them wired/passively when the battery dies. They are also quite a bit more expensive than the wired variant, which may not be worth it for some.
Koss makes a wide variety of headphone types and designs primarily for critical listening, but they also have more versatile models for everyday use. They have a lot of budget options that outperform much pricier headphones when it comes to sound quality. However, they don't have the most durable designs, and compared to some other brands like Bluedio, they lack a lot of features, even at their relatively affordable price range.
Check our recommendations for the best on-ear headphones.