The four types of headphones used. (a) fully open headphones, Koss
![](https://global.discourse-cdn.com/business6/uploads/headphones/original/3X/7/e/7e58b6ae6e95dfcfae5a8c436004f0f9fb474ad7.jpeg)
Koss Kph40 - General Headphone Discussion - The HEADPHONE Community
![](https://i.ebayimg.com/images/g/2y4AAOSwDgpk5UEn/s-l1600.jpg)
Vintage KOSS K/6A Audio Stereo Adjustable HEADPHONES-1/4 Jack
![](https://koss.com/cdn/shop/files/TWS250i_8acd31c6-f914-4c3c-a218-1286b90611d0_300x300.jpg?v=1692219320)
Koss Stereophones
The Best Open-Back Headphones of 2023 — Audiophile ON
![](https://massdrop-s3.imgix.net/product-images/drop-koss-kph40x-utility/FP/oqBIIpqoQxKHpBMKvSVO_KPH40X_0123-copy-pc.png?bg=f0f0f0)
Drop + Koss KPH40X Utility Headphones, Audiophile, Headphones
![](https://cdn.vox-cdn.com/thumbor/-DN4OTuGVUIIYK8eWjkGpCE8wwQ=/0x0:2040x1360/2400x1356/filters:focal(988x760:989x761)/cdn.vox-cdn.com/uploads/chorus_asset/file/10753783/akrales_180430_2518_0008.jpg)
Koss Porta Pro Wireless review: a classic mistake - The Verge
![](https://cdn.mos.cms.futurecdn.net/Hnom3Gp34KZtHWr8akHh7J-1200-80.jpg)
An ode to open-back headphones – and why I'd never go (closed-)back
The ultimate retro headphones created by Retrospekt and Koss, feature an adjustable and flexible metal band and state-of-the-art Koss sound drivers wrapped in the perfect shade of orange foam. Primed for acoustical and visual delight, you no longer have to choose between high-quality sound reproduction and classic styling. Powered by Koss technology, these stereophones offer state-of-the-art sound reproduction and intensity for unmatched sonic richness.
![](https://retrospekt.com/cdn/shop/products/Koss-Retrospekt_3.jpg?v=1657289079&width=3000)
Koss x Retrospekt P/21 Retro Orange Foam On-Ear Headphones
![](http://retrospekt.com/cdn/shop/products/Koss-Retrospekt_1.jpg?v=1645137792&width=2048)
Koss x Retrospekt P/21 Retro Orange Foam On-Ear Headphones