Why are $50 dollar Koss Porta-Pros from the mid-1980s, still one of the best headphones today? - Quora
![Poyatu Headphone Speaker Parts For Koss Pp Portable Portapro Porta-pro Loudspeakers Headset Speaker Hifi Auriculares Speakers - Earphone Accessories - AliExpress Poyatu Headphone Speaker Parts For Koss Pp Portable Portapro Porta-pro Loudspeakers Headset Speaker Hifi Auriculares Speakers - Earphone Accessories - AliExpress](https://ae01.alicdn.com/kf/S186f2b295e7147a39366ecb25c0a483cZ/POYATU-Headphone-Speaker-Parts-For-KOSS-PP-Portable-Portapro-Porta-Pro-Loudspeakers-Headset-Speaker-HIFI-Auriculares.jpg_Q90.jpg_.webp)
Poyatu Headphone Speaker Parts For Koss Pp Portable Portapro Porta-pro Loudspeakers Headset Speaker Hifi Auriculares Speakers - Earphone Accessories - AliExpress
![Amazon.com: Koss Porta Pro Wireless Bluetooth On-Ear Headphones, in-Line Microphone, Volume Control and Touch Remote, Adjustable Headband with Multi-Pivoting Ear Plates, Black : Electronics Amazon.com: Koss Porta Pro Wireless Bluetooth On-Ear Headphones, in-Line Microphone, Volume Control and Touch Remote, Adjustable Headband with Multi-Pivoting Ear Plates, Black : Electronics](https://m.media-amazon.com/images/I/51tVCmjpuhL.jpg)