I really like the very small PORTAPRO for my high back lounge chair. I was using the PHILIPS 895 but they hit the back of my chair when I move my head. I had the PORTAPRO drivers in my KOSS 75 clips but after a few hours they hurt my ears. I have a quarter size hole cut in both pads. When you give the PORTAPRO good amp power they really sound

The Koss Porta Pro has been a staple for the budget audiophile since 1984. The Sennheiser PX-100 models have been around since the early 2000s, and the 100-II version was discontinued in 2019. All the above models have in common that their drivers are covered with black foam ear pads, roughly of the same size.

Sure the PP drivers being a bit more powerful, I bet these drink the battery slightly faster. After getting them to work technically, it was time to attach the drivers to the headphones. The benefit of Koss Porta Pro being so popular, there were multiple of files online that had the socket for the swivel/joint.

Koss Porta Pro Limited Edition Rhythm Beige On-Ear Headphones, in-Line Microphone, Volume Control and Touch Remote Control, Includes Hard Carrying Case, Wired with 3.5mm Plug, Rhythm Beige. $59.00. Buy On Amazon. Koss Porta Pro On Ear Headphones with Case, Black / Silver. $39.00.

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koss porta pro driver size