Just tried this one for fun. These are Sennheiser HD25-1 II velour pads on my Porta Pro's. The opening in the back of the Senn pads fits very nearly exactly around the foam pads of the Porta Pro. They won't stay on without some help, so in this little experiment, I used double stick tape.
Koss Porta Pro Utility On-Ear Headphones, Detachable Interchangeable Cord System, Collapsible Design, Stealth Grey 4.0 out of 5 stars 143 1 offer from $49.99
The acclaimed Koss Porta Pro® has set performance and comfort standards for personal listening worldwide. Designed for those with refined musical taste, the Porta Pro® continues to be one of the most popular headphones around the world. $49.99.
UR21v Ear Cushion. $5.00. Includes three pairs of Porta Pro® replacement ear cushions and three pairs of temple pads.
Headphones sharing this same driver include the Porta Pro, Sporta Pro, KPH30i, and the KSC35. Koss uses a titanium-coated version in the UR40 , KTXPro1 , and KSC75 . Besides a few colorway changes, the current Porta Pro model remains almost entirely unchanged from the original.
A MODERN UPDATE ON A KOSS CLASSIC – Koss rocked the music world in 1984 with the Porta Pro headphones Now over three decades later we’ve brought this classic back with modern updates LIGHTWEIGHT & LOCKABLE – Part of what made the original Koss Porta so popular was its portable locking design We kept that design in the Porta Pro X to help
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    • koss porta pro headphones review