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I really like the headphones, found the sound excellent, butThey are a bit uncomfortable as the ear pads sit on top of your ears and the pressure gets uncomfortable after awhile. Not only are they comfortable, but the sound is so much better.
Voarmaks Great Size Over Ear Pads Compatible with Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Replacement Foam Pad Covers (Large Size On Ear Pads) : Electronics
Koss KPH40 mmcx and semi open back mod. : r/headphones
Voarmaks Great Size Over Ear Pads Compatible with Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Replacement Foam Pad Covers (Large Size On Ear Pads) : Electronics
Found this suprisingly kind of promising looking headband mod on aliexpress For KOSS Porta Pro, KSC35, KSC75, KSC55 : r/headphones
Koss Portapro Thread Headphone Reviews and Discussion
Buy Koss Foam Ksc75 devices online
Great Size Over Ear Pads For Koss Portapro Porta Pro Ksc75 Kph40 Kph30i Headphone Headset Earpad Sponge Cushion Foam Pad Covers
Headband Head Pad Top Cushion For KOSS Porta Pro PP KSC35 KSC75 KSC55 Headphones
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Premium Custom Made Large Foam Ear Pads Cushion For Koss Porta Pro PortaPro PP Headphone EarPads Spongs - AliExpress