(2) Bit more expensive but much easier MMCX mod: There's a person on eBay from the UK (tekki-uk) that sells custom designed 3D printed mod kits for a few different Koss models, including the Porta Pro. You can either get just the plastic bits that you use to replace the covers or get them with pre-soldered MMCX connectors.
Now at around $40 or more there seems to be better options for a portable headphone such as the $12 JVC HA-S160 or the $50 Sennheiser PX100II. I did buy the Portapro many years ago, but wouldn't buy one now. Koss even makes the Sportapro, which sounds virtually identical to the Portapro(I have both) but looks different and is around half the price.
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16. Likes. 0. Hi, I bought a set of new Koss Porta Pro headphones from someone on another forum about three month ago. i remember he said he bought it at future shop. I don't have the original receipt. I want to register it for the lifetime warranty on koss.com. In this picture, I fill in my name, address, phone, email, product (select Porta Pro) The Koss PortaPro / KSC75 could be endgame for a lot of you. It seems like this is both the most well known secret and best kept secret: The Koss PortaPro and KSC75 are easily the best value in his hobby. It seems like this advice is being taken for granted, so I kind of want to bolster the discussion and make sure that beginners in his hobby

They're amazing for on the go, but not the best otherwise. that's why porta pro. the Koss PortaPros are probably the best quality per dollar headphones. If all you've used before were standard apple buds or average store-bought headphones, they will sound amazing and take you to the next dimension of the sound-world.

On Ear Headphones. The acclaimed Porta Pro® Limited Edition is more than two new colorways, it features an inline microphone, remote and attenuating volume control. Included with the Porta Pro® Limited Edition is an all-new hard compact carrying case (standard pouch also included). $59.99.
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koss porta pro alternative reddit