Review: The iconic Koss Porta Pro headphones have a new Bluetooth version Koss debuted the Porta Pro headphones in 1984 and still makes them today. But the company just released a wireless version of the iconic headphones that keeps the same aesthetics and audio profile while letting people cut the headphone cord. K oss is an icon in the headphone industry, and deservedly so! I’ve loved basically every Koss product I’ve ever used, from the classic Porta Pro to the stunningly neutral KPH30i to the surprisingly comfy and cheap UR20. The company has a long history of making excellent and important audio gear. 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. WB5Ck.