The Koss Porta Pro are some of the most iconic headphones ever. Their retro aesthetic and open-backed design has survived the test of time, making them a popular entry-level recommendation for over 30 years. But in this age of disappearing headphone jacks, even the classics have to adapt. As spotted by Ars Technica, an FCC filing registered by Koss way back in December looks a whole lot like a Bluetooth version of the Porta Pro – not to mention a user manual refers to them specifically as the “Koss Porta Pro Wireless.” As far as we can tell, the headphones look nearly…
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