The first time you pull a driver off it’s gonna take more pressure than you’d think. Just pull apart evenly so you don’t bend or break and plastic. Here’s a video to help illustrate. The PortaPro, KSC75 and KPH40 all use the same connecting mechanism. Just get your fingers under there and pry. The wired and Bluetooth Porta Pro headphones look the same, except for the wired bits; the normal 'Pro has skinnier wires. The 4.1, aptX Bluetooth model's wires are slightly thicker and have an just bought my first Koss Porta Pro. Try Yaxi pads on them and if you can, have the cable modded. I got mine modded to MMCX and bought a tougher cable. Now I can use my KPPs without worrying too much about the cables breaking when they get snagged on to somethig. All right, thx. It supports aptX Adaptive and Bluetooth multipoint. Grado Labs SR60x ($99 at Amazon): The Grado Labs SR60x is the entry-level option in the company’s lineup, and it’s got a lot going for it. Koss Porta Pro ($59 at Amazon): Talk about timeless; the Koss Porta Pro has maintained the same look since 1984. This reliable set of semi-open cans is "Koss Porta Pro stereophones high quality sound sets a sound performance standard for portable listening. First introduced in 1984, this high quality portable stereophone set performance and comfort standards for personal listening worldwide. Koss has preserved the original design and performance that made the Porta Pro a portable music icon. Designed for those with refined musical acuity, the LinksKoss Porta Pro - Koss has finally created a Bluetooth version of its iconic value headphone. But the design is a head-scratcher. The new Koss Porta Pro Wireless retails for $80. Koss' Porta Pro has been around for h5jb.