Professional Drivers The 40mm drivers deliver high sensitivity for a powerful output, plus an extended frequency response that reveals every detail. The K72s also feature a low-impedance design for compatibility with a broad range of playback devices, from professional studio gear to portable music players Closed-Back Design The K72 headphones' closed-back design eliminates audio leakage and delivers sound to your ears only. A microphone won't pick up the sound of the click track in your headphones - and you'll always be able to mix peacefully without being distracted by outside noise Comfortable Listening The self-adjusting headband automatically creates the perfect fit for every band member. No need to mess with delicate sizing mechanisms, which have the potential to break over time. Breathable, lightweight earpads encircle your ears, rather than putting pressure on them. And a single-sided cable gives you freedom to move Professional Build Quality Replaceable earpads are usually the first components to wear, so to protect your investment over time these earpads are replaceable - Akg K92 Closed-Back Studio Headphones