The AKG K 872 is a professional closed-back reference headphones designed for audio engineers and critical listening applications. It features a wide frequency response from 5 Hz to 54 kHz, providing accurate and detailed sound reproduction. The headphones have a closed-back design to provide excellent isolation and minimize sound leakage. They use large 53 mm transducers for extended low-frequency response and spacious soundstage. The K 872 are built with high-quality materials to ensure durability and comfort during long listening sessions. They come with a detachable cable for easy replacement or customization. Overall, the AKG K 872 is designed to provide precise and reliable audio monitoring for professional users.