Open-back Nady QH560 Deluxe Studio Headphones are equipped with advanced-design high-performance drivers and ultrathin 40mm diaphragms for outstanding sound reproduction. Nady QH560 headphones produce clear natural sound suitable for studio reference. Response is 20Hz to 20kHz. Nady QH560 Deluxe Studio Headphones" headband is self-adjusting for universal fit, and their earcups are cloth-covered for long-lasting comfort. Nady also includes a 1/4" adapter that fits over the QH560 headphones" 1/8" plug. Open back Ultrathin 40mm diaphragms 20Hz to 20kHz response Self-adjusting headband