This is a work of art that is not only beautiful to look at, but also to listen to. The closed-back version features HiFiMan's proprietary Stealth Magnet driver for the usual outstanding, fast and accurate sound reproduction, this time from 6Hz to 50000Hz. Beyond the human hearing range and beyond all expectations of quality. Carefully assembled with interchangeable cables and stylishly crafted from matte black metal and beech wood, these planar (magnetic) headphones are not only comfortable, but just the right weight to deliver a highly detailed and lifelike listening experience anywhere. SUNDARA means "beautiful" in Sanskrit.