The sundara closed back headphone is highlighted by elegant, hand assembled beechwood ear cups that serve to isolate the listener from background noise and emphasize the natural bass response of the original recording'. '.strtoupper('d')esigned by hifiman engineers, the ear cups offer the dual benefits of exceptional sonics and stylish good looks'. '.strtoupper('a') recent hifiman creation, stealth magnet technology is an integral part of the headphones sonic output by significantly reducing reflections and diffractions that are detrimental to sound quality like the open back version, the new sundara closed back features hifiman ultra thin super nano diaphragm, which is up to 80% thinner than diaphragms in more common headphones'. '.strtoupper('t')he design results in an ultra wide frequency response 6hz 50khz with sonic detail that reveals the fine points in well recorded music.