Acoustically Invisible Stealth Magnets The advanced magnet design featured in the SUNDARA Closed-back is acoustically transparent, dramatically reducing wave diffraction turbulence that typically degrades the integrity of the sound waves. The result is reduced distortion, yielding a purer, more harmonious sound that is demonstrably better than previous designs. Unlike the sound waves that are created by conventional magnets, the unique shape of stealth magnets enables sound waves to pass through the magnet without generating interference. The same happens in conventional electrostatic headphones, where the stator's interference causes sound quality degradation. A conventional dynamic driver's frequency response can be altered due to distortions and vibrations across the diaphragm surface. The degradation of sound quality in conventional planar magnetic headphones is caused by the magnets getting in the way of the sound wave. NEO Supernano Diaphragm HIFIMAN devoted extensive time and resources to creating a nano-scale thickness diaphragm that allows for a lightning-fast response that not only produces stunning levels of detail but ultra-low distortion too. SUNDARA Closed-back offers performance levels and musical purity that exceed expectations, especially for such affordable headphones.   Acoustic Structure Specialized for Closed-back Design Huge soundstage is offered by the open planar headphones The Natural Beauty of Elegant Beechwood Ear Cups Hand-assembled wood grain ear cups offer the dual benefits of exceptional sonics and stylish good looks. Mainstream Cable Connections A detachable dual-sided 3.5mm cable is packaged with a 6.35mm for compatibility with a wide range of devices.   Sundara Closed-Back headphone Dual-side 3.5mm plug headphone cable (1.5m) x 1 6.35mm Adapter x 1 Ear pad (installed on the headset) x 1 pair