Open-back headphones with planar magnetic drivers that deliver astonishingly clear and accurate sound. and neodymum magnets. The frequency response is 10Hz – 50kHzmaximum power is at 15W with the impedance of 30 ohms and the max. SPL is 130dB. The headphones are made of space-age materials in a near weightless diaphragm that’s three times larger than typical headphones for fast response times, dramatically reduced distortion, higher resolution and improved imaging. Patented Uniforce voice-coil technology delivers a uniform driving force across the entire diaphragm for near zero distortion. Patented Fazor Elements guide internal headphone soundwaves to avoid resonance producing a more accurate waveform. The weight is 460 g.