SENNHEISER HD 700 are awesome Over Ear Headphones which offer high-quality finish with open-back ear cup design. The ultra comfortable and luxurious earpads with its silicone-treated headband ensures extraordinary wearing comfort. The headphones sports specially-tuned and highly efficient drivers capable of delivering great sound even at high sound pressure levels while its highly optimized ventilated magnet system minimizes air turbulence and harmonic distortion. HD 700 comes with innovative and highly aesthetic dual-material yoke for better stability and eliminates negative influences to sound quality. Other specs of SENNHEISER HD 700 are frequency response range 15Hz-40KHz , 105dB sound pressure level, 6.3mm stereo plug, 3m symmetrical, silver-plated oxygen-free (OFC) copper cable , 270g weight (w/o cable) and 150 ohm impedance.