Powerful 53mm transducers enable highest in-class headroom Sophisticated open-back technology reduces reflections for accurate imaging and natural sound 1.5 Tesla Magnet System provides the most accurate and powerful experience possible Ultra-lightweight two-layer voice coil for superior impulse response and extended frequency range up to 54 kHz THE NEW HEADPHONE FLAGSHIPThe AKG K812 Superior Reference Headphones carry 53mm transducers - the largest AKG has ever used. With the 1.5 Tesla Magnet System and an ultra-lightweight two-layer voice coil, these headphones deliver an accurate imaging and pure, natural sound. The K812 was also designed for long mixing or listening sessions: An open mesh headband and 3D-shaped slow retention ear pads ensure maximum comfort that will let you forget that you have the K812 on your head.