Introduced at CES 2009, the HD 800 are a high end, dynamic, audiophile quality headphone from Sennheiser. An update to the popular HD 600 and HD 650 models, the HD 800 features the same open, circumaural design in an updated body which is aesthetically much more modern. Featuring the largest driver of any dynamically driven headphone to date - allowing for improved low frequency response, the HD 800 includes technology that allows it to overcome any potential resonances created by such large drivers in the highs. With tilted drivers that allow sound to be directed at the ear at a 45 degree angle, Sennheiser claims that the HD 800 present a truer listening experience when it comes to spatial extension.