Utrasone PROline 550   (Discontinued by Manufacturer) S-Logic natural surround sound moves the sound out of the headphones and into the room around you for a spacious three dimensional sound Safer listening, less fatigue - pressure to the ear drum is decreased by up to 40% (3-4dB) for the same perceived loudness, significantly reducing the risk of hearing damage ULE technology with MU Metal shielding to reduce radiation by up to 98% compared to ordinary headphones Great bass response and superb isolation, exceptional for DJs, Bassists, Broadcasters