The HD681 series headphones offer 3 distinctive sound profiles, each with its own character: The HD681 features an exceptionally deep low frequency, the HD681F has a flat extended frequency response, and the HD681B has an excellent balanced character, and powerful bass punch. As for the sound image presented by these headphones, the HD681 gives you the feeling of actually being on stage with the artists while the HD681F makes you feel as if you sitting on the front row and the HD681B puts you in the middle of the concert hall, enjoying a deep, rich sound. These three headphones also deliver excellent balance and clarity. The ergonomically-designed vinyl ear pieces combined with the lightweight and self-adjusting headband of these headphones make them very comfortable. Whether you’re monitoring, tracking, mixing, or just listening to an MP3 or other audio source, you can expect comfort and sonic accuracy from your HD681 series headphones.