With the HD 660 S, Sennheiser has renewed a classic. Thanks to the newly developed drivers, these headphones react better than its predecessor. The headphones sound detailed, thanks to the wide frequency range of 10 to 41,000 Hertz. This ensures that the HD 660 S is suitable for the most demanding listener, because the treble and bass are clearly distinguishable from each other. The sound sounds spacious, thanks to the open design. This makes the headphones especially suitable for home use. Thanks to the comfortable ear cups, you can easily carry these Hi-Res headphones for a whole day without your ears burning.