That"s why I have decided to join forces with AKG as they understand that giving the best possible sound reproduction is key to this experience." (TIËSTO) * The K167 TIËSTO"s 40mm driver allows solid bass foundation and higher sound pressure levels, while its roadworthy design provides maximum reliability -for high comfort and maximum noise rejection. * Are you looking for brilliance in sound? The broad frequency range of the K167 TIËSTO headphones guarantees clear sound and optimal delivery of your performance.