Sennheiser HD 600 Open Audiophile Headphones - BlackThe HD 600 was developed to give audiophiles an impartial scale of everything before it in the audio chain. Purpose built to vanish when the listener presses play, the HD 600 is the benchmark reference headphone for both analyzing and enjoying your hi fi setup. This disappearing act starts with an innovative, systematic approach to sound reproduction using transparency as the driving principle. Leveraging Sennheisers progressive production techniques