The Beyerdynamic DJX-1 is a professional, closed-back DJ headphone with a large 50mm transducer, a Mono/Stereo switch, and extended frequency reproduction, featuring LF response down to a true 5 Hz. These headphones offer maximum isolation, comfortable padded earcushions, and a totally flexible design with swiveling earcups, folding down to half the working size, for convenient transportation in the supplied custom carrying case.