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The QZ/900 is the latest addition to the Koss Quiet Zone line and adds a new level of performance and comfort. The electronics package inside each Koss QZ/900 is designed to monitor outside noise received through specifically mounted microphones in each ear cup. Once this incoming noise can be analyzed, the Koss QZ/900 circuit introduces a sound wave which is 180 degrees out of phase with the incoming signal. The result is what engineer's term zero earth at the point of the eardrum. This means that most low frequency distractions from an airplane, lawn mower, fan, or even the din of an office can de dramatically reduced. Once the QZ/900 reduces the outside noise, the Sound of Koss takes center stage. Deep rich lows and sparkling highs in a stereophone you'll want to take along everywhere. In fact the noise cancelling ability is so good in the new QZ/900 that you'll find less need to turn up the volume and overdrive the tiny amplifier in your portable electronics. This means greater efficiency, less distortion and all the excitement of a live performance. The QZ/900 operates with or without its active noise cancelling circuit engaged. A handy removable cord features an in line volume control and one standard AAA battery provides approximately 50 hours of active noise cancellation.
Additional Details
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