Koss QZ900 Noise Cancellation Headphone (Black)

The QZ900, latest addition to the Koss Quiet Zone line - adds a new level of performance and comfort. Designed to monitor outside noise received through specially mounted microphones in each ear cup. Koss QZ900 circuit introduces a sound wave which is 180° out of phase with the incoming signal. The result is "zero earth" at the point of the eardrum and dramatic reduction of most low frequency distractions, resulting in deep rich lows and sparkling highs, noise canceling ability so good you'll need less volume for greater efficiency and less distortion from overdriving the tiny amplifier in your portable electronics. QZ900 operates with or without active noise canceling circuit engaged. Features a removable cord and an on line volume control and 1 standard AAA battery which provides approximately 50 hours of active noise cancellation.

Owner Reviews, Ratings, Comments and Criticism
I bought the Koss QZ900 headphones, after a lot of research, as a lower cost alternative to the Bose QC-2 headphones. I've had a chance to compare them to both the QC-2 and QC-3. No question, the Bose QC-2 (over the ear) headphones have the edge. However, I did not care for the QC-3 (on the ear) headphones. On a recent trip across the Atlantic, the airline I was on distributed the Bose QC-3 headphones for use during the flight. I tried the Bose QC-3s, put them up, and used my Koss QZ900 headphones instead. The Koss headphones sound nearly as good, and have nearly as good noise cancellation as the Bose QC-2. They are light, compact, use a AA battery, and have a volume control on the removable cord. The one negative about the product is that the carrying case is larger (thicker) than it has to be. If money is no object, go with the Bose QC-2s. If you can't justify the $270 for heaphones, the Koss QZ900s are a good choice.