When Koss developed its first Quiet Zone Active Noise Canceling Stereophone in 1993 it literally broke the sound barrier. Today, music lovers recall the QZ1000, QZ2000, and QZPro models for their breathtaking performance and their ability to wipe away distracting outside noise. 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 specially 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° 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, congested traffic, or even the din of an office can be 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 canceling 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 canceling circuit engaged. A handy removable cord features an on line volume control

The new Koss CC_01 isolating in-ear monitor is the first stereophone to create a perfect fit with a unique Custom Fit dial. Rotate the crafted knurled knob and the ear cushion expands to provide a custom fit. Koss in-ear monitors are designed to produce a perfect seal. This seal allows the variable matched transducer to directly couple with the eardrum. This direct response system means greater accuracy and efficiency across the entire frequency response range. No other in-ear monitor provides the ability to dial in comfort or performance. Its an entirely new state of the art in ergonomic and acoustic design. The transducer in the CC_01 features a custom ported design to enhance frequency response and deliver deep bass frequency. The transducer is specially cross-matched for balance across the entire musical spectrum. The result is an up-front, exacting performance with instruments retaining their size and scale on the musical landscape. The specially padded cloth covered cord serves as a wrap around portable digital music players. And when protection is especially desired the CC_01 comes with two separate carrying cases; soft leather for your pocket or pack and a hard travel case for travel.