General Information
QZPro Quiet Zone Portable Noise Cancelling Over Ear Headphones The Koss Quiet Zone QZ PRO stereophone delivers a winning combination of passive and active noise reduction (ANR) for music lovers who are looking for a little peace and quiet on the go. Designed with soft, vinyl closed cushions that create a seal around the ear, the QZ PRO creates a passive, mechanical seal that reduces ambient noise while retaining bass frequencies. Koss’s active noise reduction circuitry is built directly into the earcups using tiny microphones that sense surrounding low frequency. Information about the undesirable sound waves is processed through the circuitry and creates an "anti-wave." The sound wave and "anti-wave" counteract each other at the wearer’s ear, reducing the irritating low frequency noise and increasing listening pleasure. Designed to reduce low frequency, repetitive noise, the QZ PRO is most effective at blocking out noises you want to eliminate while not affecting things you want to hear- like voice and music. The QZ PRO affects those noises between 30Hz and 1400 Hz, allowing music and voice to come through loud and clear. No lightweight when it comes to sound reproduction, the QZ PRO utilizes a dynamic element for a full frequency response of 40-20,000 Hz. A deep bass and balanced midrange deliver an impressive sound performance whether you’re enjoying a DVD, CD or MP3 recording. An extra-soft, padded headband allows for lightweight comfort for extended listening periods. Completely collapsible, the QZ PRO makes an ideal travel companion on a plane, bus or automobile. No need for noise cancellation? No problem. And unlike some competitive models, you can enjoy the Sound of Koss with or without noise reduction. The QZ PRO noise reduction circuitry can be turned on and off with a flip of a switch. The QZ PRO operates on 2 "AAA" batteries and delivers approximately 30 hours of continuous play. Additional Features include a 4-foot, single entry, straight cord and a 2-prong airline adapter. To install the batteries: The QZ PRO does operate on batteries which are located in the right earcup. If you grasp the right ear cushion and turn counter clockwise, the ear cushion should twist off.The battery compartment is located inside. Built to last, the QZ PRO is covered under Koss’ Limited Lifetime Warranty - the only warranty of its kind in the stereophone industry. Specifications Frequency Response 40-20,000 Hz Impedance 32 ohms Sensitivity 90 dB SPL/1mW Distortion <0.2% Cord Straight, Single Entry, 4ft
