Koss QZ900 Noise Reduction Headphones

Item # SRSQZ900
| Mfg # QZ900ACTIVE
| UPC # 021299160077
Our Price: $249.99
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ONLY 8 IN STOCK
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QZ900 headphones are the latest addition to the Koss Quiet Zone line and add a new level of noise reduction, performance, and comfort. The electronics package inside each ear cup is designed to monitor outside noise received through specifically mounted microphones in each ear cup.  

Once this incoming noise can be analyzed, the Koss QZ900 circuit introduces a sound wave that is 180 degrees out of phase with the incoming signal. The result is what Koss engineers term "zero earth" at the point of the eardrum. Most low frequency distractions from airplanes, lawn mowers, fans or even office hum will be dramatically reduced by these noise canceling headphones.  

Koss QZ900 noise cancelling headphones will create less reason to turn up volume and overdrive the tiny amplifier in your portable electronics. This means greater efficiency, less distortion, deep rich lows, and sparkling highs.

Unlike most other noise cancelling headphones, QZ900s play music with or without the 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.

Features:
  • Revolutionary Active Noise Reduction (ANR) headphone system reduces harmful and annoying low frequency sounds in noisy environments
  • Closed leatherette ear cushion for added passive noise reduction
  • Cord unplugs to enjoy passive and active noise cancellation wirelessly
  • Straight single-entry 4 foot cord with in-line volume control
  • Fold flat for portability; carrying case included
  • Covered under the Koss Stereophones Limited Lifetime Warranty
  • Frequency Response: 20-20,000 Hz
  • Impedance: 32 ohms
  • Sensitivity: 100 dB SPL
  • Cord: Straight, Single Entry, 4ft
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Product Warranty Information

  Product warrenty information

 
All instruments in our catalogs and on our shopping site carry the manufacturers' warranties against defects in parts and workmanship. Should a defect occur within the manufacturer's warranty period, contact us immediately.

We will be glad to help facilitate the repair or replacement as specified by the manufacturer. The manufacturer will determine whether the defect is covered under their warranty; we do not make that determination.

Please note: U.S.-based manufacturers WILL NOT honor warranties for items sold and shipped outside the U.S. Also, if a school, school district, or board of education purchases an instrument and resells it to an individual, the manufacturer considers the warranty to be void. Warranties are extended only to the original purchaser!

All warranties, stated or implied are held with the product manufacturer and they vary from item to item. Consult the documentation that came with your product for details in addition to the information below.
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In 1953, John Koss began Koss Corporation by renting television sets to Milwaukee area hospitals, and soon turned his eye and ear to the budding Hi-Fi industry, creating the first Stereo- phone. Today, there is a quality Koss Stereophone for every personal listening need.
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