Koss QZ 900 Noise Canceling Headphones

By Koss

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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.

What's Included

  • Headphones with closed leatherette ear cushion for added passive noise reduction
  • Carrying case
  • Straight, single entry 4 foot cord


  • Sound: Active Noise Reduction (ANR) headphone system reduces harmful and annoying low frequency sounds in noisy environments
  • Volume: In-line volume control
  • Cord: Unplugs for wire-free passive and active noise cancellation
  • Structure: Fully collapsible
  • Structure: Extra-soft, padded headband
  • Limited Lifetime Warranty

Simple Returns

**Extended Holiday Return Policy In Effect, Purchases made after Nov 1st 2015, may be returned until January 31st, 2016. 


If, for whatever reason, you are not satisfied with your purchase, you can return it to HRM USA within 45 days of purchase date subject to conditions below. Claims for items damaged in transit must be received within (3) business days of receipt of merchandise. Refunds & Credits Refunds on returned items will be issued to the same payment as tendered at the time of purchase or store credit. Once we receive and inspect the product you will be issued a credit back to your account. Please allow 5-7 Business days for a credit to appear on your account. If payment was made by check, the refund check will not be issued within 7- 10 business days after receipt of return.


If the item is returned to us for exchange, please allow 2-5 business days for the replacement to be processed and shipped. All returns are shipped with our Economy shipping method and arrive within 2-10 Days.


Please read all conditions below. If conditions are not met, HRM USA reserves the right to refuse the return or to charge a restocking fee not less than 10% or a $2.95 minimum fee. 

All returned items must be in new condition, in their original unaltered box (including the UPC code being intact) and must include all packing material, blank warranty cards, manuals,and accessories. Defective items may be exchanged for the same model or manufacturer's equivalent model. Please call us at 800-403-8285 for assistance. Please allow time to discuss any issues you may be experiencing as we may recommend tech support to resolve any issues prior to exchange.

No Used Returns/Exchanges on the following

  • Hydration Packs, Water Bottles once any of the packaging has been opened or safety seals have have been broken.
  • Computers and Computer Software, once any of the manufacturer's packaging has been opened.
  • Heating Pads, once safety seal has been broken
  • Electronic Software is not returnable or refundable once opened.
  • All consumable items or hygienic items (e.g., Gels, Energy Chomps, Elixirs, etc.) once unwrapped or seal broken.
  • Special Order merchandise, Clearance, or any item indicated on the website as non-returnable.
  • Imprinted products.
  • Suunto Products that have been used
  • HRM USA Stores Gift Cards are redeemable for merchandise only and may not be redeemed for cash.

HRM USA is dedicated to always offering the best value to our customers. We will match the price, at the time of purchase any product sold by an Authorized Dealer of that specific product offered at lower price. Proof of lower price is required.

Here's how to qualify for Price Match:

  • If you find a qualifying lower price online, call 1-800-403-8285 or 215-259-2700 Between 9am - 6pm EST and one of our employees will assist you with the price match request.
  • On qualifying products, HRM USA will then verify the current price to complete the price match.

Some exclusions apply:

  • Services such as custom imprinting, extended warranties, ect. 
  • Items must be in advertised as New Condition, HRM USA will not price match against Used, Newly Overhauled, Manufacturer Refurbished, or Open Box Returns
  • Out of Stock or Preorder items do not qualify
  • Products shipped from or sold by third-party sellers (Marketplace Sellers) on Website
  • Price Match will take into consideration final value costs, including shipping and taxes. 


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