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KOSS Black QZ-99 3.5mm/ 6.3mm Connector Circumaural Headphone

  • 40Hz-20KHz
  • 3.5mm/ 6.3mm Connector
  • Coiled, Single Entry, 8ft Cord Length
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Learn more about the Koss QZ-99


Noise Cancelling

General SPEC

Frequency Response
Input Impedance
60 ohms
102 dB SPL/1mW
3.5mm/ 6.3mm
Ear Coupling
Cord Length
Coiled, Single Entry, 8ft
15 oz


The Koss Quiet Zone QZ99 stereophone is an extra-durable stereophone that delivers amazing passive noise reduction. Designed initially for use with racing radio scanners and metal detectors, the QZ99 has been a favorite for a wide range of listeners who need to cut high levels of ambient noise.

Built to withstand the rigors of outdoor or indoor use, the QZ99 features both a 3.5 mm and 6.4 mm plug and will connect to most radios and scanners.

The QZ99 features neodymium magnet structures for outstanding clarity and definition.
Closed, Pneumalite ear cushions and extra-secure headband pressure create a complete seal around the ear eliminating all ambient noise from getting through.

A volume control on the ear cup allows for easy level adjustment if the sound source is out of reach. A Stereo/Mono switch extends your user flexibility.

Quick Info

Customer Reviews of the Koss QZ-99

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  • jan d.
  • 12/23/2014 9:22:47 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: Got these as a gift for my Husband. He says the sound, is great and they are comfortable to use. Primary use is for watching videos.

Cons: So far, no problems at all

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  • Jeremy T.
  • 10/16/2014 2:00:10 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggsFits what I wanted

Pros: Great noise cancelling considering the price. Much better than any other noise cancelling headset I have tried. My office environment gets loud enough to be a serious distraction, and these block out all background noise. These things work as good as the hearing protection when I worked in an industrial print factory.

the headphones are large enough to fit completely over the my ears.

Cons: The weight of these is slightly heavier, but still similar to hearing protection I used to wear in a factory. That means they are much heavier than any other music only headphones I have worn.

These things are mostly made for settings where you need sound while in a loud environment, not specifically for great music quality. There are not separate speakers for bass as on some medium to high quality music headphones so the bass suffers for music listening. that being said, the sound isn't bad.

But if you do your reading, you don't buy these for top of the line sound, but for noise cancellation.

Other Thoughts: Some notes from my old days working with industrial hearing protection ... in the morning the headset will be cold, and your head will be warm. As the headset warms up, it will create some air pressure next to your ear that is uncomfortable. To relieve, just occasionally break the seal next to your skin by briefly taking them off to let in some air until they warm up. They dont seem as uncomfortable to me as others seem to indicate, but then I am used to this kind of thing.

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  • Sergey G.
  • 10/8/2014 9:22:16 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week

2 out of 5 eggsits so uncomfortable!!! WOW!

Pros: Cheap. Fast Shipping. Sound is ok.

Cons: Super uncomfortable... did they test them on bricks? uncomfortable from the second you put them on. Start to really hurt after about 10 minutes. Cannot have them on more than 30 minutes. Its ridiculousness.

Other Thoughts: honestly, the fact that they are so uncomfortable, overshadows all other good qualities..

1 out of 1 people found this review helpful. Did you? Yes No

  • James E.
  • 8/6/2014 10:11:04 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsUncomfortable

Pros: Good sound.
Decent isolation.
Durable construction.

Cons: These headphones are uncomfortably tight. It's like putting your head in a vice.

Other Thoughts: I had another set from the same brand that I was happy with but they wore out after lots of use over several years. I was happy enough with them that I decided to stick with the brand.

I don't know if I just picked a bad model or what but I'm not too happy with my new set.

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  • Irving S.
  • 1/20/2014 9:50:34 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week

5 out of 5 eggsBest Lower Quality Headphoens Money can Buy

Pros: This is a very durable, very sturdy feeling headphone. The price is a wee bit high but the build quality feels very good so I can't complain. The headband over the head comes with a thicker pad. When you put this on your head, there is no discomfort that comes from the top of your head. It's worth mentioning that the side of your head does some of the work to keep the headphones up.

Sound quality is meh, but so are most headphones. There's nothing you can do about "Meh" headphones no matter where you go. These are just as good as any Beats headphones, which are grossly overpriced for the quality that they give.

Cons: It's not SUPER comfortable. It's certainly a tighter fit, but usage after a very long time is still very good. Basically they feel the same throughout the day. More of a preference thing than a con.

Other Thoughts: If you want a GOOD pair of "Meh" quality headphones, this is a great buy. But these are a bit tight on your head so you may want to "try before you buy" if you can. I'm perfectly fine with a tighter fit.

1 out of 1 people found this review helpful. Did you? Yes No

  • RYAN H.
  • 11/6/2013 8:25:00 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsMaybe I just have a weak neck

Pros: Love the length of the chord, all of my previous headphone chords would get caught under chair wheels.

Cons: It's quite heavy. According to the cost calculator when I tried to return it, they are 4 lbs. As pretty much everyone has mentioned, they're tuned to the mids so don't expect to get the kind of range you need for working with music or sound effects. One reviewer claims that it cancelled out the sound of grinding metal but I can still hear my roommates talking through a closed door with music playing.

Other Thoughts: I was willing to lose $20 to return these but was unable to pay for the return label. (keep getting a CVV2 error)

1 out of 1 people found this review helpful. Did you? Yes No

  • Kyle C.
  • 10/19/2013 10:47:14 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggs

Pros: Durable with decent sound. I wear them about 7-9hours a day during my job. They do after a bit start to hurt the ear but I can usually reposition them to fix that. The volume knob is handy, as I can turn it down when someone is speaking. The noise canceling part works well. With moderate volume, it cuts out the sounds of grinding on metal. Also works well for cutting the grass.

Cons: The bass production is lacking, even with adjusting of equalizer on my ipod. I had an older model of Koss that I liked better. Also had Sennheiser ear buds that had more bass. My cat chewed through both cords, hence why I now have these.

Other Thoughts: The padding on the head band could be better. As mentioned above, I wear them a lot. At times I'll hang them around my neck to give my ears a break. This isn't the most comfortable thing to do, but helps if you shorten them up all the way.

I saw a few people mentioned the cord not being long enough. I fail to see this issue. I put my ipod in the back pocket and have to wrap up a good 12in of cord and put in my front pocket. For home use, maybe, but I have an extension cord for that.

All in all I have put a ton of hours through these and got my money's worth out of them. However, I'm looking for something new as I want to hear bass in my music.

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  • Clayton B.
  • 7/4/2013 8:32:15 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggs

Pros: Sound is great, watched a James Bond movie wearing them and I couldn't be happier. I thought that they fit pretty comfortably too. I would definitely buy them again.

Cons: wish it came with a case

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  • Ethan S.
  • 3/13/2013 8:37:15 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsBest Headphones I've ever bought

Pros: Reasonable price, the noise cancellation is on par with the headset I use at the rifle range and the sound is astounding. I have owned $100.00+ headphones that did not have sound near this good and the sound level adjusting nob and stereo mono switch ate both very handy.

Cons: As with any over the ear headphones they do get uncomfortable after a while, and the cord is a bit shorter than I would like.

Other Thoughts: For the price you can't miss with these.

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  • Jennifer S.
  • 3/7/2013 6:19:01 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsGarbage

Pros: Cheap

Cons: They are already malfunctioning less than 2 months after I bought them. I have to continuously hold down the stereo button to get stereo. The sound is like my $10 clock radio.

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