| | |  | Noise Canceling Headphones | Home » » » » Koss QZ-77 Active Noise Reduction Ear Plug System | | | | | | | Description: | | Koss QZ77 active noise cancellation stereophone features both Active Noise Reduction (ANR) and Passive Noise Reduction (PNR) technology which eliminate harmful and unwanted noise while still providing the ultimate in stereo sound. The Koss QZ77 provides maximum noise reduction in a compact design. The ANR technology utilizes tiny microphones embedded in the ear piece. These microphones sample the surrounding low-frequency noise and transmit information about those undesirable sounds to a processing circuit. The processing circuit, in turn, generates mirror image "anti-waves" that are 180 degrees out of phase and relays those anti-waves back to the stereophone. When the offending sound waves encounter the waves generated by the QZ77, the two counteract each other at the wearer's ear. The offending hum and buzz is reduced and a peaceful listening environment is created where once there was noise. Low frequency noise below 1000 Hz, such as jet, bus or automotive engines, is reduced by an average of 10 dB. Noise reduction is even greater for noise below 200 Hz, offering a 15 dB of protection against low frequency noise. Designed after another popular Koss model, The Plug, the stereo earbud features a dynamic element that is positioned just outside the ear. The element is connected to a tubular port structure that is inserted on a soft expandable cushion into the ear canal. Soft foam "memory" cushions expand for a custom fit to improve isolation and enhance | | | Features: | |
• Reduces harmful and annoying low frequency sounds in noisy environments
• Specialty ear cushion material forms slowly in ear canal providing a custom fit and maximum isolation
• Dynamic stereophone element for extended frequency response (10 - 20,000Hz)
• Compact design for convenient travel and portability
• Ideal for in-flight use
| | | Product Details: | | | Product Length:
| 6.0 inches | | Product Width:
| 1.63 inches | | Product Height:
| 9.25 inches | | Product Weight:
| 0.25 pounds | | Package Length:
| 6.2 inches | | Package Width:
| 5.0 inches | | Package Height:
| 2.0 inches | | Package Weight:
| 0.25 pounds | | Average Customer Rating:
|  based on 10 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
 ( 10 customer reviews )
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Most Helpful Customer Reviews
11 of 11 found the following review helpful:
 good depending on your needsMar 24, 2009
By Rafael B. Nonato
Things I liked about these earplugs: (1) They look cheap. And I don't want to be mugged. (2) Contrary to what other people stated in their reviews, I found the noise cancellation pretty good. I was traveling right beside the plane jets and when I turned the noise cancellation on (without even turning on my ipod), the hiss of the jets would nearly die out. (3) The passive noise reduction is pretty good too. I forgot to buy batteries and was using it without the noise cancellation in the subways and I say it was worth it. (4) the sound quality is decent. But don't expect that any amount of money you expend on earplugs is going to buy you bose-like bass.
Bad things: (1) They go deep into the ear canal. I can't wear them for too long. In the beginning it is not uncomfortable. The rubber in the earplugs is soft enough. But after like three hours I want to take them off.
All in all, I think this is a good option for noise-cancelling earplugs, even without taking price into consideration. But don't expect any earplugs to compare to $500 bose earphones.
2 of 2 found the following review helpful:
Pretty goodFeb 23, 2009
By L. Reed
"student mom"
The noise reduction is good, though the sound quality was just okay and I have had to change the battery with only a month use.
4 of 5 found the following review helpful:
 WorthlessDec 31, 2007
By Jocelin D
I purchased these earbuds to use when traveling. They are awkward to use, the sound is tinny with no bass whatsoever, and the noise cancellation is nonexistent. When you turn on the noise cancellation it ups the volume a bit and adds a quiet hiss, you can still hear everything going on around you. I am actually astonished at how awful these earbuds are. I was hoping for a 50% reduction in background noise, instead I have a product that is useless in any situation. Traditional earbuds are far superior. I passed the Koss earbuds on to two other people to try with the exact same results, no one wants them even for free.
Bad product, bad design, waste of money.
2 of 3 found the following review helpful:
 Active noise cancellation non-existentOct 01, 2009
By Ostap Bender
I have had a few active noise cancellation headphones in the past, all over-the-ear type. They were satisfactory, providing a considerable reduction in machinery noise.
I also owned a few ear-buds with passive noise-reduction, and those work great (including Koss "spark-plug" in-ear phones). I was looking for the ones that would combine both methods, as I think that has the potential to produce a very good overall noise-blocking result, so I had big expectations of these. What I got is a classic case of "you get what you pay for". To be fair: sound quality is very good for the price (far exceeds anything you get from a stock earbuds). Comfort is mediocre. Passive noise reduction was OK, but not great. Active noise cancellation simply doesn't exist in this model. At all! This is not a total loss though: the active noise cancellation unit doubles as an amplifier/volume controller, and given a fair performance in passive noise reduction, they can still be used (given the low price, of course).
Overall I have to recommend against buyng this model.
Decent, with a few quirks.Nov 23, 2011
By Dan Evans
I picked a pair of these up during a clearance sale at a local store, and initially didn't have very high expectations. They look and feel cheap, but they were fairly inexpensive, so I figured I'd give them a shot. After listening to them, though, I have to admit I was pleasantly surprised. The sound quality is good, with nice clear highs and reasonably solid bass, limited mostly by the fit of the Koss "Spark Plugs".
Unlike most in-ear headphones, these only come with one size tip (although they do include an extra pair). In my case, these were a little on the small side, and didn't seal very well. I ended up ordering an assortment of tips directly from Koss, and had better results using a three-level silicone version. While the included foam tips are very soft and comfortable, they're nowhere near as well-made as the Comply tips used by most other brands. On several occasions I've had them fall off the drivers, and the fairly rigid plastic tube through the center has a tendency not to stay attached to the foam.
The noise cancelling works reasonably well, although I did find the hiss from the ANC to be slightly louder and more annoying than most of the other models I've tried. Overall, these are a decent value, but they have enough quirks that you might be better off spending a little more on something like the Audio-Technica ATH ANC23 QuietPoint - Headphones ( in-ear ear-bud ) - active noise canceling which offer a better assortment of tips and marginally improved noise cancelling. I also own a pair of the Audio-Technicas, and have found that they feel better constructed and don't look nearly as silly as these when sticking out of your ears.
See all 10 customer reviews on Amazon.com
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