The Koss QZPro are flawed headphones that fail at delivering decent audio reproduction or adequate noise isolation. They are not comfortable, there are no satisfactory audio controls and the all-plastic build feels cheap and susceptible to breaking.
The Koss Quiet Zone QZ-Pro have a lot of flaws in their design and are uncomfortable. The cable is non detachable and does not provide in-line controls except a volume slider which is dissapointing. The build quality is too stiff and feels cheap, especially the sliding mechanism, which is just awkward and frustrating to use.
The QZ-Pro look a little cheap. The two-tone color scheme is esthetically pleasing but the low-grade plastic and odd hinge reduces their appeal significantly. The matte, silver ear cups are circular and coated with a soft black padding. The headband is lightly padded but oddly shaped due to the hinge and may be a turn off for some.
The Koss QZ-Pro are not very comfortable. The headband and earcup design is a little cumbersome and stiff and does not extend very well for larger heads. The ear cups, although decently padded, oddly do not provide a good seal, leaving gaps that feel uncomfortable and let sound leak in and out.
Button layout is very limited on the QZ Pros, with just one switch to activate the noise canceling. It's simple but looks and feels a little cheap. The audio cable, which is not detachable or interchangeable, only has a volume slider, which is disappointing.
The QZPro are somewhat portable. They have a unique folding mechanism that allows them to collapse into a compact format. However, they are one the larger side for over-ear headphones and will still take up quite a bit of space in a bag. They won't fit in a pocket and are too cumbersome to carry around on your person. They also do not come with a case or carrying pouch, which is disappointing.
Build quality is just passable. The QZ Pro look and feel cheap. The joints are made of dense plastic that feels moderately solid but also makes the hinges stiff. The headband, however, does not feel very solid and once on, adjusting the ear cups is very cumbersome. The sliding mechanism to extend the headband does not feel durable and does not extend very far. The padding on the ear cups and the headband is soft but looks susceptible to wear and tear.
They have a sub-par bass, a disappointing mid-range, and a poor treble. Additionally, their bass lacks thump and is excessively boomy, their mid-range is overemphasized and muddy, and their treble lacks presence and brightness. Their soundstage and distortion results are also mediocre. On the plus side, their performance is quite consistent from person to person.
The QZ Pro have disappointingly weak noise isolation performance. The active noise cancelling just generates a hiss that does nothing to block ambient noise from disturbing your listening experience. The poor isolation is not recommended for use in anything but a quiet environment. The placement of the earcups will make an imperfect seal certain heads. On the upside, they do prevent a fair amount of sound leakage if the fit is right.
Poor isolation overall. The passive isolation is decent, but starts relatively late - at around 800Hz - and only providing -30db (the minimum acceptable value) at 10Khz. The active noise-cancelling performance is even worse, starting to work above 100Hz and barely crossing 10dB of reduction at 400Hz.
Very good leakage performance. If they fit well and you get a good seal, listening at moderate volumes will not bother the people around you.
The QZPro only have noise canceling as an active feature. This makes them less versatile for other use cases except as noise canceling headphones, as they lack both wireless features or an app, to enhance and customize their sound. On the upside, the AAA cell delivers up to 40 hours of continuous playback.
The Quiet Zone Pro can last up to 40 hours of continuous playtime at average volumes. This gives them an above-average battery life and means you won't have to change the triple AAA battery as often, which is great for long flights or road trips. Unfortunately, they do not have any battery saving features like an auto-off timer but can continue playing audio even when the battery is completely drained.
No compatible app.
The QZ-Pro are not good everyday headphones. They don't isolate well. They have a poor sound quality, and they're bulky and cumbersome, heavy and leaky for casual use.
Not good for neutral listening. They have a bass-heavy sound quality and their closed back design limits their soundstage.
Not suitable for commuting. They're noise isolation is weak and does not block enough ambient noise fo busy commutes.
Not designed for sports. They have a poor control scheme and they're bulky and unstable.
Not good for office for office use. They have a poor control scheme, they're not too comfortable and poorly isolate listeners. On the upside, they don leak too much