The Koss KSC75 are budget on-ear headphones with a stable ear-hook design. They're compact and will easily fit into your pockets. They also have an open design and a decently well-balanced sound which makes them a very affordable critical listening option but they may lack a bit of bass for more casual listeners. Unfortunately, they're not very durable and look a little cheap.
- Above-average sound quality.
- Stable and portable design.
- Poor noise isolation.
- Subpar build quality.
- Leaky at average volumes.
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The KSC75 aren't the best-looking headphones but they're lightweight and have a stable fit. Thanks to their ear-hook design they will rarely fall off your ears unless the non-detachable audio cable gets hooked on something. They're also easy to carry around on your person but do not come with a case. Unfortunately, they do not have any controls and their build quality does not feel very durable. The cable is flimsy and the ear cups look and feel cheap.
The KSC75 are budget clip-on on-ears. They're only offered in one color scheme and feel somewhat like airline headphones. They won't stand out and won't be a fashion statement. However, their simple utilitarian design may appeal to some listeners.
The KSC75 are lightweight and moderately comfortable headphones. They're on-ears with an ear-hook design that's stable but slightly uncomfortable. The hooks put a bit pressure behind your ears at first, and it's particularly worse if you wear glasses. However, the hooks stop feeling as intrusive after having the headphones on for a while.
Noise Canceling Control
The KSC75 have an ear hook design that's stable enough to run with. They're lightweight and barely move once you achieve a good fit. Unfortunately, they have a non-detachable cable that may get caught on something and yank the headphones off your ears. You can limit this issue by passing the cable under your clothes, but this means they won't be the ideal headphones for the gym or strenuous exercises.
These headphones have a small footprint and are quite easy to carry around on your person. They have a simple ear hook design, so they do not have a headband, and you can easily fold and fit them into your pockets. They do not come with a good case however, which is a little disappointing.
The build quality of these headphones is sub-par and feels cheap. The ear cups are not particularly dense, and they have thin non-replaceable audio cables. They're lightweight headphones, so they won't get damaged by a shoulder height drop. However, their build quality doesn't feel durable which is to be expected for their budget price range. On the upside, they also benefit from the Koss limited lifetime warranty.
The Koss KSC75 is an average sounding pair of open-back on-ear headphones. They have an excellent Mid Range, an open Soundstage, and perform very consistently across multiple humans. However, their Bass lacks low-end thump and rumble, their Mid Range sounds slightly muddy and their Treble is on the bright side. They also have a mediocre distortion performance, especially in the Bass Range.
Mediocre Bass Range performance. Low-bass, responsible for low-end thump and rumble, is lacking by more than 9dB which is typical of most open-back on-ears. Bass is relatively balanced but shows a tilt towards high-bass. High-bass is overemphasized by more than 3dB, adding a bit of boominess to the sound.
Very good Mid Range performance. Low-mid is over our target by about 3dB, making mixes slightly muddy and cluttered on these headphones. Mid is very consistent and well-balanced. High-mid shows a bit of tilt towards higher frequencies, nudging the upper harmonics of vocals/leads to the front.
Average Treble Range performance. Low-treble is over our target by about 3dB, giving excess presence to the vocals/leads. Treble and high-treble are relatively well-balanced, but slightly inconsistent.
Frequency Response Consistency
Avg. Std. Deviation
Very good Consistency performance. The maximum amount of deviation in the Bass Range across our human subjects is +/-3dB at 20Hz which is decent. However, the Mid and Treble Ranges show excellent consistency up to 10KHz with very little deviation.
Acoustic Space Excitation
Average Soundstage performance. Due to the on-ear design, these headphones don't interact with the pinna much, and therefore, their Soundstage may be perceived to be located inside the listener's head as opposed to in-front. However, since these on-ears have an open-back, their Soundstage will be relatively open and spacious sounding.
Driver Mismatch (Amplitude)
Driver Mismatch (Frequency)
Driver Mismatch (Phase)
Mediocre Imaging performance. Phase error is minimal and mostly inaudible, however the sharp shifts in the Treble Range may be audible to some. The main issue here however, is the phase mismatch between the L/R drivers of our test unit in the Treble Range which would have a negative effect on the stereo image of these headphones.
Total Harmonic Distortion
Weighted THD @ 90
Weighted THD @ 100
Below-average Harmonic Distortion performance. The KSC75 shows high amounts of harmonic distortion, regardless of the level, in the Bass and the Treble Ranges. This will have a noticeable negative effect on the clarity and purity of Bass, and would also make the higher frequencies sound harsh.
The HSC75 have an open design not meant to isolate listeners from ambient noise. Noise easily seeps into the ear cups which produces a more immersive listening experience but also means they won't be ideal for loud environments, like commuting via public transit. They also leak quite a bit and would not be suitable to use in quiet settings, as they might distract the people around you.
Poor Isolation. Due to the open-back design, these headphones isolate very little. They provide no reduction in outside noise in the Bass and Mid Ranges, and provide only 3dB of isolation in the Treble Range.
Overall Leakage @ 1ft
Poor Leakage performance. The significant portion of Leakage with these headphones is between 1KHz and 20KHz which is a broad range. Additionally, the overall level of Leakage is loud.
No active features.
Line of Sight Range
Audio while charging
In the box
- Koss KSC75 Headphones
The KSC75 like the Koss Porta Pros are not the most versatile headphones. They're flimsy and lacking in features. They also don't isolate much and leak due to their open design. However, they produce a decently balanced sound that lacks a little bass but should be good enough for most listeners. This makes them a decent option for critical listening but they might not be well-suited for other use cases.
The KSC75 Have a decently balanced sound. They have a good reproduction of Mid Range frequencies so instruments and vocals sound full and decently balanced throughout the mix. They lack a bit of Bass and their Treble Range is a bit inconsistent so they may sound overly sharp on some tracks. They have a relatively good Soundstage despite the small ear cups thanks to their open design which makes them a decent, budget option for critical listening but they won't be the ideal headphone for fans of Bass.
Not ideal for commuting. They do not block a lot of ambient noise and won't perform well in loud environments.
Mediocre at best for sports. They're lightweight, compact and have a stable clip-on design. The open ear cups also allows you to monitor your environment. However their non-detachable cable may yank the headphones off your ears, they have no control scheme and they're also not as breathable or as comfortable as the Koss Porta Pro.
Subpar for office use. They leak at higher volumes and don't prevent the chatter of a lively office from seeping into your audio.
Decent for Home Theater. They have a decent sound and if you watch movies on a pc or tablet then the relatively short cable and low latency of wired connection should be suitable for that use case. Unfortunately, the lack of range makes them poorly suited to watch TV at a distance unless you have an audio cable extension.