Koss Porta Pro KTC Headphones Review

The Koss Porta Pro have a unique and retro appeal that's not for everyone. They have small plastic on-ear ear cups that are attached to a thin metal frame. That combined with the fragile-looking audio cables and overall flimsy build quality, makes them feel like cheap airline headphones.

The Koss Porta Pro are extremely lightweight for on-ear headphones. The headband is flexible and easily adjustable, which makes them above-average comfortable. They're not too tight, however, they do have an adjustable tension slider on the ear cups. It doesn't change much to the fit but it's a nice addition to the design. Unfortunately, they're poorly padded so they don't provide any extra comfort apart from their lightweight fit.

The KTC version of the Koss Porta Pro comes with an inline control module that provides call/music, track skipping, and volume controls. This is a definite upgrade from the regular Porta Pros as it gives some control over your audio. However, the buttons on the module feel cheap and shallow. They don't provide a good tactile feedback and are a bit frustrating to use.

The Koss Porta Pro are one of the most breathable on-ear headphones we've tested. They have an open-back design and since they just rest on your ears and do not seal them like over-ears do, they barely cause any temperature difference even while running or working out. They may not be stable enough for sports but they are definitely breathable enough for even intense workout regiments.

The Koss Porta Pro KTC fold into a small, compact format that's easy to carry around and even fits in some pockets. They're on the smaller side for an on-ear model, which combined with the unique folding mechanism makes these headphones quite portable. They will easily fit into most bags and shouldn't be too much of hassle to carry on your person.

These headphones come with a simple faux leather pouch that will protect the headphones from scratches and minor water exposure. However, it won't shield the headphones against falls or any physical damage.

The build quality of these headphones is subpar and feels cheap. The headband is a thin metal frame with no padding and an awkward sliding mechanism to adjust its size. The ear cups are not particularly dense, although their lightweight build makes hard falls less damaging. Unfortunately, they don't feel durable. They have a lot of moving parts that will wear over time. The audio cables are thin, frail and could snap relatively easily from regular use. On the upside, they come with a reliable lifetime warranty as long as you're able to send the headphones back to Koss.

These headphones have a moderately stable fit. The lightweight and relatively flat ear cup design make them not sway much when used while running. However, they're not the most stable headphones. The slight lack of tightness means they might fall off during high-intensity exercises and the audio cables are a little bothersome and non-detachable. They will yank the headphones off your head if hooked on something.

• 'Koss Porta Pro' KTC Headphones
• Carrying pouch
• Manual

The frequency response consistency is very good. In the bass range, we measured about 4dB of deviation in delivery across our human subjects. This is subtle and not very noticeable since the deviation happens mostly in the sub-bass region. The treble delivery also deviates by about 4dB across multiple re-seats, which is noticeable but within good limits.

The Koss Porta Pro have a decent bass. LFE (low-frequency extension) is at 32Hz, which is decent. Low-bass, responsible for the thump and rumble common to bass-heavy music and sound effects is lacking by 3dB. This lack will be rather subtle since sub-bass frequencies are difficult to hear and are mostly felt. Mid-bass, responsible for the body of bass guitars and punch of the kick drums, is hyped by about 4dB. Also, high-bass, responsible for warmth is overemphasized by more than 5dB, making the overall bass of these headphones boomy and muddy.

The mid-range performance of the PortaPro is very good. The response throughout the range is very even but consistently overemphasized. Low-mid is over our neutral target by more than 3dB. This thickens the vocals and lead instruments a bit and makes the overall sound rather muddy. High-mid is overemphasized by about 2dB, bringing a bit of excess projection and intensity to vocals and instruments.

The treble performance of the PortaPro is about average. The response throughout the range is rather uneven, so some region are overemphasized and some other regions are underemphasized. However, the overall profile of the treble is a bit on the warm side. The dips around 4KHz and 7KHz negatively affect the detail and brightness of the sound, especially on vocals and lead instruments.

The Koss Porta Pro have excellent imaging performance. Weighted group delay is at 0.26, which is very low. Also, the GD graph also shows that the entire group delay response is below the audibility threshold. This results in a tight bass and a transparent treble reproduction. Additionally, the L/R drivers of our test unit were exceptionally well-matched in frequency, amplitude, and phase response, which results in an accurate placement and localization of objects (voices, instruments, video game effects) in the stereo field.

The soundstage is sub-par. Due to their on-ear design, these headphones don't interact with or activate the resonances of the pinna. Therefore their soundstage will be perceived as small and located inside the listener's head. However, due to their open-back design, they will sound a bit more open compared to closed-back headphones.

The Koss Porta Pro have poor isolation. Since they have an open-back, this is expected and part of their design. Therefore, they don't provide any isolation in the bass and mid ranges and provide only about 6dB of isolation in the treble range, which is barely noticeable.

The isolation performance of the Koss Porta Pro is sub-par. This is expected and part of their design, since they are open-back headphones. The significant portion of their leakage is spread between 1KHz and 16KHz, which is a broad range. This indicates a leakage that is quite bright sounding. The overall level of their leakage is also rather loud. With the music at 100dB SPL, the leakage at 1 foot away averages at 48dB SPL and peaks at 68dB SPL, which is noticeably louder than the noise floor of an average office.

The Koss Porta Pro have a mediocre microphone. In quiet environments, speech recorded or transmitted with this mic sound noticeably thin and rather lacking in detail. However, it will have a decent amount of air and openness to it and will be decently intelligible. In noisy situations, they do an average job separating speech from background noise, but will struggle to do so in louder environments like a very busy street.

The in-line microphone of the Koss Porta Pro has a sub-par recording quality. The LFE (low-frequency extension) of 494Hz indicates a recorded/transmitted speech that sounds noticeably thin. The HFE (high-frequency extension) of 10KHz results in a speech that has a decent amount of air and openness to it. However, the 20dB dip around 6KHz negatively affects the detail and brightness of speech. It'll still be decently intelligible though, since speech comprehensibility is mostly dependent on the 500Hz-4Khz range.

The noise handling of the microphone is average-at-best. It achieved a speech-to-noise ratio of 15dB SPL in our SpNR test, indicating they are best suited for quiet and moderate environments. In loud places, they will struggle to fully separate speech from ambient noise.

These headphones do not have any active component and therefore do not need a battery life like the Koss Porta Pro Wireless.

The Koss Porta Pro do not come with any dedicated app of software support.

These headphones are wired and do not have a Bluetooth connection. If you want a similar but wireless design then consider the Koss Porta Pro Wireless.

These headphones have negligible latency suitable for watching movies and gaming because they have a wired connection (see our recommendations for the best wired headphones).

The Porta Pro KTC have a 1/8"TRRS audio cable with an inline remote microphone that is compatible with the PS4 but not the Xbox One. This is most likely due to The iOS-specific audio cable.

The Koss Porta Pro do not have a dock. If you need a headset with a dock that also has a wired connection for gaming or watching movies, then consider the SteelSeries Arctis 7.