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    Table of Contents
  1. Intro
  2. Design
    1. Style
    2. Comfort
    3. Controls
    4. Stability
    5. Portability
    6. Case
    7. Build Quality
    8. Breathability
    9. Cable
    10. Front
    11. Angled
    12. Side
    13. Rear
    14. Top
  3. Sound
    1. Bass
    2. Mid
    3. Treble
    4. Frequency Response Consistency
    5. Soundstage
    6. Imaging
    7. Total Harmonic Distortion
  4. Isolation
    1. Noise Isolation
    2. Leakage
  5. Active Features
    1. Wireless
    2. Battery
    3. App Support
  6. In the box
  7. Conclusion
  8. Q&A
Reviewed on Oct 17, 2016 , Marc Henney, Jean-Christophe Lamontagne

Koss Porta Pro
HEADPHONES REVIEW

Usage Ratings
5.8Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
7.3Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
4.5Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
Score components:
6.1Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
Score components:
5.3Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
Type : On-ear
Enclosure : Open-Back
Wireless : No
Noise-Cancelling : No
Mic : Yes
Transducer : Dynamic

The Koss Porta Pro KTC deliver a good sound at an affordable price. They're lightweight, comfortable, and have a portable, retro design that will work for some. However, they feel flimsy and cheap, they don't block any noise, and the open design leaks at higher volumes.

Test Results
Design 6.8
Sound 7.2
Isolation 3.3
Active Features 0
Pros
  • Lightweight and comfortable design
  • Above-average audio reproduction.
Cons
  • No isolation from ambient noise.
  • Weak and flimsy build quality.
  • Leaky at higher volumes.

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6.8

Design

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Score components:
Koss Porta Pro  Design Picture

The Porta Pro have a straightforward, retro design that will work for some but may look too cheap for others. They're lightweight, comfortable and don't exert too much clamping pressure for an on-ear model. The KTC version of the Porta Pros comes with a convenient but poorly built control module. Unfortunately, they're not very durable headphones. They're flimsy, have a lot of moving parts, and the audio cables are thin and non-detachable. On the upside, they have a pretty generous lifetime warranty.

Style
Koss Porta Pro  Design Picture 2

The Koss PortaPro 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.

7.5 Comfort
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What it is: Adjustability and degrees of freedom, pressure, stiffness and weight.
When it matters: When the headphones are going to be used for long durations.
Score components: Subjectively assigned
Koss Porta Pro  Comfort Picture
Weight : 0.14 lbs
Clamping Force
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What it is: The force that the headphones exert on your head, once you have them on. This is purely a measurement of the force applied, which does not take into account the earpad's surface area and the resulting pressure you will feel, on or around your ears.
When it matters: The tighter the headphones, the more force they put on your head. This can get uncomfortable or cause pain and soreness during long listening sessions.
:
0.43 lbs

The 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 its a nice addition to the design. Unfortunately, they're poorly padded so they don't provide any extra comfort apart from their lightweight fit.

7.3 Controls
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What it is: The control scheme of the headphones, the number of functions provided, button layout and ergonomics as well as the quality of tactile feedback.
When it matters: If you want to control volume, pause your music or make phone calls without directly interacting with your audio device.
Koss Porta Pro  Controls Picture
Ease of use : Mediocre
Feedback : Subpar
Call/Music Control : Yes
Volume Control : Yes
Noise Canceling Control : N/A
Talk-Through : N/A
Additional Buttons : No

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 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 bit frustrating to use.

6.5 Stability
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What it is: How the headphones are designed to prevent them from slipping off your ears or falling off your head.
When it matters: If you plan on using the headphones while doing sports or other physical activities that requires a lot of movement.
Score components: Subjectively assigned
Koss Porta Pro  Stability Picture

These headphones have a moderately stable fit. The lightweight and relatively flat ear cup design makes 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 of your head if hooked on something

7.3 Portability
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What it is: The volume of space occupied by the headphones when folded into their most compact format.
When it matters: If you're often on the move and need to carry your headphones in a bag, purse , or pocket.
Score components:
Koss Porta Pro  Portability Picture
L : 3.50 "
W : 3.31 "
H : 2.25 "
Volume : 26.1 Cu. Inches

The Koss Porta Pro 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.

5.5 Case
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What it is: The provided carrying options to protect your headphones when transporting them.
When it matters: To prevent damaging your headphones, if you often carry them in your bag or pocket.
Score components: Subjectively assigned
Koss Porta Pro  Case Picture
Type : Pouch

Comes 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.

5.5 Build Quality
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What it is: Durability, material quality, cheap/expensive feel.
When it matters: When the headphones are going to be used by multiple users (classes/studios), by children, in tough conditions, on a daily basis, or for exercise.
Score components: Subjectively assigned
Koss Porta Pro  Build Quality Picture

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 your able to send the headphones back to Koss.

9.1 Breathability
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What it is: How hot the headphones get when you wear them for an extended period of time.
When it matters: If you often have long listening sessions or use your headphones while doing physical activities like running or working out.
Score components:
  • 100% Avg.Temp.Difference
Koss Porta Pro  Breathability Before Picture Koss Porta Pro  Breathability After Picture
Avg.Temp.Difference : 0.9 C

Cable
Koss Porta Pro  Cable Picture
Detachable : No
Length : 4.11 ft
Connection : 1/8" TRRS

Front
Angled
Side
Rear
Top
7.2

Sound

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What it is: How accurately the audio is reproduced. The tests are performed with the headphones' most commonly used features enabled (noise-cancelling, wireless, etc.)
Koss Porta Pro  Frequency Response
7.2 Bass
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What it is: Frequency Response from 20Hz-250Hz
When it matters: When the material is heavy on bass frequencies, such as those of kick drums and bass guitar.
Score components:
Koss Porta Pro  Bass
Std. Err.
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What it is: The amount of deviation (weighted standard error) in bass frequency response (20Hz-250Hz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) bass performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.96 dB
Low-Frequency Extension
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What it is: The lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: Shows how extended the bass is.
Good value: <40Hz
Noticeable difference: 5Hz
:
32.21 Hz
Low-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 20Hz-60Hz.
When it matters: Kick drums and low frequency effects get their 'thump' from this range. Mostly felt than heard.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-3.01 dB
Bass
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What it is: The average amount of over/under-emphasis in frequency response from 60Hz-120Hz.
When it matters: Melodic bass instruments have most of their fundamental frequencies in this range. This is where the 'body' and 'punch' of the bass sits.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
3.51 dB
High-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 120Hz-250Hz.
When it matters: Most instruments get their warmth and full-ness from this range. When over-emphasized, mixes tend to get muddy and boomy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
5.07 dB

8.2 Mid
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What it is: Frequency Response from 250Hz-2KHz
When it matters: When the material is heavy on mid-range frequencies. This is the case for the majority of audio content.
Score components:
Koss Porta Pro  Mid
Std. Err.
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What it is: The amount of deviation (weighted standard error) in mid frequency response (250Hz-2.5KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) mid performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
2.36 dB
Low-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 250Hz-500Hz.
When it matters: Most instruments have their fundamentals or low harmonics in this range. Over-emphasis in this range sounds boxy. Under-emphasis, thins out the vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
3.3 dB
Mid
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What it is: The average amount of over/under-emphasis in frequency response from 500Hz-1KHz.
When it matters: This range is occupied mostly by upper harmonics. Over-emphasis sounds forward and honky. Under-emphasis pushes instruments to the back of the mix.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
0.96 dB
High-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 1KHz-2KHz.
When it matters: Most instruments, especially vocals, get their intensity and clarity from this range. Over-emphasis sounds harsh, under-emphasis sounds weak and distant.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
1.7 dB

6.5 Treble
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What it is: Frequency Response from 2KHz-20KHz
When it matters: When the material is heavy on high-range frequencies, such as voice, cymbals, and any other material where brightness, brilliance and airiness is desired.
Score components:
Koss Porta Pro  Treble
Std. Err.
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What it is: The amount of deviation (weighted standard error) in treble frequency response (2.5KHz-20KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) treble performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
4.69 dB
Low-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 2KHz-5KHz.
When it matters: Almost all instruments rely on this range for their presence, detail, and articulation. Over-emphasis can sound harsh and painful. Under-emphasis hurts the comprehensibility of vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-0.54 dB
Treble
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What it is: The average amount of over/under emphasis in frequency response from 5KHz-10KHz.
When it matters: This is the sibilance range. Cymbals, vocals, and lead instruments rely on this range for brightness and presence. Over-emphasis sounds piercing and painful, under-emphasis sounds dull and lispy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-2.44 dB
High-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 10KHz-20KHz.
When it matters: This range gives brilliance and airiness to the sound. Over-emphasis sounds hissy, under-emphasis sounds closed-up and lifeless.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-6.77 dB

8.0 Frequency Response Consistency
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What it is: The amount of deviation of each frequency response pass, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Score components:
Koss Porta Pro  Consistency L Koss Porta Pro  Consistency R
Avg. Std. Deviation
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What it is: The average amount of deviation in frequency response of 5 re-seats, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Good value: <0.5
Noticeable difference: 0.1
:
0.39 dB

7.1 Soundstage
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What it is: Soundstage qualities are not inherent to the audio content, the headphones have to 'create' them rather than 'reproduce' them. They determine whether the sound is perceived to be coming from inside or in front of the head, how open and spacious the soundstage is, how much the headphones acoustically interact with the environment, and how strong the phantom center is.
When it matters: When an accurately produced, large and spacious soundstage, similar to that of a stereo loudspeaker setup is desired.
PRTF Error
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What it is: The average amount of deviation in Pinna-Related Transfer Function of the headphones, compared to that of a loudspeaker. Whether the soundstage is perceived to be unnatural, located inside or in front of the head, is dependent on this quality. The more the headphones activate the HRTF resonances of the ear (similar to what loudspeakers do), the more the soundstage will be pulled out from inside the listener's head. This quality affects both stereo and mono content.
When it matters: When a natural, in-the-front soundstage is desired, similar to that of a loudspeaker.
Good value: <5
Noticeable difference: 0.5
:
7.25 dB
Openness
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What it is: How open the headphones are, and how open and spacious they sound. This quality affects both stereo and mono content. This test differentiates between acoustically and electronically produced crosstalk and only takes the acoustically generated crosstalk into account. This value is the inverse of the Noise Isolation test score.
When it matters: When an open, wide and roomy sound is desired. A value of 10 indicates a fully open headphone, and a value of 0 indicates a fully closed headphone.
Good value: >7.5
Noticeable difference: 0.5
:
9.6
Acoustic Space Excitation
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What it is: How loud the headphones are, and how much they excite their environment acoustically. If the headphones are loud and open enough, the sound leaking from the headphones takes some of the characteristic of its environment (reflections/reverb) before reflecting back into the open headphones and to the listener's ears. This quality affects both stereo and mono content. This value is the inverse of the Leakage test score.
When it matters: When an open, wide and roomy sound is desired.
Good value: >7.5
Noticeable difference: 0.5
:
4.7
Correlated Crosstalk
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What it is: How strong and solid the phantom center is. This is mostly a stereo quality and its effects on mono content are minimal. This test is sensitive to the phase of the crosstalk and whether it is produced acoustically or electronically.
When it matters: When a true reproduction of the stereo image is desired. A value of 0 indicates no crosstalk, or that the existing crosstalk is not correlated enough to affect the phantom center. A negative score means the crosstalk is out of phase with the original signal, resulting in a slightly wider stereo image at the expense of creating a 'hole' at the center of the stereo field. A positive score means the crosstalk is in phase and positively affecting the phantom center.
Good value: >1dB
Noticeable difference: 0.3dB
:
-0.12 dB

6.9 Imaging
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What it is: Imaging qualities are inherent to the audio content, the headphones have to 'reproduce' them rather than 'create' them. They determine how accurately the objects are positioned in the stereo image, and how transparent the imaging is.
When it matters: When accurate positioning of the objects in the stereo image, and clear and transparent imaging is desired.
Koss Porta Pro  Phase Response
Phase Error
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What it is: The average amount of deviation in the phase, from the ideal flat response.
When it matters: When an accurate and transparent imaging is desired.
Good value: <60°
Noticeable difference: 10°
:
45.8 °
Driver Mismatch (Amplitude)
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What it is: The Left/Right balance of our test unit, that is, the amount of amplitude difference between the left and right drivers. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When a properly balanced stereo image and low manufacturing tolerance is desired. A poor score indicates a noticeable difference in level between the left and right drivers.
Good value: <0.3dB
Noticeable difference: 0.1dB
:
1.04 dB
Driver Mismatch (Frequency)
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What it is: The amount of difference (Std. Err.) between the frequency response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be 'holes' in the stereo image at certain frequencies.
Good value: <2dB
Noticeable difference: 0.1dB
:
2.31 dB
Driver Mismatch (Phase)
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What it is: The amount of difference (Std. Err.) between the phase response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be inaccuracies in the stereo image reproduction at certain frequencies.
Good value: <90°
Noticeable difference: 30°
:
83.28 °

6.9 Total Harmonic Distortion
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What it is: The subtle, unwanted frequencies (harmonics) produced alongside the intended frequencies.
When it matters: When clean and pure sound reproduction is desired, though its effect is not as noticable as frequency response.
Score components:
Koss Porta Pro  Distortion
Weighted THD @ 90
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What it is: The overall amount of harmonic distortion measured at 90dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at moderate listening levels.
Good value: <0.100
Noticeable difference: 0.1
:
1.64
Weighted THD @ 100
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What it is: The overall amount of harmonic distortion measured at 100dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at loud listening levels.
Good value: <0.300
Noticeable difference: 0.1
:
17.09

3.3

Isolation

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Score components:

These headphones are not meant to isolate listeners from ambient noise. The open design means they let a lot of ambient noise seep into the ear cups to produce a more immersive listening experience. Unfortunately, this 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.

2.3 Noise Isolation
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What it is: How much outside noise is blocked out by putting the headphones on.
When it matters: If the headphones are going to be used in a noisy envinronment (airplane, subway, etc.)
Score components:
Koss Porta Pro  Noise Isolation
Overall Attenuation
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What it is: The overall amount of environmental noise reduction in dB.
When it matters: In loud envinronments like planes, trains, offices, etc.
Good value: <-20dB
Noticeable difference: 1dB
:
-1.7 dB
Bass
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What it is: The overall amount of noise isolation in the bass range (20Hz-250Hz).
When it matters: When the outside noise is bass-heavy, like in airplanes.
Good value: <-15dB
Noticeable difference: 1dB
:
-0.45 dB
Mid
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What it is: The overall amount of noise isolation in the mid-range (250Hz-2.5KHz).
When it matters: When the environment's noise is mid-heavy, like in an office.
Good value: <-15dB
Noticeable difference: 1dB
:
0.57 dB
Treble
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What it is: The overall amount of noise isolation in the treble range (2.5KHz-20KHz).
When it matters: When the environment's noise is treble-heavy. Although uncommon, areas with sharp sounds fall under this category.
Good value: <-30dB
Noticeable difference: 1dB
:
-5.6 dB
Self-Noise
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What it is: The amount of noise created by the active electronics of the headphones (if applicable), measured from 300Hz-20KHz. Applies mostly to wireless and noise-cancelling headphones.
When it matters: If too loud, it could become distracting when listening to quiet material like podcasts and audiobooks.
Good value: <16dB
Noticeable difference: 1dB
:
0 dB

Poor isolation. Due to the open back of these headphones, the isolation is weak by design. They barely isolate any external sound, failing to achieve more than 6dB of isolation in the treble range.

5.3 Leakage
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What it is: The amount of sound bleeding out of the headphones.
When it matters: When the listener doesn't want people around them (in office, recording studio, etc.) to hear what is being listened to.
Score components:
Koss Porta Pro  Leakage
Overall Leakage @ 1ft
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What it is: The amount of sound leakage heard 1 foot away from the user, while the user is listening to a 100dB SPL signal.
When it matters: When you don't want people hear what you are listening to.
Good value: <35dB
Noticeable difference: 1dB
:
48.28 dB

Poor leakage performance. The Porta Pro's open-back design leaks a lot, even though on-ears are usually not very leaky. The significant portion of leakage is between 1Khz-20KHz, which is quite a broad range. The overall leakage level is also quite loud.

0

Active Features

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What it is: Headphones with active components that require a battery. This includes noise cancelling and wireless headphones that actively reduce noise or transmit audio via a wireless connection.
When it matters: How suitable the power and wireless specifications of an active headphone will be, depending on your listening habits. The range and/or discharge time of the active headphone you select will be important if you're often on the move or have long uninterrupted listening sessions.
Score components:

No active features.

0 Wireless
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What it is: Headphones that offer a cable-free listening experience over a wireless network, typically via Bluetooth or radio frequency.
When it matters: If you don't want to be limited by the length of an audio cable. This means having the freedom to move around in your home or office with a much greater range than an audio cable could provide, especially, if the Bluetooth source is heavy or difficult to carry.
Type
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What it is: The type and version of the wireless network, the headphones use to connect to the audio source. This could either be Bluetooth or radio frequency.
When it matters: The Bluetooth version will determine how compatible the headphones are with your Bluetooth enabled devices. Typically, newer Bluetooth versions are backward compatible with older ones but may lack the additional features that more recent Bluetooth protocols provide.
:
N/A
Obstructed Range
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What it is: The range that the wireless headphones can reach before dropping any audio when the Bluetooth source was placed in another room.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in an indoor environment. Although, the obstructed wireless range will slightly depend on your home or office layout.
Good value: >35ft
Noticeable difference: 5ft
:
N/A
Line of Sight Range
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What it is: The range that the wireless headphones can reach before dropping any audio when in direct line of sight of the Bluetooth device.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in a large and open environment.
Good value: 170ft or more
Noticeable difference: 10ft
:
N/A
NFC
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What it is: Near Field Communication technology that allows you to quickly, pair your headphones with your Bluetooth and NFC-enabled device.
When it matters: This makes pairing with an NFC-enabled device a lot easier than the typical and often tedious hold-to-pair procedure that most wireless headphones have.
:
No

0 Battery
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What it is: The power source of your headphones. All headphones with active features have a battery that will deplete over time.
When it matters: To continue using the active features of your headphones. Some models lose features or switch off completely when the battery is drained, which limits what you can do with them until the next charge.
Score components:
Battery Type
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What it is: The type of battery that the headphones use. Usually AAA or embedded, Li-ion rechargeable batteries.
When it matters: When your headphones run out of power. Rechargeable batteries usually charge via the headphones Micro-USB port whereas AAA batteries have to be replaced or charged with an external device.
:
N/A
Battery Life
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What it is: The amount of time it takes for a headphones' battery to be completely drained. Battery life will vary depending on the active features used and volume level.
When it matters: For active headphones that connect wirelessly, have noise cancellation or other audio-enhancing features, that cease to work once the battery is dead.
Good value: >10hrs
Noticeable difference: 0.5hrs
:
0 hrs
Charge Time
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What it is: The amount of time your active headphones have to be connected to a power source to charge from 0 to a 100%. However, charging time will vary depending on your power source.
When it matters: To be able to use the active features of your headphones. Especially, wireless ones that completely switch off and need to be recharged when the battery is dead.
Good value: 2h or less
Noticeable difference: 0.25h
:
N/A
Auto-off
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What it is: A feature that turns off the headphones, after a set time, when they're not in use.
When it matters: To prolong battery life when the headphones are not being used, or if you forget to manually turn off your headphones.
:
N/A
Audio while charging
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What it is: Some active headphones remain usable while charging. They continue to stream audio and do not disable other active features.
When it matters: This makes sure that your headphones's battery are not being drained when your relatively close to a power source. However, this means wireless headphones will need a wired connection to the power source during the charging process.
:
N/A
Passive Playback
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What it is: Active headphones that still work when all their active features are turned off or out of power.
When it matters: If you run out of power and do not have spare AA/AAA batteries or access to a power source to recharge your headphones.
:
N/A

0 App Support
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What it is: The additional app provided to enhance your listening experience. They typically deliver a set of practical features that give you more control over the sound, noise cancelling and effects that the headphones produce.
When it matters: An app with a lot of features allows you to customize your listening experience to suit your taste and preferences. For example, additions like an equalizer can give you more bass or treble and room effects can simulate a bigger Soundstage in closed back headphones.
Score components: Subjectively assigned

No compatible app.

In the box

Koss Porta Pro  In the box Picture

  • Koss Porta Pro KTC Headphones
  • Carrying pouch
  • Manual

Conclusion
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5.8Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
The Koss Porta Pro are not the most versatile headphones. They don't isolate much and leak due to their open design. They're also flimsy and lacking in features, however, they produce a well-balanced sound on par with much more expensive headphones. This makes them a good, budget recommendation for critical listening but they might not be well-suited for other use cases.
7.3Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
The Porta Pro have an unexpectedly, good sound with a deep and rich Bass Range, well-balanced instruments and vocals, and tapered highs that do not sound too sharp. The open design gives them a decent soundstage, and although they won't sound as clear or detailed as some expensive critical listening headphones, their sound quality is more than sufficient for most listeners.
4.5Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
Score components:
Not ideal for commuting. These headphones barely isolate listeners from ambient noise and won't perform well in loud environments.
6.1Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
Score components:
Mediocre at best for sports. They're lightweight, compact and have a moderately decent control scheme. The open design also allows you to monitor your environment. However, they won't be stable enough for intense exercise, and they have a lot of moving parts that can get caught on your hair or clothing.
5.3Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
Subpar for office use. They leak at higher volumes and don't prevent the chatter of a lively office from seeping into your audio.
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Questions & Answers

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Will you be reviewing the Koss KSC75? I understand that they are often purchased as a cheaper (and less stylish) alternative to the Porta Pro, and many say that they have a better sound. It would be nice to see how they compare head to head.
Thanks for your suggestion. We will add them to our list, but it will be low in priority since we have plenty of headphones on our to-do list already.
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