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Koss PRO4s Review | 93 Data compared

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  • Avg. price in UK: ~£110
  • Avg. price in US: ~$100
  • Form factor: over-ear
  • Connectivity: wired
  • Battery life: N/A hours
  • Active noise cancellation (ANC): no

Koss PRO4s review. Compare 93 technical specifications and user reviews to see how it ranks among headphones and if it is worth buying.

5.2

Overall score

What it is: An overall evaluation of the headphones' quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best headphones on the market.

Score components:

80.0%

4.3

Technical Score

20.0%

8.4

User score

Good
4.3

Technical Score

What it is: An assessment of the headphones' technical performance, covering key areas such as sound quality, noise cancelling, microphone performance, battery life, comfort, connectivity, features, and build quality.

When it matters: When you want to compare headphones based on technical performance and available features.

Score components:

52.0%

5.1

Sound

20.0%

2.7

Features

10.0%

7.6

Design

8.0%

2.9

Connectivity

6.0%

1.0

Battery

4.0%

2.8

Calls & Controls

Poor
8.4

User score

What it is: A rating that combines user reviews and the total number of reviews received by the headphones.

When it matters: When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.

Score components:

70.0%

8.4

User reviews

30.0%

8.5

Popularity

User score:
United Kingdom
amazon
4.2
(397)
amazon
4.2
(44)
United States
Amazon_logo.png
4.2
(397)
Amazon_logo.png
4.2
(44)

(Reviews last updated: June 2026)

Excellent
  • 2.1
    Gaming

    Score components:

    35.0%

    0.0

    Audio latency

    25.0%

    0.0

    Low-latency game mode

    20.0%

    10

    Can be used as a headset

    12.0%

    1.0

    Noise-canceling microphone

    8.0%

    0.0

    Battery life

  • 1.4
    Travel

    Score components:

    28.0%

    1.0

    Active noise cancellation (ANC)

    24.0%

    0.0

    Battery life

    18.0%

    6.1

    Weight

    16.0%

    0.0

    Multipoint support

    14.0%

    0.0

    Ambient sound mode

  • 2.7
    Calls

    Score components:

    28.0%

    1.0

    Noise-canceling microphone

    24.0%

    10

    Can be used as a headset

    18.0%

    0.0

    Multipoint support

    16.0%

    0.0

    Battery life

    14.0%

    0.0

    Companion app

  • 3.9
    Workout

    Score components:

    28.0%

    6.1

    Weight

    24.0%

    1.0

    Water resistance

    20.0%

    4.0

    IP rating

    16.0%

    0.0

    Battery life

    12.0%

    10

    Can be used as a headset

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Best prices in UK

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The Koss Pro4S is a closed-back studio monitor headphone featuring a frequency response of 10–25,000 Hz, 35 Ohm impedance, and 99 dB SPL sensitivity. Its professional-grade construction includes an integrated metal-on-metal assembly with aluminum earcups and ergonomic D-profile memory foam cushions for improved sealing and comfort. Key performance features include the SLX40 reference-tuned element for unbiased sound and a dual-choice entry system that allows for daisy-chaining and pass-through listening via a detachable 1.4m coiled cord. Main pros include its exceptionally lightweight design, fold-flat portability with an included hardshell case, and Koss's iconic limited lifetime warranty. However, some users note cons such as a conservative sub-bass response, occasional harshness in the higher mids, and the lack of an integrated microphone or in-line remote for smartphone use.

Technical Specifications of Koss PRO4s

Technical Score

What it is: An assessment of the headphones' technical performance, covering key areas such as sound quality, noise cancelling, microphone performance, battery life, comfort, connectivity, features, and build quality.

When it matters: When you want to compare headphones based on technical performance and available features.

Score components:

52.0%

5.1

Sound

20.0%

2.7

Features

10.0%

7.6

Design

8.0%

2.9

Connectivity

6.0%

1.0

Battery

4.0%

2.8

Calls & Controls

4.3
Koss PRO4s has a technical score of 4.34 points, which is lower than that of 80% of products in this category.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the headphones.

When it matters: When you want to understand how headphones perform in real listening and how reliable they are in terms of comfort, audio quality, battery life, and long-term use.

Score components:

70.0%

8.4

User reviews

30.0%

8.5

Popularity

User score:
United Kingdom
amazon
4.2
(397)
amazon
4.2
(44)
United States
Amazon_logo.png
4.2
(397)
Amazon_logo.png
4.2
(44)

(Reviews last updated: June 2026)

8.4
Koss PRO4s has a user score of 8.43 points, which is higher than that of 70.8% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by the headphones.
When it matters: When you prefer headphones that have already been chosen and reviewed by many other users.
8.5
Koss PRO4s has a popularity of 8.5 points, which is higher than 67.5% of products in this category.
Ratio quality/price

What it is: An indicator that combines the headphones' overall rating with their cost.

When it matters: When you are looking for headphones that offer a strong balance of performance, features, and price.

Score components:

60.0%

5.2

Overall score

40.0%

9.9

Price

6.6
Koss PRO4s has a quality-to-price ratio of 6.6 points, which is lower than 54.9% of products in this category.
Active noise cancellation (ANC)
What it is: Reduces background noise using active technology
When it matters: When blocking office, travel, or aircraft noise is a priority.

Importance: HIGH

no
Koss PRO4s does not support active noise cancellation. 27.4% of headphones support active noise cancellation.
Driver type
What it is: Type of speaker driver technology used
When it matters: When the underlying sound character and driver technology matter to you.

Importance: MEDIUM

dynamic
Driver size
What it is: Diameter of the speaker driver unit
When it matters: When you want extra hardware context behind how the headphones may handle bass weight, scale, or overall presentation.

Importance: MEDIUM

40 mm
Koss PRO4s uses a driver size of 40 mm, larger driver size than 28.2% of headphones and equal to 53.6% of headphones.
Number of drivers
What it is: Total number of speaker drivers per earcup
When it matters: When multi-driver designs are part of your buying criteria.

Importance: LOW

1
Koss PRO4s uses 1 drivers, equal to 96% of headphones.
Lowest frequency
What it is: Lowest audio frequency the headphones can reproduce
When it matters: When deeper bass extension matters for your music or movie listening.

Importance: MEDIUM

Good value: <=10 Hz

10 Hz
Koss PRO4s reaches a lowest frequency of 10 Hz, lower lowest frequency than 67.3% of headphones and equal to 12.5% of headphones.
Show more
Noise-canceling microphone
What it is: Built-in microphone reduces background noise during calls
When it matters: When you take calls in busy spaces and want your voice to stay clearer.

Importance: MEDIUM

no
Koss PRO4s does not support a noise-canceling microphone. 45.6% of headphones support noise-canceling microphones.
Can be used as a headset
What it is: Shows whether the headphones can handle voice chat and calls in addition to normal audio playback.
When it matters: When one pair needs to cover music, calls, meetings, and gaming chat.

Importance: MEDIUM

yes
Koss PRO4s is headset-ready, 84.7% is not. 15.3% of headphones can be used as headsets.
Number of microphones
What it is: Total number of built-in microphones
When it matters: When call pickup quality and beamforming support matter to you.

Importance: LOW

Good value: >=2

0
Koss PRO4s has 0 microphones, fewer microphones than 74.1% of headphones and equal to 25.9% of headphones.
Boom microphone
What it is: Includes detachable boom microphone for voice clarity
When it matters: When you need stronger voice clarity for gaming, streaming, or work calls.

Importance: LOW

no
Koss PRO4s does not include a boom microphone. 15.6% of headphones have a boom microphone.
Microphone SNR
What it is: Signal-to-noise ratio of the microphone
When it matters: When call clarity matters and you want your voice picked up more cleanly instead of buried in background hiss.

Importance: LOW

Good value: >80 dB

N/A
Show more
Connectivity
What it is: Available connection methods (wired, wireless, Bluetooth, etc.)
When it matters: When the headphones need to match how you listen across wired and wireless devices.

Importance: HIGH

wired
Koss PRO4s supports wired connectivity, equal to 52.6% of headphones.
Bluetooth version
What it is: Version of Bluetooth technology supported
When it matters: When wireless stability, efficiency, and feature support matter more than treating Bluetooth as a box-check spec.

Importance: MEDIUM

Good value: >=5.0

N/A
Maximum Bluetooth range
What it is: Maximum wireless operating distance from source device
When it matters: When you move around rooms and want fewer dropouts from your source device.

Importance: LOW

Good value: >=10 m

N/A
Audio latency
What it is: Delay between audio and video in wireless mode
When it matters: When you watch video or play games and need sound to stay in sync.

Importance: HIGH

Good value: <60 ms

N/A
Multipoint support
What it is: Supports simultaneous connections to multiple devices
When it matters: When you switch often between a phone and a laptop during the day.

Importance: MEDIUM

N/A
Show more
Ambient sound mode
What it is: Allows external sounds to pass through for awareness
When it matters: When you need to stay aware of traffic, voices, or announcements.

Importance: MEDIUM

N/A
EQ support
What it is: Allows customization of sound profile via equalizer
When it matters: When the stock tuning is not enough and you want to shape bass, mids, or treble to match your taste.

Importance: MEDIUM

no
Koss PRO4s does not support EQ customization. 23.3% of headphones support EQ.
Companion app
What it is: Dedicated mobile app for customization and updates
When it matters: When software customization, updates, and extra controls matter.

Importance: MEDIUM

N/A
Adjustable ANC levels
What it is: Allows adjustment of noise cancellation intensity levels
When it matters: When you move between quiet rooms, offices, streets, and public transport and do not want one ANC setting for every situation.

Importance: LOW

Good value: >=4

N/A
Voice assistant support
What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant
When it matters: When hands-free control is part of your daily routine.

Importance: LOW

no
Koss PRO4s does not support voice assistants. 60.9% of headphones support voice assistants.
Show more
Battery life
What it is: Playback time on a single charge
When it matters: When you commute, travel, or work long shifts and do not want charging breaks to interrupt listening.

Importance: HIGH

Good value: >45 hours

N/A
Battery life with ANC
What it is: Playback time with active noise cancellation enabled
When it matters: When you plan to keep noise cancellation on for most of the day.

Importance: HIGH

Good value: >40 hours

N/A
Charging time
What it is: Time required for a full battery charge
When it matters: When you often need the headphones ready again after short breaks.

Importance: MEDIUM

Good value: <=2 hours

N/A
Quick charge
What it is: Provides quick playback time with short charging period
When it matters: When a short top-up needs to deliver useful playback before you leave.

Importance: MEDIUM

N/A
Battery capacity
What it is: Total energy storage of the internal battery
When it matters: When you are estimating how much battery headroom the design may have before relying only on the official runtime claim.

Importance: MEDIUM

Good value: >=720 mAh

N/A
Show more
Brand name
What it is: The manufacturer or brand of the product.
When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

Koss
Form factor
What it is: Overall design type of the headphones (over-ear, on-ear, in-ear, etc.)
When it matters: When comfort, portability, and isolation depend on the overall headphone style.

Importance: HIGH

over-ear
Weight
What it is: Total weight of the headphones
When it matters: When long listening sessions make wearing comfort more important.

Importance: MEDIUM

Good value: <150 g

181 g
Koss PRO4s weighs 181 g, lighter than 61.3% of headphones and equal to 0.3% of headphones.
Acoustic design
What it is: Type of acoustic design (open-back, closed-back, semi-open)
When it matters: When you need the right balance of isolation, leakage, and soundstage.

Importance: HIGH

closed-back
Clamp force
What it is: Amount of clamping pressure applied to the head
When it matters: When comfort and fit security matter during long sessions.

Importance: MEDIUM

?
Show more

Koss PRO4s vs the average headphone

  • 8 Hz lower bass extension
    Koss PRO4s has a lower lowest frequency than the average headphone (10 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    What it is: Lowest audio frequency the headphones can reproduce
    When it matters: When deeper bass extension matters for your music or movie listening.

    Importance: MEDIUM

    Good value: <=10 Hz

    Koss PRO4s has a lower lowest frequency than the average headphone (10 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.10 Hz vs 18 Hz
  • Foldable design
    Koss PRO4s has a foldable design, the average headphone does not. 61% of headphones are foldable.
    What it is: Earcups or headband can fold for compact storage
    When it matters: When you travel often and want easier storage in a bag.

    Importance: LOW

    Koss PRO4s has a foldable design, the average headphone does not. 61% of headphones are foldable.
  • 5,000 Hz higher treble extension
    Koss PRO4s has a higher highest frequency than the average headphone (25,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
    What it is: Highest audio frequency the headphones can reproduce
    When it matters: When treble extension and overall frequency reach matter to you.

    Importance: MEDIUM

    Good value: >=24000 Hz

    Koss PRO4s has a higher highest frequency than the average headphone (25,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.25000 Hz vs 20000 Hz
  • 17% lower weight
    Koss PRO4s is lighter than the average headphone (181 g vs 218 g). The average pair of headphones weighs 218 g.
    What it is: Total weight of the headphones
    When it matters: When long listening sessions make wearing comfort more important.

    Importance: MEDIUM

    Good value: <150 g

    Koss PRO4s is lighter than the average headphone (181 g vs 218 g). The average pair of headphones weighs 218 g.181 g vs 218 g
  • Foldable design
    Koss PRO4s has a foldable design, the average headphone does not. 61% of headphones are foldable.
  • 17% lower weight
    Koss PRO4s is lighter than the average headphone (181 g vs 218 g). The average pair of headphones weighs 218 g.
  • 8 Hz lower bass extension
    Koss PRO4s has a lower lowest frequency than the average headphone (10 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
  • 5,000 Hz higher treble extension
    Koss PRO4s has a higher highest frequency than the average headphone (25,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.

Total
Design
Sound
  • 3 dB/mW lower sensitivity
    Koss PRO4s has a lower sensitivity than the average headphone (99 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
  • 1 fewer microphones
    Koss PRO4s has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.
  • No voice assistant support
    Koss PRO4s does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
  • No voice assistant support
    Koss PRO4s does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
    What it is: Compatible with voice assistants like Siri, Alexa, or Google Assistant
    When it matters: When hands-free control is part of your daily routine.

    Importance: LOW

    Koss PRO4s does not support voice assistants, the average headphone does. 60.8% of headphones support voice assistants.
  • 3 dB/mW lower sensitivity
    Koss PRO4s has a lower sensitivity than the average headphone (99 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    What it is: Sound pressure output level per unit of input power
    When it matters: When you plan to use weaker sources like phones, handhelds, or entry-level dongles and still want enough volume.

    Importance: MEDIUM

    Good value: >=106 dB/mW

    Koss PRO4s has a lower sensitivity than the average headphone (99 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.99 dB/mW vs 102 dB/mW
  • 1 fewer microphones
    Koss PRO4s has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.
    What it is: Total number of built-in microphones
    When it matters: When call pickup quality and beamforming support matter to you.

    Importance: LOW

    Good value: >=2

    Koss PRO4s has fewer microphones than the average headphone (0 vs 1). The average headphones have 1 microphones.0 vs 1
Total
Sound
Calls & Controls
Features

Graphic comparison of Koss PRO4s and

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Third-party reviews

United Kingdom
amazon
4.2
397 Reviews
amazon
4.2
44 Reviews
United States
Amazon_logo.png
4.2
397 Reviews
Amazon_logo.png
4.2
44 Reviews

(Reviews last updated: June 2026)

What customers like about Koss PRO4s?

  • Neutral and accurate sound signature ideal for studio monitoring and professional mixing
  • Iconic D-profile earcup design mimics the ear shape for a natural fit and consistent seal
  • Rugged build with aluminum earcups and metal-on-metal assembly
  • Koss's celebrated no-questions-asked lifetime warranty
  • Dual-choice entry with 3.5mm jacks on both earcups allowing for flexible cable placement and daisy-chaining
  • Lightweight and portable design that includes a high-quality hardshell carrying case

What customers dislike about Koss PRO4s?

  • Relatively high clamping force can cause discomfort or 'ear marks' during long listening sessions
  • Flat, clinical sound may lack excitement for casual listening or bass-heavy genres
  • Reported quality control issues with internal soldering on the input jacks causing channel cutout
  • Sub-bass response is conservative and can distort if pushed heavily with EQ
  • Stock coiled cable lacks an in-line microphone or remote for smartphone use
  • Limited soundstage depth compared to open-back models or some competitors like the Beyerdynamic DT 770

Expert reviews

H
head-fi.org
24/11/2014
Koss Pro4S Full Size Studio Headphones Review

The Koss Pro4SGo is highlighted as a sturdy, comfortable studio headphone featuring metal ear cups, memory foam padding, and a "D-shape" cup design for an ergonomic fit, according to a Head-Fi review. It offers a warm sound profile with punchy bass and a rich midrange, along with practical features like dual-entry cabling and a lifetime warranty. Conversely, the review notes a...Read more

M
marinij.com
12/10/2015
Sound Advice: Classic Koss headphones good, but modern version even better

The Koss Pro4AAGo ($99) offers vintage styling with a durable build, solid bass, and excellent noise isolation, yet suffers from significant weight, discomfort, and a need for high power to drive properly. While offering a neutral sound, its outdated design, thick cable, and lack of transparency make it less ideal for modern, portable use, according to the review. Marin Independent...Read more

D
dirtroadprincesscom.wordpress.com
08/07/2017
Koss Pro4S Headphones – A Review Video Reviews & First Looks

The Koss Pro4S over-ear headphones are highly praised by the reviewer as a durable, comfortable, and portable upgrade from lower-end models like the Koss UR23iK. Designed with Koss's signature "D profile" shape, they offer exceptional comfort for long casual listening sessions, even for users who wear glasses. Key strengths include their robust build quality featuring a mix of metal...Read more

T
theaudiobeat.com
04/08/2015
Koss Pro4S Headphones

The Koss Pro4S ($149.99) is an over-the-ear, closed-back headphone model designed with a modern, lightweight 6.9-ounce frame. It features Koss's unique D-profile ear cups for an improved ear fit, metal hinges for durability, and a detachable coiled cord that can plug into either ear cup to allow for pass-through daisy-chain listening. The headphones offer excellent passive noise...Read more

S
soundandvision.com
26/06/2015
Koss Pro4S Headphone Review

The Sound & Vision review of the $150 Koss Pro4S highlights a modern, comfortable design featuring cast-aluminum ear cups and a timbrally rich, warm sound that avoids fatigue on compressed tracks. While offering impressive clarity and an open soundstage, the headphones are noted for lacking an inline microphone and phone controls, limiting their convenience for mobile use. Despite...Read more

X
xander51.medium.com
14/05/2021
Koss Pro4S Studio Headphones Review

Alex Rowe's Medium review highlights the Koss Pro4S studio headphones as durable, comfortable, and accurate, making them an excellent budget-friendly choice. Key pros include a robust build with metal components, an iconic "D-profile" design that offers superior comfort and passive noise isolation, and a premium hard case. Medium· However, the review notes a few cons, specifically a...Read more

T
thephonograph.net
16/08/2018
Koss Pro4S - Review | ThePhonograph.net

ThePhonograph.net review of the Koss Pro4S highlights a highly capable studio monitor headphone with premium packaging and accessories, earning a perfect score for its included hard case and detachable cable. Sonically, the Pro4S offers a fun, punchy mid-bass with a warm, clear midrange, featuring crisp upper mids and pleasant, detailed treble. ThePhonograph.netHowever, the headset...Read more

T
techradar.com
18/02/2015
Koss Pro4S review

The Koss Pro4S are lightweight, over-ear studio headphones priced affordably at $149. Designed for portability and comfort, they feature a sleek look with aluminum earcups utilizing a unique "D-profile" shape that fits naturally around the human ear. The build features flexible metal hinges that allow the earcups to swivel 180 degrees and fold neatly into the padded leather headband...Read more

C
cnet.com
13/04/2015
Koss Pro4S review: Lightweight studio monitor headphones for engineers, producers and attentive audiophiles

utility, featuring dual-entry jacks that allow users to connect the included coiled cable to either side; the vacant jack can then act as an audio pass-through for daisy-chaining another set of headphones. Additionally, Koss provides outstanding value through its renowned, hassle-free lifetime warranty that guarantees a brand-new replacement pair for a small shipping fee if they...Read more

D
digitec.ch
15/05/2019
Reviews for Koss Pro4S (Wired) - digitec.ch

The Koss Pro4S Studio Over-Ear HeadphonesGo offer a highly specialized, neutral, and crisp sound signature ideal for audio tracking, featuring ergonomic D-shaped ear cups and a unique dual-entry cable system. These lightweight, durable, and foldable headphones also include a hard case and a lifetime warranty. However, the "true neutral" audio lacks artificial bass boost, which may...Read more

(Translated)Show original
A
audiovision.de
20/12/2022
Koss Pro4S (Review) - audiovision

The Koss Pro4S is a €170 studio-focused, wired over-ear headphone tailored specifically for audio engineers and producers looking for clinical precision rather than an embellished, bass-heavy musical experience. Weighing an incredibly light 210 grams, it features soft memory foam ear cushions, a dezentralized padded headband with adjustable metal rails, and horizontally rotating...Read more

(Translated)Show original

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