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JBL Synchros S300 Review | 93 Data compared

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  • Avg. price in UK: ~£160
  • Avg. price in US: ~$200
  • Form factor: on-ear
  • Connectivity: wired
  • Battery life: N/A hours
  • Active noise cancellation (ANC): no

JBL Synchros S300 review. Compare 93 technical specifications and user reviews to see how it ranks among headphones and if it is worth buying.

5.9

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%

5.8

Technical Score

20.0%

6.4

User score

Good
5.8

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%

5.3

Sound

20.0%

7.3

Features

10.0%

7.5

Design

8.0%

2.9

Connectivity

6.0%

6.0

Battery

4.0%

7.4

Calls & Controls

Good
6.4

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%

7.6

User reviews

30.0%

3.6

Popularity

User score:
United Kingdom
amazon
3.8
(47)
amazon
3.7
(14)
amazon
4.0
(1)
United States
Amazon_logo.png
3.8
(47)
Amazon_logo.png
3.7
(14)
Amazon_logo.png
4.0
(1)

(Reviews last updated: June 2026)

Good
  • 2.8
    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%

    7.0

    Noise-canceling microphone

    8.0%

    0.0

    Battery life

  • 1.3
    Travel

    Score components:

    28.0%

    1.0

    Active noise cancellation (ANC)

    24.0%

    0.0

    Battery life

    18.0%

    5.6

    Weight

    16.0%

    0.0

    Multipoint support

    14.0%

    0.0

    Ambient sound mode

  • 4.4
    Calls

    Score components:

    28.0%

    7.0

    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

  • 3.8
    Workout

    Score components:

    28.0%

    5.6

    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

  • jbl-synchros-s300
jbl-synchros-s300

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 JBL Synchros S300 is a premium on-ear wired headphone featuring a durable steel headband, die-cast aluminium ear capsules, and soft leather cushions for extended comfort. It is equipped with 40mm drivers that deliver a frequency response range of 10Hz to 22kHz, a sensitivity of 115dB/mW, and 32 Ohms impedance. A primary characteristic is its PureBass performance, which provides deep, balanced audio modeled after professional JBL club systems. Key pros include a highly portable 3D-rotational folding design, a detachable cable with an in-line three-button remote/mic (available in iOS or universal variants), and effective passive noise isolation. However, some users note cons such as a slightly recessed midrange due to the heavy bass emphasis and the lack of active noise cancellation (ANC).

Technical Specifications of JBL Synchros S300

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%

5.3

Sound

20.0%

7.3

Features

10.0%

7.5

Design

8.0%

2.9

Connectivity

6.0%

6.0

Battery

4.0%

7.4

Calls & Controls

5.8
JBL Synchros S300 has a technical score of 5.83 points, which is higher than that of 70.6% 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%

7.6

User reviews

30.0%

3.6

Popularity

User score:
United Kingdom
amazon
3.8
(47)
amazon
3.7
(14)
amazon
4.0
(1)
United States
Amazon_logo.png
3.8
(47)
Amazon_logo.png
3.7
(14)
Amazon_logo.png
4.0
(1)

(Reviews last updated: June 2026)

6.4
JBL Synchros S300 has a user score of 6.37 points, which is lower than that of 88.9% 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.
3.6
JBL Synchros S300 has a popularity of 3.6 points, which is lower than 56.1% 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%

5.9

Overall score

40.0%

9.7

Price

7.1
JBL Synchros S300 has a quality-to-price ratio of 7.1 points, which is higher than 65.7% 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
JBL Synchros S300 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
JBL Synchros S300 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
JBL Synchros S300 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
JBL Synchros S300 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

?
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
JBL Synchros S300 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

1
JBL Synchros S300 has 1 microphones, more microphones than 25.9% of headphones and equal to 52.2% 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

yes
JBL Synchros S300 includes a boom microphone. 84.5% 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

?
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
JBL Synchros S300 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

yes
JBL Synchros S300 supports EQ customization. 76.8% 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

yes
JBL Synchros S300 supports voice assistants. 39.2% 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

JBL
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

on-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

201.3 g
JBL Synchros S300 weighs 201.3 g, lighter than 54.4% of headphones and equal to 0.1% 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

JBL Synchros S300 vs the average headphone

  • EQ customization
    JBL Synchros S300 supports EQ customization, the average headphone does not. 23.3% of headphones support EQ.
    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

    JBL Synchros S300 supports EQ customization, the average headphone does not. 23.3% of headphones support EQ.
  • 13 dB/mW higher sensitivity
    JBL Synchros S300 has a higher sensitivity than the average headphone (115 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

    JBL Synchros S300 has a higher sensitivity than the average headphone (115 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.115 dB/mW vs 102 dB/mW
  • 8 Hz lower bass extension
    JBL Synchros S300 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

    JBL Synchros S300 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
  • In-line controls
    JBL Synchros S300 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
    What it is: Controls available on in-line remote of wired cable
    When it matters: When your wired setup depends on cable-mounted buttons or call controls.

    Importance: LOW

    JBL Synchros S300 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
  • Wind noise reduction
    JBL Synchros S300 reduces wind noise, the average headphone does not. 34.1% of headphones support wind noise reduction.
    What it is: Reduces wind interference for clearer outdoor calls
    When it matters: When you take calls outdoors while walking, cycling, or commuting.

    Importance: LOW

    JBL Synchros S300 reduces wind noise, the average headphone does not. 34.1% of headphones support wind noise reduction.
  • Foldable design
    JBL Synchros S300 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

    JBL Synchros S300 has a foldable design, the average headphone does not. 61% of headphones are foldable.
  • Sidetone support
    JBL Synchros S300 supports sidetone, the average headphone does not. 29.7% of headphones support sidetone.
    What it is: Lets users hear their own voice during calls
    When it matters: When long calls matter and you do not want to sound unnaturally loud in your own ears while speaking.

    Importance: LOW

    JBL Synchros S300 supports sidetone, the average headphone does not. 29.7% of headphones support sidetone.
  • Quick mic mute
    JBL Synchros S300 includes a quick mic mute, the average headphone does not. 33.5% of headphones support a mute function.
    What it is: Ability to mute microphone during calls
    When it matters: When you need to silence the mic quickly during meetings or multiplayer games.

    Importance: LOW

    JBL Synchros S300 includes a quick mic mute, the average headphone does not. 33.5% of headphones support a mute function.
  • Foldable design
    JBL Synchros S300 has a foldable design, the average headphone does not. 61% of headphones are foldable.
  • 13 dB/mW higher sensitivity
    JBL Synchros S300 has a higher sensitivity than the average headphone (115 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
  • 8 Hz lower bass extension
    JBL Synchros S300 has a lower lowest frequency than the average headphone (10 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
  • 2,000 Hz higher treble extension
    JBL Synchros S300 has a higher highest frequency than the average headphone (22,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
  • 12 dB SPL higher sound pressure level
    JBL Synchros S300 has a higher sound pressure level than the average headphone (115 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
  • Play while charging
    JBL Synchros S300 can play while charging, the average headphone cannot. 55.9% of headphones support play while charging.
  • In-line controls
    JBL Synchros S300 includes in-line controls, the average headphone does not. 36.4% of headphones support in-line controls.
  • Wind noise reduction
    JBL Synchros S300 reduces wind noise, the average headphone does not. 34.1% of headphones support wind noise reduction.
  • Sidetone support
    JBL Synchros S300 supports sidetone, the average headphone does not. 29.7% of headphones support sidetone.
  • Quick mic mute
    JBL Synchros S300 includes a quick mic mute, the average headphone does not. 33.5% of headphones support a mute function.
  • Boom microphone included
    JBL Synchros S300 includes a boom microphone, the average headphone does not. 15.6% of headphones have a boom microphone.
  • EQ customization
    JBL Synchros S300 supports EQ customization, the average headphone does not. 23.3% of headphones support EQ.

Total
Design
Sound
Battery
Calls & Controls
Features
  • 4 years older release date
    JBL Synchros S300 was released earlier than the average headphone (2,013 vs 2,017). The average headphones were released in 2,017.
    November 2013
  • 25.7% lower user score
    JBL Synchros S300 has a lower user score than the average headphone (6.37 vs 8.000).
    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.
    JBL Synchros S300 has a lower user score than the average headphone (6.37 vs 8.000).6.37 vs 8
  • 77.8% more expensive
    JBL Synchros S300 is more expensive than the average headphone (£160 vs £90).
    JBL Synchros S300 is more expensive than the average headphone (£160 vs £90).£160 vs £90
  • 4 years older release date
    JBL Synchros S300 was released earlier than the average headphone (2,013 vs 2,017). The average headphones were released in 2,017.
    November 2013
    What it is: Official release or launch date of the model
    When it matters: When you want a newer model for fresher features, longer support life, or simply to avoid buying into an older generation.

    Importance: LOW

    Good value: >=2020

    JBL Synchros S300 was released earlier than the average headphone (2,013 vs 2,017). The average headphones were released in 2,017.2013 vs 2017
Total
Overall
Features

Graphic comparison of JBL Synchros S300 and

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Third-party reviews

United Kingdom
amazon
3.8
47 Reviews
amazon
3.7
14 Reviews
amazon
4.0
1 Reviews
United States
Amazon_logo.png
3.8
47 Reviews
Amazon_logo.png
3.7
14 Reviews
Amazon_logo.png
4.0
1 Reviews

(Reviews last updated: June 2026)

What customers like about JBL Synchros S300?

  • Powerful bass response with JBL PureBass performance
  • Sturdy and durable build quality featuring a steel headband
  • Soft leather ear cushions provide high comfort levels for long listening sessions
  • Portable design that rotates and folds flat for easy storage
  • Excellent sound clarity across mids and highs
  • Includes a detachable cable with an in-line remote and microphone
  • Minimal sound leakage due to the sealed on-ear design

What customers dislike about JBL Synchros S300?

  • Passive noise isolation is only average and may not block all background noise
  • The in-line remote can feel flimsy or 'cheap' compared to the rest of the build
  • Inline controls are positioned very close to the ear cups (about 5 inches away), making them hard to see
  • On-ear fit may be uncomfortable for users wearing glasses
  • The audio cable is thin and can feel less premium than the headphones themselves

Expert reviews

U
unbox.ph
24/03/2014
JBL Synchros S300i Review: Premium Cans for Your iPhone

The JBL Synchros S300i is lauded for delivering exceptional, distortion-free sound via 40mm drivers, featuring clear mids and crisp highs that justify its premium positioning. While the proprietary PureBass technology is capable, it is less overwhelming than marketed; additionally, the design offers great versatility with a fully functional iOS in-line remote. The headset features a...Read more

I
ilounge.com
07/02/2014
Review: JBL Synchros S300i Stereo Headphones

The JBL Synchros S300i is a wired stereo headphone model that shares its basic design and audio performance with the brand's wireless S400BT, but cuts the original retail price in half to $150 by removing Bluetooth functionality. The design features a padded steel headband with 12 steps of adjustability, soft padded cushions on circular plasticky earcups, and an included zippered...Read more

C
consumerreports.org
01/06/2014
JBL by Harman Synchros S300a Headphone Review

The JBL by Harman Synchros S300a is a portable, closed-back on-ear wired headphone offering a warm sound profile and high sensitivity for good volume on mobile devices. Designed for convenience, the headphones feature folding earcups, a protective case, and a 48-inch detachable cable with an inline microphone for calls and media control. However, the headset suffers from unbalanced,...Read more

H
headphone.ph
03/08/2014
JBL S300 Basshead Headphone Review

The JBL S300 is a striking, well-built on-ear headphone that caters to users who love deep bass. It is made mostly of plastic, but the parts feel sturdy with no creaks or weak points. The headphone features very soft, cushy earpads that conform comfortably to the ears. It also folds up neatly and comes with a nice semi-hard carry case for travel. Another major pro is the clear...Read more

H
head-fi.org
15/11/2013
JBL Synchros S300 Premium On-Ear Stereo Headphones

The Head-Fi review highlights the JBL Synchros S300 as a high-performing on-ear, closed-back headphone, featuring a fun, V-shaped sound with tightly controlled, deep bass and a surprisingly wide soundstage for its class. Pro-level features include a robust, portable design utilizing metal for the headband and yokes, alongside being easy to drive, which delivers excellent value,...Read more

C
chip.de
04/12/2015
JBL Synchros S300a Headphones Review

The JBL Synchros S300a is an elegant, test-winning headphone model featuring a sturdy alloyed metal housing instead of the cheap plastic construction common among its competitors. The audio performance is highly impressive across multiple genres, thanks to its 40mm drivers and a closed-back design that delivers a warm, present bass, excellent spatiality, and a well-balanced sound....Read more

(Translated)Show original
L
lesnumeriques.com
01/07/2014
JBL Synchros S300 Review: Big, Heavy-Hitting Bass", "JBL Synchros S300 Test: Massive Bass That Packs a Punch

The JBL Synchros S300 is a closed-back, supra-aural headphone designed with a distinct "car tuning" aesthetic, featuring a robust and highly flexible mechanical steel headband and molded metal earcups. Weighing 201 grams, the headphones feature thick, well-padded ear cushions that provide reasonable sound isolation and strong comfort, though the light clamping force compromises...Read more

(Translated)Show original

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