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ALTERNATIVES
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REVIEWS
Scored using Headphones Methodology v1.0
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Products in this category are scored under Frontum Headphones Methodology v1.0: technical specifications plus authentic consumer ratings, with 0% commercial bias.
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JBL Synchros S300 Review | 93 Data compared

Avg. price:~£160Form factor:on-earConnectivity:wiredBattery life:N/A hoursActive noise cancellation (ANC):no

JBL Synchros S300 Review: Compare 93 technical specifications and user reviews to see how this product ranks in the Headphones category and whether it is worth buying.

JBL Synchros S300
6.3/10

Overall score

Score
6.3/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–² Better than 56% of models
Score components

80%

6.2

Technical score

20%

6.9

User score

â–²Better than 56% of headphones
7.3

Value for money

Value for money
7.3/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 51% of models
Score components

70%

6.3

Overall score

30%

9.7

Price

â–¼Worse than 51%
6.2

Technical score

Technical score
6.2/ 10
✕
What it is
An assessment of technical performance for products in the Headphones category across these key areas: Sound, Calls & Controls, Connectivity, Features, Battery, Design.
When it matters
When you want to compare headphones based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 62% of models
Score components

52%

6.5

Sound

20%

5.4

Features

10%

7.7

Design

8%

4.0

Connectivity

6%

5.4

Battery

4%

8.1

Calls & Controls

â–²Better than 62%
6.9

User score

User score
6.9/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 88% of models
Score components

70%

7.6

User ratings

30%

5.2

Number of reviews

Based on ratings from across the web.
â–¼Worse than 88%
  • jbl-synchros-s300
jbl-synchros-s300
Where to buy
*As an Amazon Associate, we earn from qualifying purchases.
Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of pair of headphones JBL Synchros S300

Technical score
Technical score
6.2/ 10
✕
What it is
An assessment of technical performance for products in the Headphones category across these key areas: Sound, Calls & Controls, Connectivity, Features, Battery, Design.
When it matters
When you want to compare headphones based on technical performance and available features.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 62% of models
Score components:

52%

6.5

Sound

20%

5.4

Features

10%

7.7

Design

8%

4.0

Connectivity

6%

5.4

Battery

4%

8.1

Calls & Controls

6.2
User score
User score
6.9/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 88% of models
Score components

70%

7.6

User ratings

30%

5.2

Number of reviews

Based on ratings from across the web.
6.9
Popularity
Popularity
5.2/ 10
✕
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.
Score distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 58% of models
Popularity:
JBL Synchros S300 has a popularity score of 5.2 points, which is lower than that of 56.9% of products in this category.
5.2
Value for money
Value for money
7.3/ 10
✕
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 distribution
â–¼
<55-66-77-88-99-10
â–¼ Worse than 51% of models
Score components:

70%

6.3

Overall score

30%

9.7

Price

7.3
Active noise cancellation (ANC)
no
This pair of headphones does not support active noise cancellation. 27.5% of headphones support active noise cancellation.
Driver type
dynamic
Driver size
40 mm
Market range: <10 mm – >50 mm
This pair of headphones uses a driver size of 40 mm, larger driver size than 28.6% of headphones and equal to 53.3% of headphones.
Number of drivers
1
Market range: <1 – >4
This pair of headphones uses 1 drivers, fewer drivers than 4% of headphones and equal to 96% of headphones.
Lowest frequency
10 Hz
Market range: <5 Hz – >20 Hz
This pair of headphones reaches a lowest frequency of 10 Hz, lower lowest frequency than 67.2% of headphones and equal to 12.6% of headphones.
Show more
Noise-canceling microphone
?
Can be used as a headset
yes
This pair of headphones is headset-ready, 84.8% is not. 15.2% of headphones can be used as headsets.
Number of microphones
1
Market range: <0 – >4
This pair of headphones has 1 microphones, more microphones than 26.9% of headphones and equal to 50.9% of headphones.
Boom microphone
yes
This pair of headphones includes a boom microphone. 86.5% of headphones have a boom microphone.
Microphone SNR
?
Show more
Connectivity
wired
This pair of headphones supports wired connectivity, less flexible connectivity than 49.2% of headphones and equal to 50.8% of headphones.
Bluetooth version
N/A
Maximum Bluetooth range
N/A
Audio latency
N/A
Multipoint support
no
This pair of headphones does not support multipoint. 30.6% of headphones support multipoint.
Show more
Ambient sound mode
no
This pair of headphones does not offer ambient sound mode. 24.9% of headphones support ambient sound mode.
EQ support
yes
This pair of headphones supports EQ customization. 76.8% of headphones support EQ.
Companion app
no
This pair of headphones does not work with a companion app. 21.6% of headphones support companion apps.
Adjustable ANC levels
N/A
Voice assistant support
yes
This pair of headphones supports voice assistants. 39.2% of headphones support voice assistants.
Show more
Battery life
N/A
Battery life with ANC
N/A
Charging time
N/A
Quick charge
no
This pair of headphones does not support quick charging. 33.1% of headphones support quick charge.
Battery capacity
N/A
Show more
Brand name
JBL
Form factor
on-ear
Weight
201.3 g
Market range: <14 g – >340 g
This pair of headphones weighs 201.3 g, lighter than 54.4% of headphones and equal to 0.1% of headphones.
Acoustic design
closed-back
Clamp force
?
Show more

JBL Synchros S300 vs the average pair of headphones

246810TotalDesignSoundBatteryConnectivityCalls & ControlsFeatures
  • EQ customization
    This pair of headphones supports EQ customization, the average pair of headphones does not. 23.2% of headphones support EQ.
  • 13 dB/mW higher sensitivity
    This pair of headphones has a higher sensitivity than the average pair of headphones (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
    This pair of headphones has a lower lowest frequency than the average pair of headphones (10 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    10 Hz vs 18 Hz
  • In-line controls
    This pair of headphones includes in-line controls, the average pair of headphones does not. 36.6% of headphones support in-line controls.
  • Foldable design
    This pair of headphones has a foldable design, the average pair of headphones does not. 48.3% of headphones are foldable.
  • Wind noise reduction
    This pair of headphones reduces wind noise, the average pair of headphones does not. 34.3% of headphones support wind noise reduction.
  • Sidetone support
    This pair of headphones supports sidetone, the average pair of headphones does not. 25.3% of headphones support sidetone.
  • Quick mic mute
    This pair of headphones includes a quick mic mute, the average pair of headphones does not. 29.3% of headphones support a mute function.
  • Foldable design
    This pair of headphones has a foldable design, the average pair of headphones does not. 48.3% of headphones are foldable.
  • 13 dB/mW higher sensitivity
    This pair of headphones has a higher sensitivity than the average pair of headphones (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
    This pair of headphones has a lower lowest frequency than the average pair of headphones (10 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    10 Hz vs 18 Hz
  • 12 dB SPL higher sound pressure level
    This pair of headphones has a higher sound pressure level than the average pair of headphones (115 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
    115 dB SPL vs 103 dB SPL
  • 2,000 Hz higher treble extension
    This pair of headphones has a higher highest frequency than the average pair of headphones (22,000 Hz vs 20,000 Hz). The average headphones reach a highest frequency of 20,000 Hz.
    22,000 Hz vs 20,000 Hz
  • Play while charging
    This pair of headphones can play while charging, the average pair of headphones cannot. 29.1% of headphones support play while charging.
  • In-line controls
    This pair of headphones includes in-line controls, the average pair of headphones does not. 36.6% of headphones support in-line controls.
  • Wind noise reduction
    This pair of headphones reduces wind noise, the average pair of headphones does not. 34.3% of headphones support wind noise reduction.
  • Sidetone support
    This pair of headphones supports sidetone, the average pair of headphones does not. 25.3% of headphones support sidetone.
  • Quick mic mute
    This pair of headphones includes a quick mic mute, the average pair of headphones does not. 29.3% of headphones support a mute function.
  • Boom microphone included
    This pair of headphones includes a boom microphone, the average pair of headphones does not. 13.5% of headphones have a boom microphone.
  • EQ customization
    This pair of headphones supports EQ customization, the average pair of headphones does not. 23.2% of headphones support EQ.
  • 16.5% lower user score
    User score
    6.9/ 10
    ✕
    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 distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    JBL Synchros S300
    the average pair of headphones
    JBL Synchros S300 has a lower user score than the average pair of headphones (6.87 vs 8).
    6.87 vs 8
  • 77.8% more expensive
    JBL Synchros S300 is more expensive than the average pair of headphones (£160 vs £90).
    £160 vs £90
  • 16.5% lower user score
    User score
    6.9/ 10
    ✕
    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 distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    JBL Synchros S300
    the average pair of headphones
    JBL Synchros S300 has a lower user score than the average pair of headphones (6.87 vs 8).
    6.87 vs 8
  • 77.8% more expensive
    JBL Synchros S300 is more expensive than the average pair of headphones (£160 vs £90).
    £160 vs £90

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

9.0
Technology Smash
≈ estimated
01/01/2016
Unboxing · first try-on, no sound test
Verdict
JBL Synchros S300 has a solid build and a comfortable fit, and it is especially recommended for NBA fans.
Not graded yet

Expert reviews

In-depth analysis and verdict from leading tech publications

H
head-fi.org
15/11/2013
Summary of the review
JBL Synchros S300 Premium On-Ear Stereo Headphones
headphone.ph
03/08/2014
Two-week test · Closed-back on-ear
Verdict
The JBL Synchros S300 is a comfortable on-ear that folds for travel and leaks almost no sound, though its isolation is only slightly above average.
consumerreports.org
01/06/2014
Lab test · Closed on-ear headphones
Verdict
The JBL Synchros S300a has good overall sound, but its boomy bass swamps the midrange and the treble is recessed.
I
ilounge.com
07/02/2014
Summary of the review
Review: JBL Synchros S300i Stereo Headphones
unbox.ph
24/03/2014
Hands-on test · Over-ear headphones
Verdict
The JBL Synchros S300 has comfortable soft leather cups and clear, crisp sound, though its bass is less deep than advertised and it can feel tight on large heads.
chip.de
04/12/2015
Hands-on test · Closed on-ear headphones
Verdict
The JBL Synchros S300a sounds warm and balanced with useful features, but its cups press on the head after a while.
lesnumeriques.com
01/07/2014
Lab test · Bass-heavy headphones
Verdict
The JBL Synchros S300 suits electronic and rap fans who want heavy bass, but its muffled treble and lack of airiness make classical and jazz less enjoyable.

Third-party reviews

Based on ratings from across the web.
Reviews last updated: November 2026 · How we calculate this

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 don't like 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

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).

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