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ALTERNATIVES
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JBL Synchros S100 Review | 93 Data compared

Avg. price:~£45Form factor:in-earConnectivity:wiredBattery life:N/A hoursActive noise cancellation (ANC):no

JBL Synchros S100 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 S100
5.5/10

Overall score

Score
5.5/ 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–¼ Worse than 87% of models
Score components

80%

5.3

Technical score

20%

6.2

User score

â–¼Worse than 87% of headphones
6.8

Value for money

Value for money
6.8/ 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 84% of models
Score components

70%

5.5

Overall score

30%

10

Price

â–¼Worse than 84%
5.3

Technical score

Technical score
5.3/ 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–¼ Worse than 83% of models
Score components

52%

5.7

Sound

20%

4.0

Features

10%

6.2

Design

8%

4.6

Connectivity

6%

4.0

Battery

4%

7.7

Calls & Controls

â–¼Worse than 83%
6.2

User score

User score
6.2/ 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 95% of models
Score components

70%

6.9

User ratings

30%

4.7

Number of reviews

Based on ratings from across the web.
â–¼Worse than 95%
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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 S100

Technical score
Technical score
5.3/ 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–¼ Worse than 83% of models
Score components:

52%

5.7

Sound

20%

4.0

Features

10%

6.2

Design

8%

4.6

Connectivity

6%

4.0

Battery

4%

7.7

Calls & Controls

5.3
User score
User score
6.2/ 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 95% of models
Score components

70%

6.9

User ratings

30%

4.7

Number of reviews

Based on ratings from across the web.
6.2
Popularity
Popularity
4.7/ 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 62% of models
Popularity:
JBL Synchros S100 has a popularity score of 4.7 points, which is lower than that of 61% of products in this category.
4.7
Value for money
Value for money
6.8/ 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 84% of models
Score components:

70%

5.5

Overall score

30%

10

Price

6.8
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
9 mm
Market range: <10 mm – >50 mm
This pair of headphones uses a driver size of 9 mm, smaller driver size than 92.3% of headphones and equal to 2.6% 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
no
This pair of headphones does not support a noise-canceling microphone. 39% of headphones support noise-canceling microphones.
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
no
This pair of headphones does not support EQ customization. 23.2% 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
no
This pair of headphones does not support voice assistants. 60.9% 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
in-ear
Weight
?
Acoustic design
closed-back
Clamp force
N/A
Show more

JBL Synchros S100 vs the average pair of headphones

246810TotalDesignSoundBatteryConnectivityCalls & ControlsFeatures
  • 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
  • Direct 3.5 mm plug
    This pair of headphones includes a direct 3.5 mm plug, the average pair of headphones does not. 39.8% of headphones have a 3.5 mm male connector.
  • On-device controls
    This pair of headphones includes on-device controls, the average pair of headphones does not. 46.8% of headphones support on-device controls.
  • 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.
  • 4 dB/mW higher sensitivity
    This pair of headphones has a higher sensitivity than the average pair of headphones (106 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    106 dB/mW vs 102 dB/mW
  • 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.
  • 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
  • 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
  • 4 dB/mW higher sensitivity
    This pair of headphones has a higher sensitivity than the average pair of headphones (106 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    106 dB/mW vs 102 dB/mW
  • 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
  • Direct 3.5 mm plug
    This pair of headphones includes a direct 3.5 mm plug, the average pair of headphones does not. 39.8% of headphones have a 3.5 mm male connector.
  • On-device controls
    This pair of headphones includes on-device controls, the average pair of headphones does not. 46.8% of headphones support on-device controls.
  • 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.
  • 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.
  • 31 mm smaller driver size
    This pair of headphones has smaller driver size than the average pair of headphones (9 mm vs 40 mm). The average headphones use a driver size of 40 mm.
    9 mm vs 40 mm
  • Non-replaceable earpads
    This pair of headphones has non-replaceable earpads, while the average pair of headphones has replaceable ones. 75.6% of headphones have replaceable earpads.
  • No voice assistant support
    This pair of headphones does not support voice assistants, the average pair of headphones does. 60.8% of headphones support voice assistants.
  • Fixed cable
    This pair of headphones has a fixed cable, while the average pair of headphones has a detachable one. 62% of headphones have a detachable cable.
  • 28.1% lower user score
    User score
    6.2/ 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 S100
    the average pair of headphones
    JBL Synchros S100 has a lower user score than the average pair of headphones (6.25 vs 8).
    6.25 vs 8
  • No battery indicator
    This pair of headphones does not show battery level clearly, while the average pair of headphones does. 56.3% of headphones have a battery level indicator.
  • 6.1% worse value for money
    JBL Synchros S100 has worse value for money than the average pair of headphones (6.85 vs 7.3).
    6.85 vs 7.27
  • 95% lower input power handling
    This pair of headphones has a lower max input power than the average pair of headphones (5 mW vs 100 mW). The average headphones handle max input power of 100 mW.
    5 mW vs 100 mW
  • 28.1% lower user score
    User score
    6.2/ 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 S100
    the average pair of headphones
    JBL Synchros S100 has a lower user score than the average pair of headphones (6.25 vs 8).
    6.25 vs 8
  • 6.1% worse value for money
    JBL Synchros S100 has worse value for money than the average pair of headphones (6.85 vs 7.3).
    6.85 vs 7.27
  • Non-replaceable earpads
    This pair of headphones has non-replaceable earpads, while the average pair of headphones has replaceable ones. 75.6% of headphones have replaceable earpads.
  • Fixed cable
    This pair of headphones has a fixed cable, while the average pair of headphones has a detachable one. 62% of headphones have a detachable cable.
  • 31 mm smaller driver size
    This pair of headphones has smaller driver size than the average pair of headphones (9 mm vs 40 mm). The average headphones use a driver size of 40 mm.
    9 mm vs 40 mm
  • 95% lower input power handling
    This pair of headphones has a lower max input power than the average pair of headphones (5 mW vs 100 mW). The average headphones handle max input power of 100 mW.
    5 mW vs 100 mW
  • No battery indicator
    This pair of headphones does not show battery level clearly, while the average pair of headphones does. 56.3% of headphones have a battery level indicator.
  • No voice assistant support
    This pair of headphones does not support voice assistants, the average pair of headphones does. 60.8% of headphones support voice assistants.

Expert reviews

In-depth analysis and verdict from leading tech publications

pcmag.com
20/02/2014
Hands-on review · Bass-heavy in-ear
Verdict
The JBL Synchros S100a is a bass lover's in-ear with subwoofer-like lows that don't distort, but it is too heavy on lows for balanced listening.
uk.pcmag.com
19/02/2014
Listening test · Bass-focused in-ear
Verdict
The JBL Synchros S100i is a bass lover's in-ear with strong, distortion-free lows, though its balance leans too far toward bass for accurate listening.
au.pcmag.com
19/02/2014
Listening review · Bass-focused in-ear
Verdict
The JBL Synchros S100a suits bass fans who want subwoofer-like lows, but its low end overpowers the highs for anyone who values balance.
headphone.ph
27/04/2014
Hands-on review · Build and fit
Verdict
The JBL Synchros S100a is a well-built in-ear with a hard case, but weak isolation and a heavy housing make it less comfortable for sleeping.
C
consumerreports.org
Undated
Summary of the review
JBL by Harman Synchros S100a Headphone Review
kopfhoerer.de
09/01/2016
Listening test · Android in-ear
Verdict
The JBL Synchros S100a is an average in-ear that sounds fine but not outstanding, so price should decide; it's only worth buying at a clear discount.

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 S100

  • Powerful, deep bass performance without distortion even at high volumes
  • High sensitivity allows for satisfying volume levels on lower-powered devices
  • Premium build with die-cast aluminium earpieces and metal accents
  • Tangle-free flat cable design for better management
  • Generous accessory package including Comply foam ear tips and a carrying case
  • Effective noise reduction from the earplug-like design when using foam tips

What customers don't like about JBL Synchros S100

  • Sound signature is not ideal for purists due to recessed treble and boosted bass
  • Can produce a sense of pressure in the ear opening that may be uncomfortable for some
  • Below average passive noise isolation compared to some other in-ear monitors
  • Driver housing is somewhat heavy and thick, which can lead to a shallow fit
  • Remote control compatibility is split between specific iOS and Android models
  • Lacks active noise cancellation (ANC)

Verdict

The JBL Synchros S100 is an advanced in-ear headphone featuring ultra-light, die-cast aluminum construction and a precision-made 9mm driver that delivers a frequency response of 10Hz to 22kHz with a maximum SPL of 106dB. Its main characteristics include JBL PureBass performance for deep, powerful lows, angled ear tips for a stable fit, and a tangle-resistant flat cable available in configurations for both iOS and Android devices. Main pros include a premium build with metal accents, the inclusion of Comply foam tips for superior isolation, and a distortion-free audio experience even at high volumes. However, some cons include below-average passive noise isolation and a shallow insertion depth that may make it difficult for some users to achieve a perfect seal depending on their ear canal shape.

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