OVERALL
SPECS
VS AVERAGE
REVIEWS
ALTERNATIVES

JBL Synchros E40 BT Review | 93 Data compared

double-arrow
  • Avg. price in UK: ~£80
  • Avg. price in US: ~$100
  • Form factor: on-ear
  • Connectivity: wireless
  • Battery life: 16 hours
  • Active noise cancellation (ANC): no

JBL Synchros E40 BT review. Compare 93 technical specifications and user reviews to see how it ranks among headphones and if it is worth buying.

5.4

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%

4.6

Technical Score

20.0%

8.6

User score

Good
4.6

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%

4.8

Sound

20.0%

2.7

Features

10.0%

6.8

Design

8.0%

4.2

Connectivity

6.0%

3.9

Battery

4.0%

7.4

Calls & Controls

Poor
8.6

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%

8.0

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.0
(912)
United States
Amazon_logo.png
4.0
(912)

(Reviews last updated: June 2026)

Excellent
  • 5.0
    Gaming

    Score components:

    35.0%

    4.0

    Audio latency

    25.0%

    1.0

    Low-latency game mode

    20.0%

    10

    Can be used as a headset

    12.0%

    10

    Noise-canceling microphone

    8.0%

    2.4

    Battery life

  • 3.4
    Travel

    Score components:

    28.0%

    1.0

    Active noise cancellation (ANC)

    24.0%

    2.4

    Battery life

    18.0%

    5.5

    Weight

    16.0%

    10

    Multipoint support

    14.0%

    0.0

    Ambient sound mode

  • 7.5
    Calls

    Score components:

    28.0%

    10

    Noise-canceling microphone

    24.0%

    10

    Can be used as a headset

    18.0%

    10

    Multipoint support

    16.0%

    2.4

    Battery life

    14.0%

    1.0

    Companion app

  • 4.2
    Workout

    Score components:

    28.0%

    5.5

    Weight

    24.0%

    1.0

    Water resistance

    20.0%

    4.0

    IP rating

    16.0%

    2.4

    Battery life

    12.0%

    10

    Can be used as a headset

  • jbl-synchros-e40-bt
  • jbl-synchros-e40-bt
  • jbl-synchros-e40-bt
jbl-synchros-e40-bt
jbl-synchros-e40-bt
jbl-synchros-e40-bt

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 E40BT is a portable on-ear wireless headset featuring 40mm premium drivers and JBL's signature sound with PureBass performance, delivering a broad frequency response of 10Hz to 24kHz. Key characteristics include Bluetooth 3.0 connectivity, an ergonomic headband with 3D aluminum swivel hinges for a personalized fit, and unique ShareMe technology that allows simultaneous wireless music streaming to another compatible set of headphones. Its internal lithium-ion battery provides up to 16 hours of music playback and 24 hours of talk time, supported by a built-in microphone with Pure Konnexx echo-cancellation for clear hands-free calls. Main pros include its lightweight 205g design, the inclusion of a detachable aux cable for passive listening when the battery is depleted, and effective passive noise isolation from leatherette ear cushions. However, some users have noted cons such as a primarily plastic construction that can feel fragile, potential discomfort or ear pressure during long listening sessions, and a proprietary charging cable that is not standard micro-USB.

Technical Specifications of JBL Synchros E40 BT

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%

4.8

Sound

20.0%

2.7

Features

10.0%

6.8

Design

8.0%

4.2

Connectivity

6.0%

3.9

Battery

4.0%

7.4

Calls & Controls

4.6
JBL Synchros E40 BT has a technical score of 4.56 points, which is lower than that of 68.5% 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%

8.0

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.0
(912)
United States
Amazon_logo.png
4.0
(912)

(Reviews last updated: June 2026)

8.6
JBL Synchros E40 BT has a user score of 8.6 points, which is higher than that of 73.7% 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.
10
JBL Synchros E40 BT has a popularity of 10 points, which is higher than 71.9% 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%

5.4

Overall score

40.0%

10

Price

6.8
JBL Synchros E40 BT has a quality-to-price ratio of 6.8 points, which is higher than 51% 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 E40 BT 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 E40 BT 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 E40 BT 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

20 Hz
JBL Synchros E40 BT reaches a lowest frequency of 20 Hz, higher lowest frequency than 50.6% of headphones and equal to 47.5% 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

yes
JBL Synchros E40 BT supports a noise-canceling microphone. 54.5% 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
JBL Synchros E40 BT 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 E40 BT 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

no
JBL Synchros E40 BT 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

?
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

wireless
JBL Synchros E40 BT supports wireless connectivity, more flexible connectivity than 52.6% of headphones and equal to 47.4% of headphones.
supports both wireless and wired connectivity.
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

3.0
JBL Synchros E40 BT uses Bluetooth version 3.0, newer Bluetooth version than 55.7% of headphones and equal to 1.6% of headphones.
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

15 m
JBL Synchros E40 BT offers a Bluetooth range of 15 m, higher Bluetooth range than 84.2% of headphones and equal to 6.2% of headphones.
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

180 ms
JBL Synchros E40 BT has audio latency of 180 ms, higher audio latency than 64.4% of headphones and equal to 2.8% of headphones.
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

yes
JBL Synchros E40 BT supports multipoint. 35% of headphones support multipoint.
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
JBL Synchros E40 BT 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

no
JBL Synchros E40 BT does not work with a companion app. 44.4% of headphones support companion apps.
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 E40 BT 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

16 hours
JBL Synchros E40 BT offers battery life of 16 hours, lower battery life than 77.3% of headphones and equal to 2.4% of headphones.
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

3 hours
JBL Synchros E40 BT needs 3 hours to charge, higher charging time than 66% of headphones and equal to 21.3% of headphones.
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

no
JBL Synchros E40 BT does not support quick charging. 69.1% of headphones support quick charge.
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

610 mAh
JBL Synchros E40 BT has a battery capacity of 610 mAh, higher battery capacity than 57% of headphones and equal to 3% of headphones.
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

205 g
JBL Synchros E40 BT weighs 205 g, lighter than 53.4% of headphones and equal to 0.5% 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 E40 BT vs the average headphone

  • 12 dB/mW higher sensitivity
    JBL Synchros E40 BT has a higher sensitivity than the average headphone (114 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 E40 BT has a higher sensitivity than the average headphone (114 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.114 dB/mW vs 102 dB/mW
  • More flexible connectivity
    JBL Synchros E40 BT offers more flexible connectivity than the average headphone (wireless vs wired). The average headphones support wired connectivity.
    supports both wireless and wired 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

    JBL Synchros E40 BT offers more flexible connectivity than the average headphone (wireless vs wired). The average headphones support wired connectivity.wireless vs wired
  • Clear call microphone
    JBL Synchros E40 BT offers a clear call microphone, while the average headphone does not. 45.6% of headphones support noise-canceling microphones.
    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

    JBL Synchros E40 BT offers a clear call microphone, while the average headphone does not. 45.6% of headphones support noise-canceling microphones.
  • On-device controls
    JBL Synchros E40 BT includes on-device controls, the average headphone does not. 46.8% of headphones support on-device controls.
    What it is: Physical controls available directly on headphones
    When it matters: When you need playback, volume, or call controls to be easy to reach without pulling out your phone.

    Importance: MEDIUM

    JBL Synchros E40 BT includes on-device controls, the average headphone does not. 46.8% of headphones support on-device controls.
  • 5 m longer Bluetooth range
    JBL Synchros E40 BT has a higher Bluetooth range than the average headphone (15 m vs 10 m). The average headphones offer a Bluetooth range of 10 m.
    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

    JBL Synchros E40 BT has a higher Bluetooth range than the average headphone (15 m vs 10 m). The average headphones offer a Bluetooth range of 10 m.15 m vs 10 m
  • Foldable design
    JBL Synchros E40 BT 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 E40 BT has a foldable design, the average headphone does not. 61% of headphones are foldable.
  • Quick mic mute
    JBL Synchros E40 BT 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 E40 BT includes a quick mic mute, the average headphone does not. 33.5% of headphones support a mute function.
  • Rechargeable battery
    JBL Synchros E40 BT has a rechargeable battery, the average headphone does not. 47.9% of headphones have a rechargeable battery.
    What it is: Shows whether the headphones rely on an internal rechargeable battery instead of replaceable disposable cells.
    When it matters: When you expect regular wireless use and want charging convenience instead of buying and replacing disposable batteries.

    Importance: MEDIUM

    JBL Synchros E40 BT has a rechargeable battery, the average headphone does not. 47.9% of headphones have a rechargeable battery.
  • Foldable design
    JBL Synchros E40 BT has a foldable design, the average headphone does not. 61% of headphones are foldable.
  • 12 dB/mW higher sensitivity
    JBL Synchros E40 BT has a higher sensitivity than the average headphone (114 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
  • 2,000 Hz higher treble extension
    JBL Synchros E40 BT 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.
  • 11 dB SPL higher sound pressure level
    JBL Synchros E40 BT has a higher sound pressure level than the average headphone (114 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
  • Rechargeable battery
    JBL Synchros E40 BT has a rechargeable battery, the average headphone does not. 47.9% of headphones have a rechargeable battery.
  • Play while charging
    JBL Synchros E40 BT can play while charging, the average headphone cannot. 55.9% of headphones support play while charging.
  • More flexible connectivity
    JBL Synchros E40 BT offers more flexible connectivity than the average headphone (wireless vs wired). The average headphones support wired connectivity.
  • 5 m longer Bluetooth range
    JBL Synchros E40 BT has a higher Bluetooth range than the average headphone (15 m vs 10 m). The average headphones offer a Bluetooth range of 10 m.
  • Clear call microphone
    JBL Synchros E40 BT offers a clear call microphone, while the average headphone does not. 45.6% of headphones support noise-canceling microphones.
  • On-device controls
    JBL Synchros E40 BT includes on-device controls, the average headphone does not. 46.8% of headphones support on-device controls.
  • Quick mic mute
    JBL Synchros E40 BT includes a quick mic mute, the average headphone does not. 33.5% of headphones support a mute function.

Total
Overall
Design
Sound
Battery
Connectivity
Calls & Controls
  • 31 mm tighter earcup height
    JBL Synchros E40 BT has tighter earcup height than the average headphone (29 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
  • 14 mm tighter earcup width
    JBL Synchros E40 BT has tighter earcup width than the average headphone (29 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.
  • Tangle-prone cable
    JBL Synchros E40 BT uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
    no tangle-free listening cable is present or specified.
  • No travel bag
    JBL Synchros E40 BT does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
  • 2 Hz weaker bass extension
    JBL Synchros E40 BT has a higher lowest frequency than the average headphone (20 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
  • 1 hours longer charging time
    JBL Synchros E40 BT has a higher charging time than the average headphone (3 hours vs 2 hours). The average headphones need 2 hours to charge.
  • 14 hours shorter battery life
    JBL Synchros E40 BT has a lower battery life than the average headphone (16 hours vs 30 hours). The average headphones offer battery life of 30 hours.
  • 52.5 ms higher audio latency
    JBL Synchros E40 BT has a higher audio latency than the average headphone (180 ms vs 127.5 ms). The average headphones have audio latency of 127.5 ms.
  • 1 hours longer charging time
    JBL Synchros E40 BT has a higher charging time than the average headphone (3 hours vs 2 hours). The average headphones need 2 hours to charge.
    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

    JBL Synchros E40 BT has a higher charging time than the average headphone (3 hours vs 2 hours). The average headphones need 2 hours to charge.3 hours vs 2 hours
  • 31 mm tighter earcup height
    JBL Synchros E40 BT has tighter earcup height than the average headphone (29 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
    What it is: Internal height of the earcup cavity
    When it matters: When larger ears need enough space inside the earcups.

    Importance: MEDIUM

    JBL Synchros E40 BT has tighter earcup height than the average headphone (29 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.29 mm vs 60 mm
  • 14 hours shorter battery life
    JBL Synchros E40 BT has a lower battery life than the average headphone (16 hours vs 30 hours). The average headphones offer battery life of 30 hours.
    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

    JBL Synchros E40 BT has a lower battery life than the average headphone (16 hours vs 30 hours). The average headphones offer battery life of 30 hours.16 hours vs 30 hours
  • 52.5 ms higher audio latency
    JBL Synchros E40 BT has a higher audio latency than the average headphone (180 ms vs 127.5 ms). The average headphones have audio latency of 127.5 ms.
    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

    JBL Synchros E40 BT has a higher audio latency than the average headphone (180 ms vs 127.5 ms). The average headphones have audio latency of 127.5 ms.180 ms vs 127.5 ms
  • 2 Hz weaker bass extension
    JBL Synchros E40 BT has a higher lowest frequency than the average headphone (20 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 E40 BT has a higher lowest frequency than the average headphone (20 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.20 Hz vs 18 Hz
  • 14 mm tighter earcup width
    JBL Synchros E40 BT has tighter earcup width than the average headphone (29 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.
    What it is: Internal width of the earcup cavity
    When it matters: When earcup fit affects comfort and pressure around your ears.

    Importance: MEDIUM

    JBL Synchros E40 BT has tighter earcup width than the average headphone (29 mm vs 43 mm). The average headphones offer an inner earcup width of 43 mm.29 mm vs 43 mm
  • Tangle-prone cable
    JBL Synchros E40 BT uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
    no tangle-free listening cable is present or specified.
    What it is: Cable designed to resist tangling
    When it matters: When you often carry wired headphones in a bag or pocket.

    Importance: LOW

    JBL Synchros E40 BT uses a tangle-prone cable, while the average headphone is easier to manage. 64.2% of headphones use a tangle-free cable.
  • No travel bag
    JBL Synchros E40 BT does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
    What it is: Comes with a protective carrying case or pouch
    When it matters: When protection in transit matters right out of the box.

    Importance: LOW

    JBL Synchros E40 BT does not include a travel bag, the average headphone does. 65.2% of headphones include a travel bag.
Total
Design
Sound
Battery
Connectivity

Graphic comparison of JBL Synchros E40 BT and

Attribute category
Attribute
No results found

Third-party reviews

United Kingdom
amazon
4.0
912 Reviews
United States
Amazon_logo.png
4.0
912 Reviews

(Reviews last updated: June 2026)

What customers like about JBL Synchros E40 BT?

  • Excellent value for the price, often cited as a high-quality affordable option
  • Strong battery life, lasting approximately 16 hours on a single charge
  • Lightweight and portable design with 3D folding hinges for easy storage
  • Clear, punchy sound with good performance in the mid and high ranges
  • Unique ShareMe feature that allows wireless music streaming to another compatible JBL headset
  • Stable Bluetooth connectivity with a surprisingly large range

What customers dislike about JBL Synchros E40 BT?

  • Poor build quality reported by many users, specifically regarding fragile plastic hinges and headbands prone to snapping
  • Uncomfortable for long listening sessions due to a tight, rigid fit that puts pressure on the ears
  • Lacks deep bass, which may disappoint fans of hip-hop or bass-heavy music
  • Cumbersome control scheme; buttons can be difficult to use accurately
  • Proprietary charging cable that uses a 2.5mm jack instead of standard micro-USB or USB-C
  • Poor noise isolation in noisy environments despite having some passive insulation

Expert reviews

L
letemsvetemapplem.eu
10/04/2016
JBL Synchros E40BT Review: Small Headphones with Big Sound

The JBL Synchros E40BTGo are compact, lightweight, wireless headphones featuring a closed design with comfortable textile cushions, although the stiff plastic headband may initially cause pressure for users with larger ears. They offer a high-quality build and deliver balanced, clear sound, characterized by strong treble for vocals and, while not heavily bass-driven, sufficient bass...Read more

I
ilounge.com
19/05/2021
Review: JBL Synchros E40BT On-Ear Headphones - iLounge

The JBL Synchros E40BT is a mid-range entry in the Synchros E series, retailing for $100 and offering both Bluetooth and wired connectivity. Designed as an on-ear alternative to the larger E50BT, it features 40mm drivers and a lightweight build composed primarily of plastic with metal accents and leatherette cushions. Testers found the headphones surprisingly comfortable for an...Read more

T
techwelike.com
15/07/2014
JBL Synchros E40BT Wireless Headphones Review

The JBL Synchros E40BT wireless on-ear headphones offer a playful, youth-oriented design featuring a red matte plastic body accented by silver details and a metallic logo. Priced at $99.95, they deliver high-value performance backed by JBL's signature full-spectrum sound, providing loud, clear audio with balanced highs, mids, and lows. Setup is highly intuitive via a simple...Read more

G
geekdad.com
25/08/2014
Product Review: JBL Synchros E40BT Bluetooth Headphones

The JBL Synchros E40BT is an over-ear wireless Bluetooth headset designed for long-term comfort, particularly in office or commuter settings. A standout feature is the "ShareMe" technology, which allows users to stream music directly to another pair of ShareMe-enabled headphones. The device boasts a solid 16-hour battery life for music and up to 25 hours for talk time, with the...Read more

T
techradar.com
18/09/2014
JBL Synchros E40BT review - TechRadar

Conversely, the review points out several drawbacks (cons) regarding the hardware's physical design and audio balance. A main complaint is the rigid, tight on-ear fit; because the cups are fixed in place on a 3D hinge with no moldable "give," they sit too snug against the ears and require frequent adjusting during long listening sessions. The build quality is also described as...Read more

K
kopfhoerer.de
21/03/2016
JBL Synchros E40BT im Test bei kopfhoerer.de

The JBL Synchros E40BT is a lightweight, on-ear Bluetooth headphone evaluated at a street price of 90 Euros, offering a compact and cohesive sound profile characterized by a strong bass foundation and well-defined upper-mids. On the positive side, the headphones feature a comfortable 199-gram design, an integrated microphone with PureKonnexx noise reduction for clear hands-free...Read more

(Translated)Show original
S
sonntagmorgen.com
01/07/2026
JBL E40BT Wireless Review 2026 - Sunday Morning

The JBL E40BT wireless headphones offer a lightweight, highly mobile design with mixed everyday performance, according to the review by Sonntagmorgen. Priced at €119.90, this 200-gram on-ear model features convenient folding and rotating earcups for space-saving storage, alongside a solid 16-hour battery life and an included auxiliary cable for wired backup. The build quality is...Read more

(Translated)Show original
0
01net.com
10/06/2014
Review: JBL Synchros E40BT, a cheap but uncomfortable Bluetooth headset

The JBL Synchros E40BT is an affordable, entry-level on-ear Bluetooth headset made mostly of plastic that offers practical mobility features but compromises heavily on long-term comfort. On the positive side, it boasts a highly impressive battery life of nearly 20 hours, a lightweight design, and the ability to rotate the earcups 90 degrees to lay flat for easy transportation. It...Read more

(Translated)Show original
M
m.alatest.fr
01/07/2026
JBL Synchros E40 BT | Review, Tests, and Price", "JBL Synchros E40 BT | Reviews, Testing, and Pricing

The JBL Synchros E40BT is an affordable on-ear wireless headset featuring ShareMe technology for audio sharing and solid 16-hour battery life, though it lacks robust bass. While providing clear mid-range sound and a detachable wired option, the design is limited by a lightweight yet fragile plastic build. The tight, rigid headband can cause discomfort during long sessions, and the...Read more

(Translated)Show original
A
audiocasque.fr
16/10/2014
JBL E40BT | REVIEW | Stylish and high-performing for under 100

The JBL Synchros E40BT is an affordable, on-ear wireless Bluetooth 3.0 headphone priced under €100 that balances modern style with highly functional features. Winning the prestigious Red Dot design award in 2014, it stands out for its high-quality plastic body, soft faux-leather ear cushions, and compact 90-degree rotating ear cups. The left ear cup centralizes all controls,...Read more

(Translated)Show original
T
tweakers.net
06/04/2016
JBL Synchros E40BT Black - Stranger__NL - Product reviews

The JBL Synchros E40BT is rated poorly (2/5 stars) by a user on Tweakers due to a unusable microphone, despite offering exceptional battery life, decent audio quality for standard music, and versatile wired/wireless connectivity. Critical flaws include a microphone that makes voice calls impossible and a USB connection limited to charging, preventing its use as a digital audio...Read more

(Translated)Show original

Video reviews

Best alternatives

moondrop-edge
Moondrop Edge

Headphones

7.9
jbl-tune-680nc
JBL Tune 680NC

Headphones

8.2
creative-sound-blaster
Creative Sound Blaster

Headphones

7.7
jbl-tune-670nc
JBL Tune 670NC

Headphones

8.1
jlab-go-lux-anc
JLab Go Lux ANC

Headphones

8.4
jbl-live-460nc
JBL Live 460NC

Headphones

7.9
skullcandy-icon-anc
Skullcandy Icon ANC

Headphones

7.0
jbl-live-670nc
JBL Live 670NC

Headphones

8.7
phiaton-bonobeats-lite
Phiaton Bonobeats Lite

Headphones

7.8
marshall-major-v
Marshall Major V

Headphones

6.7
akg-y45bt
AKG Y45bt

Headphones

6.5
pioneer-s6
Pioneer S6

Headphones

6.8

Compare JBL Synchros E40 BT with

VS
VS

Compare