OVERALL
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 E40 BT Review | 93 Data compared

Avg. price:~£25Form factor:on-earConnectivity:wirelessBattery life:16 hoursActive noise cancellation (ANC):no

JBL E40 BT 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 E40 BT
5.8/10

Overall score

Score
5.8/ 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 71% of models
Score components

80%

5.8

Technical score

20%

?

User score

â–¼Worse than 71% of headphones
7.1

Value for money

Value for money
7.1/ 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 67% of models
Score components

70%

5.8

Overall score

30%

10

Price

â–¼Worse than 67%
5.8

Technical score

Technical score
5.8/ 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 52% of models
Score components

52%

6.3

Sound

20%

4.0

Features

10%

7.3

Design

8%

6.3

Connectivity

6%

4.5

Battery

4%

7.1

Calls & Controls

â–¼Worse than 52%
?

User score

User score
8.0/ 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 58% of models
Score components

70%

?

User ratings

30%

?

Number of reviews

Based on ratings from across the web.
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Where to buy
    N/A~ £25
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 E40 BT

Technical score
Technical score
5.8/ 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 52% of models
Score components:

52%

6.3

Sound

20%

4.0

Features

10%

7.3

Design

8%

6.3

Connectivity

6%

4.5

Battery

4%

7.1

Calls & Controls

5.8
User score
User score
8.0/ 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 58% of models
Score components

70%

?

User ratings

30%

?

Number of reviews

Based on ratings from across the web.
?
Popularity
Popularity
1.0/ 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 99% of models
Popularity:
JBL E40 BT has a popularity score of 1 point, which is lower than that of 73.4% of products in this category.
1.0
Value for money
Value for money
7.1/ 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 67% of models
Score components:

70%

5.8

Overall score

30%

10

Price

7.1
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
20 Hz
Market range: <5 Hz – >20 Hz
This pair of headphones reaches a lowest frequency of 20 Hz, higher lowest frequency than 50.8% of headphones and equal to 47.3% 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
no
This pair of headphones does not include a boom microphone. 13.5% of headphones have a boom microphone.
Microphone SNR
?
Show more
Connectivity
wireless
This pair of headphones supports wireless connectivity, more flexible connectivity than 50.8% of headphones and equal to 49.2% of headphones.
Bluetooth version
3
This pair of headphones uses Bluetooth version 3, newer Bluetooth version than 55.5% of headphones and equal to 1.7% of headphones.
Maximum Bluetooth range
10 m
Market range: <10 m – >15 m
This pair of headphones offers a Bluetooth range of 10 m, higher Bluetooth range than 2.7% of headphones and equal to 80.6% of headphones.
Audio latency
?
Multipoint support
yes
This pair of headphones supports multipoint. 69.4% 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
16 hours
Market range: <10 hours – >70 hours
This pair of headphones offers battery life of 16 hours, lower battery life than 77% of headphones and equal to 2.3% of headphones.
Battery life with ANC
N/A
Charging time
3 hours
Market range: <1.5 hours – >3.5 hours
This pair of headphones needs 3 hours to charge, higher charging time than 66.7% of headphones and equal to 20.8% of headphones.
Quick charge
no
This pair of headphones does not support quick charging. 33.1% of headphones support quick charge.
Battery capacity
610 mAh
Market range: <290 mAh – >1k mAh
This pair of headphones has a battery capacity of 610 mAh, higher battery capacity than 58.3% of headphones and equal to 2.7% of headphones.
Show more
Brand name
JBL
Form factor
on-ear
Weight
205 g
Market range: <14 g – >340 g
This pair of headphones weighs 205 g, lighter than 53.3% of headphones and equal to 0.5% of headphones.
Acoustic design
closed-back
Clamp force
?
Show more

JBL E40 BT vs the average pair of headphones

246810TotalDesignSoundBatteryConnectivityCalls & ControlsFeatures
  • Multipoint support
    This pair of headphones supports multipoint, the average pair of headphones does not. 30.6% of headphones support multipoint.
  • 12 dB/mW higher sensitivity
    This pair of headphones has a higher sensitivity than the average pair of headphones (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
    This pair of headphones offers more flexible connectivity than the average pair of headphones (wireless vs wired). The average headphones support wired connectivity.
    wireless vs wired
  • 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.
  • Foldable design
    This pair of headphones has a foldable design, the average pair of headphones does not. 48.3% of headphones are foldable.
  • 3.6x cheaper
    JBL E40 BT is cheaper than the average pair of headphones (£25 vs £90).
    £25 vs £90
  • Rechargeable battery
    This pair of headphones has a rechargeable battery, the average pair of headphones does not. 47.9% of headphones have a rechargeable battery.
  • 3.6x cheaper
    JBL E40 BT is cheaper than the average pair of headphones (£25 vs £90).
    £25 vs £90
  • Foldable design
    This pair of headphones has a foldable design, the average pair of headphones does not. 48.3% of headphones are foldable.
  • 12 dB/mW higher sensitivity
    This pair of headphones has a higher sensitivity than the average pair of headphones (114 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
    114 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
  • 11 dB SPL higher sound pressure level
    This pair of headphones has a higher sound pressure level than the average pair of headphones (114 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
    114 dB SPL vs 103 dB SPL
  • Rechargeable battery
    This pair of headphones has a rechargeable battery, the average pair of headphones does not. 47.9% of headphones have a rechargeable battery.
  • Multipoint support
    This pair of headphones supports multipoint, the average pair of headphones does not. 30.6% of headphones support multipoint.
  • More flexible connectivity
    This pair of headphones offers more flexible connectivity than the average pair of headphones (wireless vs wired). The average headphones support wired connectivity.
    wireless vs wired
  • 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.
  • 1 hours longer charging time
    This pair of headphones has a higher charging time than the average pair of headphones (3 hours vs 2 hours). The average headphones need 2 hours to charge.
    3 hours vs 2 hours
  • 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.
  • 14 hours shorter battery life
    This pair of headphones has a lower battery life than the average pair of headphones (16 hours vs 30 hours). The average headphones offer battery life of 30 hours.
    16 hours vs 30 hours
  • 2 Hz weaker bass extension
    This pair of headphones has a higher lowest frequency than the average pair of headphones (20 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    20 Hz vs 18 Hz
  • 15 mm tighter earcup width
    This pair of headphones has tighter earcup width than the average pair of headphones (29 mm vs 44 mm). The average headphones offer an inner earcup width of 44 mm.
    29 mm vs 44 mm
  • 5.87x less popular
    JBL E40 BT is less popular than the average pair of headphones (1 vs 5.9).
    1 vs 5.87
  • 0.2 % higher distortion
    This pair of headphones has a higher total harmonic distortion than the average pair of headphones (0.5 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
    0.5 % vs 0.3 %
  • 2.5% worse value for money
    JBL E40 BT has worse value for money than the average pair of headphones (7.09 vs 7.3).
    7.09 vs 7.27
  • 5.87x less popular
    JBL E40 BT is less popular than the average pair of headphones (1 vs 5.9).
    1 vs 5.87
  • 2.5% worse value for money
    JBL E40 BT has worse value for money than the average pair of headphones (7.09 vs 7.3).
    7.09 vs 7.27
  • 15 mm tighter earcup width
    This pair of headphones has tighter earcup width than the average pair of headphones (29 mm vs 44 mm). The average headphones offer an inner earcup width of 44 mm.
    29 mm vs 44 mm
  • 2 Hz weaker bass extension
    This pair of headphones has a higher lowest frequency than the average pair of headphones (20 Hz vs 18 Hz). The average headphones reach a lowest frequency of 18 Hz.
    20 Hz vs 18 Hz
  • 0.2 % higher distortion
    This pair of headphones has a higher total harmonic distortion than the average pair of headphones (0.5 % vs 0.3 %). The average headphones have total harmonic distortion of 0.3 %.
    0.5 % vs 0.3 %
  • 1 hours longer charging time
    This pair of headphones has a higher charging time than the average pair of headphones (3 hours vs 2 hours). The average headphones need 2 hours to charge.
    3 hours vs 2 hours
  • 14 hours shorter battery life
    This pair of headphones has a lower battery life than the average pair of headphones (16 hours vs 30 hours). The average headphones offer battery life of 30 hours.
    16 hours vs 30 hours
  • 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.

Video reviews

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

7.8
TechOn
✓ explicit
04/07/2016
Hands-on review · build, sound, comfort and battery tests
Verdict
JBL E40BT is a decent pair with good sound and solid build, best for fans of loud music.
9.0
ELMtree Productions
≈ estimated
14/04/2016
Hands-on review · sound, comfort and battery tests
Verdict
JBL E40BT is a well-liked, recommended pick, despite tinny highs at high volume.
5.0
Gamesky
≈ estimated
18/07/2015
Hands-on review · sound, fit and build tests
Verdict
JBL E40BT is hard to recommend at this price, as better options are available for the money.
9.0
The Next Cool Thing
≈ estimated
22/03/2015
Unboxing and hands-on · sound and noise isolation tests
Verdict
JBL E40BT is recommended, especially for louder workplaces, with clear sound and good noise isolation.
8.0
AG Mobile Tech
≈ estimated
19/09/2014
Hands-on review · sound, comfort and battery tests
Verdict
JBL E40BT is a good affordable pair with excellent battery life, held back by a snug fit and light bass.
Brand video
Hands-on video, no verdict

Third-party reviews

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

What customers like about JBL E40 BT

  • Battery life is stellar, often reaching the advertised 16 hours of continuous playback
  • Balanced sound profile with clear mid-range performance and crisp high tones
  • Unique ShareMe feature allows streaming audio wirelessly to another compatible JBL headset
  • Lightweight and stylish design available in multiple color options
  • Stable Bluetooth connectivity with a respectable range for wireless use
  • On-ear controls are conveniently located for volume and track management

What customers don't like about JBL E40 BT

  • Build quality feels somewhat cheap and fragile due to extensive use of plastic
  • On-ear fit can be overly snug and may cause discomfort during long listening sessions
  • Bass output is often described as lacking punch or being too subtle for bass-heavy genres
  • Charging cable uses a proprietary 2.5mm jack rather than standard micro-USB or USB-C
  • Significant sound leakage occurs at higher volumes, which may disturb people nearby

Verdict

The JBL Synchros E40BT is an on-ear Bluetooth headset featuring 40mm drivers and a wide frequency response of 10Hz to 24kHz. Key characteristics include ShareMe technology for simultaneous wireless audio streaming to another set of headphones and a built-in lithium-ion battery providing up to 16 hours of playback. Main pros include its lightweight, foldable 205g design with 3D swivel hinges, a high sound pressure level of 114dB for loud output, and the inclusion of a detachable aux cable for passive listening when the battery is depleted. However, common cons include a predominantly plastic construction that may feel fragile, reported discomfort during long listening sessions due to ear pressure, and a lack of punchy sub-bass that may disappoint fans of bass-heavy genres.

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