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ALTERNATIVES
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REVIEWS
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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 E40 BT Review | 93 Data compared

Avg. price:~£80Form factor:on-earConnectivity:wirelessBattery life:16 hoursActive noise cancellation (ANC):no

JBL Synchros 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 Synchros E40 BT
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 55% of models
Score components

80%

5.9

Technical score

20%

8.0

User score

â–²Better than 55% of headphones
7.4

Value for money

Value for money
7.4/ 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–² Better than 56% of models
Score components

70%

6.3

Overall score

30%

10

Price

â–²Better than 56%
5.9

Technical score

Technical score
5.9/ 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 50% of models
Score components

52%

6.2

Sound

20%

4.4

Features

10%

6.9

Design

8%

5.8

Connectivity

6%

4.5

Battery

4%

8.1

Calls & Controls

â–²Better than 50%
8.0

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%

8.0

User ratings

30%

8.0

Number of reviews

â–¼Worse than 58%
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  • jbl-synchros-e40-bt
  • jbl-synchros-e40-bt
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Where to buy
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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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Headphones model ranking

Ranked #632 of 1,029 models in Headphones (Overall score)

Technical Specifications of pair of headphones JBL Synchros E40 BT

Technical score
Technical score
5.9/ 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 50% of models
Score components:

52%

6.2

Sound

20%

4.4

Features

10%

6.9

Design

8%

5.8

Connectivity

6%

4.5

Battery

4%

8.1

Calls & Controls

5.9
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%

8.0

User ratings

30%

8.0

Number of reviews

8.0
Popularity
Popularity
8.0/ 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–² Better than 77% of models
Popularity:
JBL Synchros E40 BT has a popularity score of 8 points, which is higher than that of 76.6% of products in this category.
8.0
Value for money
Value for money
7.4/ 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–² Better than 56% of models
Score components:

70%

6.3

Overall score

30%

10

Price

7.4
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
yes
This pair of headphones supports a noise-canceling microphone. 61.1% 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
?
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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
15 m
Market range: <10 m – >15 m
This pair of headphones offers a Bluetooth range of 15 m, higher Bluetooth range than 84.9% of headphones and equal to 6.2% of headphones.
Audio latency
180 ms
Market range: <40 ms – >222 ms
This pair of headphones has audio latency of 180 ms, higher audio latency than 64.2% of headphones and equal to 2.9% of headphones.
Multipoint support
yes
This pair of headphones supports multipoint. 69.4% of headphones support multipoint.
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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
yes
This pair of headphones supports voice assistants. 39.2% 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 Synchros 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
  • Clear call microphone
    This pair of headphones offers a clear call microphone, while the average pair of headphones does not. 39% of headphones support noise-canceling microphones.
  • 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.
  • 5 m longer Bluetooth range
    This pair of headphones has a higher Bluetooth range than the average pair of headphones (15 m vs 10 m). The average headphones offer a Bluetooth range of 10 m.
    15 m vs 10 m
  • Foldable design
    This pair of headphones has a foldable design, the average pair of headphones does not. 48.3% of headphones are foldable.
  • 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.
  • 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
  • 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.
  • 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
  • 5 m longer Bluetooth range
    This pair of headphones has a higher Bluetooth range than the average pair of headphones (15 m vs 10 m). The average headphones offer a Bluetooth range of 10 m.
    15 m vs 10 m
  • NFC pairing
    This pair of headphones supports NFC pairing, the average pair of headphones does not. 11.7% of headphones support NFC pairing.
  • Multipoint connections
    This pair of headphones supports multipoint connections, while the average pair of headphones does not. 30.2% of headphones support multipoint connections.
    supports multipoint for up to 2 devices.
  • Clear call microphone
    This pair of headphones offers a clear call microphone, while the average pair of headphones does not. 39% of headphones support noise-canceling microphones.
  • 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.
  • 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.
  • 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
  • 31 mm tighter earcup height
    This pair of headphones has tighter earcup height than the average pair of headphones (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
    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
  • 30 ms higher audio latency
    This pair of headphones has a higher audio latency than the average pair of headphones (180 ms vs 150 ms). The average headphones have audio latency of 150 ms.
    180 ms vs 150 ms
  • Tangle-prone cable
    This pair of headphones uses a tangle-prone cable, while the average pair of headphones is easier to manage. 64.2% of headphones use a tangle-free cable.
    no tangle-free listening cable is present or specified.
  • 31 mm tighter earcup height
    This pair of headphones has tighter earcup height than the average pair of headphones (29 mm vs 60 mm). The average headphones offer an inner earcup height of 60 mm.
    29 mm vs 60 mm
  • 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
  • Tangle-prone cable
    This pair of headphones uses a tangle-prone cable, while the average pair of headphones is easier to manage. 64.2% of headphones use a tangle-free cable.
    no tangle-free listening cable is present or specified.
  • 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
  • 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
  • 30 ms higher audio latency
    This pair of headphones has a higher audio latency than the average pair of headphones (180 ms vs 150 ms). The average headphones have audio latency of 150 ms.
    180 ms vs 150 ms

Third-party reviews

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 don't like 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

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.

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