Boult Audio Flex Review | 93 Data compared
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Boult Audio Flex Review | 93 Data compared

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  • Avg. price: ~£25
  • Form factor: over-ear
  • Connectivity: wireless
  • Battery life: 65 hours
  • Active noise cancellation (ANC): no

Boult Audio Flex review. Compare 93 technical specifications and user reviews to see how this product ranks in the Headphones category and whether it is worth buying.

7.0

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%

6.6

Technical Score

20.0%

8.4

User score

Very good
6.6

Technical Score

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 components:

52.0%

6.3

Sound

20.0%

6.1

Features

10.0%

7.3

Design

8.0%

6.9

Connectivity

6.0%

9.5

Battery

4.0%

8.3

Calls & Controls

Good
8.4

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%

7.7

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
3.9
(14356)
amazon
3.8
(5837)
amazon
3.7
(233)
amazon
2.5
(45)
United States
Amazon_logo.png
3.9
(14356)
Amazon_logo.png
3.8
(5837)
Amazon_logo.png
3.7
(233)
Amazon_logo.png
2.5
(45)

(Reviews last updated: June 2026)

Excellent
  • 9.1
    Gaming

    Score components:

    35.0%

    ?

    Audio latency

    25.0%

    10

    Low-latency game mode

    20.0%

    10

    Can be used as a headset

    12.0%

    10

    Noise-canceling microphone

    8.0%

    ?

    Battery life

  • 7.5
    Travel

    Score components:

    28.0%

    4.0

    Active noise cancellation (ANC)

    24.0%

    ?

    Battery life

    18.0%

    ?

    Weight

    16.0%

    10

    Multipoint support

    14.0%

    10

    Ambient sound mode

  • 8.8
    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%

    ?

    Battery life

    14.0%

    4.0

    Companion app

  • 8.7
    Workout

    Score components:

    28.0%

    ?

    Weight

    24.0%

    10

    Water resistance

    20.0%

    ?

    IP rating

    16.0%

    ?

    Battery life

    12.0%

    10

    Can be used as a headset

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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 Boult Audio Flex is an over-ear wireless headphone featuring 40mm bass drivers, Bluetooth 5.4 connectivity, and a versatile 'Dual Mode' that allows for both wireless and 3.5mm AUX wired listening. It is equipped with Zen™ ENC microphone technology for clearer calls, 4 customizable EQ modes (Bass, Rock, Pop, Vocal), and an IPX5 water resistance rating, while offering an impressive battery life of up to 80 hours with Type-C fast charging. Key pros include its exceptional playtime, lightweight 205g foldable design for portability, and ultra-low 60ms latency for gaming; however, some users have noted cons such as potentially tight clamping force that may cause discomfort during extended wear and a lack of active noise cancellation (ANC), relying instead on passive isolation.

Technical Specifications of pair of headphones Boult Audio Flex

Technical Score

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 components:

52.0%

6.3

Sound

20.0%

6.1

Features

10.0%

7.3

Design

8.0%

6.9

Connectivity

6.0%

9.5

Battery

4.0%

8.3

Calls & Controls

6.6
Boult Audio Flex has a technical score of 6.65 points, which is higher than that of 71.3% 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%

7.7

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
3.9
(14356)
amazon
3.8
(5837)
amazon
3.7
(233)
amazon
2.5
(45)
United States
Amazon_logo.png
3.9
(14356)
Amazon_logo.png
3.8
(5837)
Amazon_logo.png
3.7
(233)
Amazon_logo.png
2.5
(45)

(Reviews last updated: June 2026)

8.4
Boult Audio Flex has a user score of 8.41 points, which is higher than that of 80.3% 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
Boult Audio Flex has a popularity of 10 points, which is higher than 91.9% 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%

7.0

Overall score

40.0%

10

Price

7.9
Boult Audio Flex has a quality-to-price ratio of 7.9 points, which is higher than 74.8% 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
Boult Audio Flex does not support active noise cancellation. 27.5% 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: HIGH

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: HIGH

40 mm
Boult Audio Flex 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
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
Boult Audio Flex uses 1 drivers, fewer drivers than 4% of headphones and 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
Boult Audio Flex 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
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: LOW

yes
Boult Audio Flex supports a noise-canceling microphone. 61.1% 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: LOW

yes
Boult Audio Flex is headset-ready, 84.8% is not. 15.2% 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
Boult Audio Flex has 1 microphones, more microphones than 26.9% of headphones and equal to 50.9% 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
Boult Audio Flex does not include a boom microphone. 13.5% 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: LOW

wireless
Boult Audio Flex supports wireless connectivity, more flexible connectivity than 50.8% of headphones and equal to 49.2% of headphones.
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: LOW

Good value: >=5.0

5.4
Boult Audio Flex uses Bluetooth version 5.4, newer Bluetooth version than 95.2% of headphones and equal to 4.1% 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

10 m
Boult Audio Flex offers a Bluetooth range of 10 m, higher Bluetooth range than 2.7% of headphones and equal to 80.6% 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: MEDIUM

Good value: <60 ms

60 ms
Boult Audio Flex has audio latency of 60 ms, lower audio latency than 65.5% of headphones and equal to 6.2% 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: LOW

yes
Boult Audio Flex supports multipoint. 69.4% 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

yes
Boult Audio Flex supports ambient sound mode. 75.2% of headphones support ambient sound mode.
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

?
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
Boult Audio Flex does not work with a companion app. 21.6% 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: HIGH

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
Boult Audio Flex 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: LOW

Good value: >45 hours

65 hours
Boult Audio Flex offers battery life of 65 hours, higher battery life than 85.5% of headphones and equal to 1.8% 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: LOW

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: LOW

Good value: <=2 hours

1 hours
Boult Audio Flex needs 1 hours to charge, lower charging time than 96.1% of headphones and equal to 3.3% 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: LOW

yes
Boult Audio Flex supports quick charge. 67% 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: LOW

Good value: >=720 mAh

750 mAh
Boult Audio Flex has a battery capacity of 750 mAh, higher battery capacity than 71.9% of headphones and equal to 2.6% 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: LOW

Boult
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: LOW

over-ear
Weight
What it is: Total weight of the headphones
When it matters: When long listening sessions make wearing comfort more important.

Importance: HIGH

Good value: <150 g

214 g
Boult Audio Flex weighs 214 g, lighter than 51.4% of headphones and equal to 0.2% 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: LOW

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: LOW

?
Show more

Boult Audio Flex vs the average pair of headphones

  • Ambient sound mode
    Boult Audio Flex supports ambient sound mode, the average pair of headphones does not. 24.9% of headphones support 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

    Boult Audio Flex supports ambient sound mode, the average pair of headphones does not. 24.9% of headphones support ambient sound mode.
  • 16 dB/mW higher sensitivity
    Boult Audio Flex has a higher sensitivity than the average pair of headphones (118 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

    Boult Audio Flex has a higher sensitivity than the average pair of headphones (118 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.118 dB/mW vs 102 dB/mW
  • Multipoint support
    Boult Audio Flex supports multipoint, the average pair of headphones does not. 30.6% of headphones support multipoint.
    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: LOW

    Boult Audio Flex supports multipoint, the average pair of headphones does not. 30.6% of headphones support multipoint.
  • 35 hours longer battery life
    Boult Audio Flex has a higher battery life than the average pair of headphones (65 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: LOW

    Good value: >45 hours

    Boult Audio Flex has a higher battery life than the average pair of headphones (65 hours vs 30 hours). The average headphones offer battery life of 30 hours.65 hours vs 30 hours
  • More flexible connectivity
    Boult Audio Flex offers more flexible connectivity than the average pair of headphones (wireless vs wired). The average headphones support 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: LOW

    Boult Audio Flex 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
    Boult Audio Flex offers a clear call microphone, while the average pair of headphones does not. 39% 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: LOW

    Boult Audio Flex offers a clear call microphone, while the average pair of headphones does not. 39% of headphones support noise-canceling microphones.
  • 1 hours shorter charging time
    Boult Audio Flex has a lower charging time than the average pair of headphones (1 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: LOW

    Good value: <=2 hours

    Boult Audio Flex has a lower charging time than the average pair of headphones (1 hours vs 2 hours). The average headphones need 2 hours to charge.1 hours vs 2 hours
  • Quick charge support
    Boult Audio Flex supports quick charge, the average pair of headphones does not. 33% of headphones support 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: LOW

    Boult Audio Flex supports quick charge, the average pair of headphones does not. 33% of headphones support quick charge.
  • Foldable design
    Boult Audio Flex has a foldable design, the average pair of headphones does not. 48.3% of headphones are foldable.
  • Water resistance
    Boult Audio Flex is water resistant, the average pair of headphones is not. 20.2% of headphones are water resistant.
  • Better IP rating
    Boult Audio Flex has a better IP rating than the average pair of headphones (IPX5 vs none). The average headphones have an IP rating of none.
  • 16 dB/mW higher sensitivity
    Boult Audio Flex has a higher sensitivity than the average pair of headphones (118 dB/mW vs 102 dB/mW). The average headphones have sensitivity of 102 dB/mW.
  • 15 dB SPL higher sound pressure level
    Boult Audio Flex has a higher sound pressure level than the average pair of headphones (118 dB SPL vs 103 dB SPL). The average headphones reach a sound pressure level of 103 dB SPL.
  • 35 hours longer battery life
    Boult Audio Flex has a higher battery life than the average pair of headphones (65 hours vs 30 hours). The average headphones offer battery life of 30 hours.
  • 1 hours shorter charging time
    Boult Audio Flex has a lower charging time than the average pair of headphones (1 hours vs 2 hours). The average headphones need 2 hours to charge.
  • Quick charge support
    Boult Audio Flex supports quick charge, the average pair of headphones does not. 33% of headphones support quick charge.
  • USB-C charging
    Boult Audio Flex uses USB-C charging, the average pair of headphones does not. 29.5% of headphones use USB Type-C.
  • 29.3% higher battery capacity
    Boult Audio Flex has a higher battery capacity than the average pair of headphones (750 mAh vs 580 mAh). The average headphones have a battery capacity of 580 mAh.
  • Rechargeable battery
    Boult Audio Flex has a rechargeable battery, the average pair of headphones does not. 47.9% of headphones have a rechargeable battery.
  • Multipoint support
    Boult Audio Flex supports multipoint, the average pair of headphones does not. 30.6% of headphones support multipoint.
  • More flexible connectivity
    Boult Audio Flex offers more flexible connectivity than the average pair of headphones (wireless vs wired). The average headphones support wired connectivity.
  • 90 ms lower audio latency
    Boult Audio Flex has a lower audio latency than the average pair of headphones (60 ms vs 150 ms). The average headphones have audio latency of 150 ms.
  • Fast pairing support
    Boult Audio Flex supports fast pairing, the average pair of headphones does not. 14% of headphones support fast pairing.
  • Low-latency game mode
    Boult Audio Flex includes a low-latency game mode, the average pair of headphones does not. 21.2% of headphones support low-latency game mode.
  • Clear call microphone
    Boult Audio Flex offers a clear call microphone, while the average pair of headphones does not. 39% of headphones support noise-canceling microphones.
  • On-device controls
    Boult Audio Flex includes on-device controls, the average pair of headphones does not. 46.8% of headphones support on-device controls.
  • Wind noise reduction
    Boult Audio Flex reduces wind noise, the average pair of headphones does not. 34.3% of headphones support wind noise reduction.
  • Ambient sound mode
    Boult Audio Flex supports ambient sound mode, the average pair of headphones does not. 24.9% of headphones support ambient sound mode.

Total
Overall
Design
Sound
Battery
Connectivity
Calls & Controls
Features
  • No travel bag
    Boult Audio Flex does not include a travel bag, the average pair of headphones does. 65.4% of headphones include a travel bag.
  • 2 Hz weaker bass extension
    Boult Audio Flex 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.
  • 2 Hz weaker bass extension
    Boult Audio Flex 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.
    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

    Boult Audio Flex 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
  • No travel bag
    Boult Audio Flex does not include a travel bag, the average pair of headphones does. 65.4% 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

    Boult Audio Flex does not include a travel bag, the average pair of headphones does. 65.4% of headphones include a travel bag.
Total
Design
Sound

Graphic comparison of Boult Audio Flex and other products in the Headphones category

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Third-party reviews

United Kingdom
amazon
3.9
14356 Reviews
amazon
3.8
5837 Reviews
amazon
3.7
233 Reviews
amazon
2.5
45 Reviews
United States
Amazon_logo.png
3.9
14356 Reviews
Amazon_logo.png
3.8
5837 Reviews
Amazon_logo.png
3.7
233 Reviews
Amazon_logo.png
2.5
45 Reviews

(Reviews last updated: June 2026)

What customers like about Boult Audio Flex?

  • Impressive battery life, with some models offering up to 80 hours of playtime
  • Deep, thumping bass that appeals to bass enthusiasts
  • Affordable price point, often cited as high value for money in the budget segment
  • Comfortable memory foam ear cushions suitable for extended wear
  • Lightweight and foldable design, making them portable and travel-friendly
  • Dual-mode functionality allows for both wireless Bluetooth and wired AUX use

What customers dislike about Boult Audio Flex?

  • Frequent Bluetooth connectivity issues, including repeated auto-disconnections
  • Mixed build quality with reports of the headband or joints breaking after short-term use
  • Passive noise cancellation is often described as ineffective or non-existent
  • Microphone performance can be unreliable, particularly during calls or when using AUX mode
  • Average sound clarity; high volumes may lead to some audio distortion
  • Customer service and after-sales support have received significant negative feedback

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