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Harman Kardon Onyx Studio 8 Review | 130 Data compared

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  • Avg. price in UK: ~£210
  • Avg. price in US: ~$170
  • Audio output power: 50.00 W
  • Battery life: 8 hours
  • IP rating: ?
  • Bluetooth version: 5.2
  • Weight: 3520 g

Harman Kardon Onyx Studio 8 review. Compare 130 technical specifications and user reviews to see how this product ranks in the Portable Speakers category and whether it is worth buying.

7.0

Overall score

What it is: An overall evaluation of products in the Portable Speakers category, based on technical analysis and user reviews.

When it matters: When you need a quick reference for identifying the best products in the Portable Speakers category.

Score components:

80.0%

6.4

Technical Score

20.0%

9.4

User score

Very good
6.4

Technical Score

What it is: An assessment of technical performance for products in the Portable Speakers category across these key areas: Audio, Connectivity, Battery, Durability, Controls, Design, Smart features.

When it matters: When you want to compare products in the Portable Speakers category by technical performance, specifications, and available features.

Score components:

32.0%

8.1

Audio

20.0%

5.4

Battery

18.0%

5.3

Durability

16.0%

6.4

Connectivity

8.0%

4.8

Controls

3.0%

5.5

Design

3.0%

5.0

Smart features

Good
9.4

User score

What it is: A rating that combines user reviews with the total review volume for products in the Portable Speakers category.

When it matters: When you want to know how products in the Portable Speakers category perform in everyday use and how reliable owners find them over time.

Score components:

70.0%

9.2

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.7
(824)
amazon
4.6
(223)
amazon
4.4
(138)
amazon
4.5
(72)
amazon
4.9
(20)
amazon
4.7
(12)
United States
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4.6
(836)
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4.6
(362)
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4.7
(229)
Amazon_logo.png
4.4
(77)

(Reviews last updated: August 2026)

Exceptional
  • 5.3
    Outdoor durability

    Score components:

    40.0%

    4.0

    Water resistance

    25.0%

    ?

    IP rating

    20.0%

    6.3

    Weight

    15.0%

    2.8

    Battery life

  • 5.3
    Powerful sound

    Score components:

    45.0%

    6.9

    Audio output power

    25.0%

    2.8

    Battery life

    15.0%

    6.3

    Weight

    15.0%

    4.0

    Party mode

  • 4.9
    Home listening

    Score components:

    35.0%

    4.0

    Multi-room support

    30.0%

    4.0

    Wi-Fi connectivity

    20.0%

    6.9

    Audio output power

    15.0%

    6.3

    Weight

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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 Harman Kardon Onyx Studio 8 is a premium portable Bluetooth 5.2 speaker featuring a distinctive circular design with an integrated anodized aluminum handle, housing a 120mm woofer and two 20mm tweeters that deliver 50W RMS of stereo power across a 50Hz to 20kHz frequency response. Weighing 3.52 kg, its primary strengths include deep, rich bass performance, an automatic room calibration feature that self-tunes audio to surrounding acoustics, and integrated dual far-field microphones for clear hands-free calling. However, its downsides include a relatively short battery life of up to 8 hours that drops down to 30W output when unplugged, a slow 5-hour recharge time, a lack of an IP water or dust resistance rating, and a lack of companion app support for manual EQ customization.

Technical Specifications of portable speaker Harman Kardon Onyx Studio 8

Technical Score

What it is: An assessment of technical performance for products in the Portable Speakers category across these key areas: Audio, Connectivity, Battery, Durability, Controls, Design, Smart features.

When it matters: When you want to compare products in the Portable Speakers category by technical performance, specifications, and available features.

Score components:

32.0%

8.1

Audio

20.0%

5.4

Battery

18.0%

5.3

Durability

16.0%

6.4

Connectivity

8.0%

4.8

Controls

3.0%

5.5

Design

3.0%

5.0

Smart features

6.4
Harman Kardon Onyx Studio 8 has a technical score of 6.36 points, which is lower than 75.7% of products in this category.
User score

What it is: A rating that combines user reviews with the total review volume for products in the Portable Speakers category.

When it matters: When you want to know how products in the Portable Speakers category perform in everyday use and how reliable owners find them over time.

Score components:

70.0%

9.2

User reviews

30.0%

10

Popularity

User score:
United Kingdom
amazon
4.7
(824)
amazon
4.6
(223)
amazon
4.4
(138)
amazon
4.5
(72)
amazon
4.9
(20)
amazon
4.7
(12)
United States
Amazon_logo.png
4.6
(836)
Amazon_logo.png
4.6
(362)
Amazon_logo.png
4.7
(229)
Amazon_logo.png
4.4
(77)

(Reviews last updated: August 2026)

9.4
Harman Kardon Onyx Studio 8 has a user score of 9.43 points, which is higher than 89.7% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by products in the Portable Speakers category.
When it matters: When you prefer products in the Portable Speakers category that have been chosen and reviewed by many other buyers.
10
Harman Kardon Onyx Studio 8 has a popularity of 10 points, which is higher than 66.6% of products in this category.
Ratio quality/price

What it is: An indicator that combines the overall score of products in the Portable Speakers category with their prices.

When it matters: When you are comparing products in the Portable Speakers category and want a good balance between quality and price.

Score components:

60.0%

7.0

Overall score

40.0%

9.4

Price

7.7
Harman Kardon Onyx Studio 8 has a quality-to-price ratio of 7.7 points, which is higher than 40.7% of products in this category.
Audio output power
What it is: The maximum continuous power the speaker system can deliver.
When it matters: When you need enough output to fill a larger or noisier space.

Importance: HIGH

Good value: >= 20 W

50.00 W
Harman Kardon Onyx Studio 8 has an audio output power of 50.00 W which is higher than that of 75.8% of portable speakers and equal to that of 3.3% of portable speakers.
Total RMS output: 50.00 W.
Driver unit size
What it is: The diameter of each main speaker driver.
When it matters: When the size of the main driver influences bass reach and output capability.

Importance: HIGH

Good value: >= 50 mm

?
Number of drivers
What it is: The total number of speaker drivers built into the unit.
When it matters: When fuller driver arrays and broader sound coverage matter.

Importance: MEDIUM

Good value: >= 2

3
Harman Kardon Onyx Studio 8 has 3 drivers, which is more than 70.1% of portable speakers and equal to the number in 11.5% of portable speakers.
Acoustic drivers: 3.
Frequency response tolerance
What it is: The allowed deviation around the stated frequency response curve.
When it matters: When a flatter and more accurate frequency response matters.

Importance: MEDIUM

Good value: <= 3 dB

?
Lowest frequency
What it is: The lowest audible frequency the speaker can reproduce.
When it matters: When deeper bass extension matters.

Importance: HIGH

Good value: <= 60 Hz

50.00 Hz
Harman Kardon Onyx Studio 8 has a lowest frequency of 50.00 Hz which is lower than that of 59.9% of portable speakers and equal to that of 9.1% of portable speakers.
Lower frequency-response endpoint: 50.00 Hz.
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Bluetooth connectivity
What it is: Indicates whether the speaker can receive audio over Bluetooth.
When it matters: When wireless playback from phones, tablets, or computers matters.

Importance: MEDIUM

Good value: yes

yes
Harman Kardon Onyx Studio 8 supports Bluetooth audio. 5.4% of portable speakers offer this feature.
Bluetooth version
What it is: The generation of Bluetooth supported by the speaker hardware.
When it matters: When compatibility and efficiency with newer Bluetooth devices matter.

Importance: LOW

Good value: >= 5.0

5.2
Harman Kardon Onyx Studio 8 supports Bluetooth version 5.2 which is newer than that of 75.8% of portable speakers and equal to that of 2.9% of portable speakers.
Bluetooth version: 5.2.
Maximum Bluetooth range
What it is: The farthest distance at which the Bluetooth link can remain usable.
When it matters: When the source device may be far from the speaker.

Importance: MEDIUM

Good value: >= 10 m

10.00 m
Harman Kardon Onyx Studio 8 has a maximum Bluetooth range of 10.00 m which is longer than that of 4.3% of portable speakers and equal to that of 70.2% of portable speakers.
Maximum Bluetooth range: 10.00 m.
Bluetooth profiles supported
What it is: The Bluetooth operating profiles available for playback, control, or calls.
When it matters: When Bluetooth playback, control, and call compatibility depend on specific profiles.

Importance: LOW

A2DP; AVRCP
Bluetooth LE Audio
What it is: Shows whether the speaker supports the low-energy Bluetooth audio standard.
When it matters: When newer low-power Bluetooth audio features matter.

Importance: LOW

Good value: yes

?
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Battery life
What it is: The playback time available from one full battery charge.
When it matters: When you need longer playback between charges.

Importance: HIGH

Good value: >= 20 h

8 hours
Harman Kardon Onyx Studio 8 has a battery life of 8 hours which is shorter than that of 68.9% of portable speakers and equal to that of 11.6% of portable speakers.
Battery capacity
What it is: The amount of electrical charge the internal battery can store.
When it matters: When longer untethered playback or power-bank use needs more stored charge.

Importance: HIGH

Good value: >= 5000 mAh

3,250 mAh
Harman Kardon Onyx Studio 8 has a battery capacity of 3,250 mAh which is larger than that of 64.4% of portable speakers and equal to that of 0.2% of portable speakers.
Charging time
What it is: The time needed to recharge the battery fully.
When it matters: When the speaker needs to be ready again quickly.

Importance: MEDIUM

Good value: <= 4 h

5 hours
Harman Kardon Onyx Studio 8 has a charging time of 5 hours which is longer than that of 87% of portable speakers and equal to that of 7.7% of portable speakers.
Maximum charging input power
What it is: The maximum charging power the speaker can accept from a compatible power source.
When it matters: When faster charging requires the speaker to accept more input power.

Importance: LOW

Good value: >= 20 W

38 W
Harman Kardon Onyx Studio 8 has a maximum charging input power of 38 W which is higher than that of 93.3% of portable speakers and equal to that of 0.4% of portable speakers.
Built-in rechargeable battery
What it is: Indicates whether the speaker uses a battery that can be recharged.
When it matters: When portable use without disposable batteries or continuous mains power matters.

Importance: LOW

Good value: yes

yes
Harman Kardon Onyx Studio 8 has a built-in rechargeable battery. 18.7% of portable speakers offer this feature.
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IP rating
What it is: The ingress protection code for dust and water resistance.
When it matters: When dust and water protection need to match the intended environment.

Importance: HIGH

Good value: IP67+

?
Water resistance
What it is: Indicates whether the enclosure can resist water exposure.
When it matters: When the speaker may be used near pools, rain, or splashes.

Importance: MEDIUM

Good value: yes

no
Harman Kardon Onyx Studio 8 is not water resistant. 61.7% of portable speakers offer this feature.
Dust resistance
What it is: Shows whether the enclosure is protected against dust ingress.
When it matters: When the speaker may be exposed to sand, soil, or dusty environments.

Importance: MEDIUM

Good value: yes

no
Harman Kardon Onyx Studio 8 is not rated as dust resistant. 51.5% of portable speakers offer this feature.
Waterproof depth rating
What it is: The maximum water depth the speaker is rated to withstand.
When it matters: When the speaker may be submerged or used very close to water.

Importance: MEDIUM

Good value: >= 1 m

0 m
Harman Kardon Onyx Studio 8 is not rated for underwater use. 47.6% of cameras have a native waterproof depth rating.
Drop resistance
What it is: Indicates whether the housing is designed to survive accidental drops.
When it matters: When the speaker may be bumped or suffer an accidental fall during outdoor or travel use.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 lacks an impact-resistance rating. 32.8% of portable speakers offer this feature.
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On-device controls placement
What it is: The physical area of the speaker where its controls are located.
When it matters: When you want controls that are easy to reach in the speaker intended placement.

Importance: LOW

top
Touchscreen
What it is: Indicates whether a touch-sensitive screen is integrated.
When it matters: When direct visual control is more convenient than buttons or an app.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not have a touchscreen. 0.3% of portable speakers offer this feature.
The speaker does not have an integrated touchscreen.
Smartphone app control
What it is: Shows whether the speaker can be controlled from a phone app.
When it matters: When remote settings, updates, or sound adjustment from a phone matter.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not support smartphone app control. 54% of portable speakers offer this feature.
No compatible mobile app for speaker control.
Remote control
What it is: Indicates whether a dedicated remote control is supplied or supported.
When it matters: When you want to control playback from across the room.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not include a remote control. 15% of portable speakers offer this feature.
No dedicated remote control is documented.
Fast pairing
What it is: Shows whether setup with compatible devices can be completed more quickly.
When it matters: When quick setup with compatible devices matters.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not support fast pairing. 22.5% of portable speakers offer this feature.
No qualifying fast-pair capability; initial pairing is manual or standard.
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Weight
What it is: The total mass of the portable speaker.
When it matters: When carrying the speaker frequently or packing light matters.

Importance: LOW

Good value: <= 1000 g

3,520 g
Harman Kardon Onyx Studio 8 weighs 3,520 g which is heavier than that of 84.1% of portable speakers.
Height
What it is: The vertical external dimension of the speaker body.
When it matters: When the speaker must fit beneath shelves or in a compact bag.

Importance: LOW

Good value: <= 20 cm

27.58 cm
Harman Kardon Onyx Studio 8 has a height of 27.58 cm which is taller than that of 89.1% of portable speakers.
Width
What it is: The side-to-side external dimension of the speaker body.
When it matters: When the speaker must fit a narrow shelf, bag, or tabletop.

Importance: LOW

Good value: <= 25 cm

31.2 cm
Harman Kardon Onyx Studio 8 has a width of 31.2 cm which is wider than that of 82.2% of portable speakers and equal to that of 0.1% of portable speakers.
Depth
What it is: The front-to-back depth of the speaker housing.
When it matters: When the speaker should take up less front-to-back space.

Importance: LOW

Good value: <= 10 cm

16.38 cm
Harman Kardon Onyx Studio 8 has a depth of 16.38 cm which is deeper than that of 83.6% of portable speakers.
Carry options
What it is: The available ways to carry, hang, or attach the speaker.
When it matters: When a handle, strap, or attachment point changes how you carry the speaker.

Importance: LOW

handle
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Companion app name
What it is: The official app used to control settings and functions of the speaker.
When it matters: When app compatibility and the available control features depend on the official app.

Importance: LOW

?
Firmware updates
What it is: Indicates whether the speaker can receive firmware revisions after purchase.
When it matters: When post-purchase fixes and feature improvements matter.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not support firmware updates. 47.2% of portable speakers offer this feature.
No supported user-accessible firmware update path.
Firmware update method
What it is: The path used to install firmware updates on the speaker.
When it matters: When the convenience and reliability of installing updates matters.

Importance: LOW

USB
Voice assistant support
What it is: Indicates whether the speaker can work with supported voice assistants.
When it matters: When hands-free control through a compatible assistant matters.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not support voice assistants. 26.5% of portable speakers offer this feature.
No direct supported voice-assistant control.
Spotify Connect
What it is: Shows whether Spotify can stream directly to the speaker over the network.
When it matters: When Spotify should stream directly without keeping phone audio active.

Importance: LOW

Good value: yes

no
Harman Kardon Onyx Studio 8 does not support Spotify Connect. 10.8% of portable speakers offer this feature.
Does not support native Spotify Connect.
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Harman Kardon Onyx Studio 8 vs the average portable speaker

  • 30 W more audio output power
    Harman Kardon Onyx Studio 8 has more audio output power than the average portable speaker (50 W vs 20.00 W).
    Total RMS output: 50.00 W.
    What it is: The maximum continuous power the speaker system can deliver.
    When it matters: When you need enough output to fill a larger or noisier space.

    Importance: HIGH

    Good value: >= 20 W

    Harman Kardon Onyx Studio 8 has more audio output power than the average portable speaker (50 W vs 20.00 W).50.00 W vs 20.00 W
  • 1 more multipoint connections
    Harman Kardon Onyx Studio 8 has more multipoint connections than the average portable speaker (2 vs 1).
    Simultaneous Bluetooth devices: 2.
    What it is: The number of source devices that can stay connected at the same time.
    When it matters: When switching between several connected source devices matters.

    Importance: MEDIUM

    Good value: >= 2

    Harman Kardon Onyx Studio 8 has more multipoint connections than the average portable speaker (2 vs 1).2 vs 1
  • 28 W higher charging input power
    Harman Kardon Onyx Studio 8 has higher charging input power than the average portable speaker (38 W vs 10 W).
    What it is: The maximum charging power the speaker can accept from a compatible power source.
    When it matters: When faster charging requires the speaker to accept more input power.

    Importance: LOW

    Good value: >= 20 W

    Harman Kardon Onyx Studio 8 has higher charging input power than the average portable speaker (38 W vs 10 W).38 W vs 10 W
  • Has a noise-canceling microphone
    Harman Kardon Onyx Studio 8 has a noise-canceling microphone, while the average portable speaker does not have a noise-canceling microphone.
    Uses microphone noise/echo cancellation for calls or voice.
    What it is: Indicates whether the microphones can reduce surrounding noise during capture.
    When it matters: When calls or voice commands must remain clear around background noise.

    Importance: LOW

    Good value: yes

    Harman Kardon Onyx Studio 8 has a noise-canceling microphone, while the average portable speaker does not have a noise-canceling microphone.
  • Has built-in stereo speakers
    Harman Kardon Onyx Studio 8 has built-in stereo speakers, while the average portable speaker does not have built-in stereo speakers.
    Provides true stereo output within the unit.
    What it is: Shows whether the device uses separate left and right audio channels.
    When it matters: When true left-and-right channel playback matters without pairing a second speaker.

    Importance: LOW

    Good value: yes

    Harman Kardon Onyx Studio 8 has built-in stereo speakers, while the average portable speaker does not have built-in stereo speakers.
  • 1 more speaker drivers
    Harman Kardon Onyx Studio 8 has more speaker drivers than the average portable speaker (3 vs 2).
    Acoustic drivers: 3.
    What it is: The total number of speaker drivers built into the unit.
    When it matters: When fuller driver arrays and broader sound coverage matter.

    Importance: MEDIUM

    Good value: >= 2

    Harman Kardon Onyx Studio 8 has more speaker drivers than the average portable speaker (3 vs 2).3 vs 2
  • 1 more microphones
    Harman Kardon Onyx Studio 8 has more microphones than the average portable speaker (2 vs 1).
    Built-in microphones: 2.
    What it is: The number of microphones built into the speaker.
    When it matters: When voice pickup, calls, or beamforming performance matter.

    Importance: LOW

    Good value: >= 1

    Harman Kardon Onyx Studio 8 has more microphones than the average portable speaker (2 vs 1).2 vs 1
  • Has a USB Type-C port
    Harman Kardon Onyx Studio 8 has a USB Type-C port, while the average portable speaker does not have a USB Type-C port.
    Has a physical USB-C port.
    What it is: Indicates whether the device uses a USB Type-C connector.
    When it matters: When modern charging and connection compatibility matter.

    Importance: LOW

    Good value: yes

    Harman Kardon Onyx Studio 8 has a USB Type-C port, while the average portable speaker does not have a USB Type-C port.
  • 30 W more audio output power
    Harman Kardon Onyx Studio 8 has more audio output power than the average portable speaker (50 W vs 20.00 W).
  • Has a noise-canceling microphone
    Harman Kardon Onyx Studio 8 has a noise-canceling microphone, while the average portable speaker does not have a noise-canceling microphone.
  • Has built-in stereo speakers
    Harman Kardon Onyx Studio 8 has built-in stereo speakers, while the average portable speaker does not have built-in stereo speakers.
  • 1 more speaker drivers
    Harman Kardon Onyx Studio 8 has more speaker drivers than the average portable speaker (3 vs 2).
  • 1 more microphones
    Harman Kardon Onyx Studio 8 has more microphones than the average portable speaker (2 vs 1).
  • Has beamforming microphones
    Harman Kardon Onyx Studio 8 has beamforming microphones, while the average portable speaker does not have beamforming microphones.
  • 10 Hz deeper bass extension
    Harman Kardon Onyx Studio 8 has deeper bass extension than the average portable speaker (50 Hz vs 60.00 Hz).
  • 1 more multipoint connections
    Harman Kardon Onyx Studio 8 has more multipoint connections than the average portable speaker (2 vs 1).
  • Has a USB Type-C port
    Harman Kardon Onyx Studio 8 has a USB Type-C port, while the average portable speaker does not have a USB Type-C port.
  • 0.2 Bluetooth levels newer
    Harman Kardon Onyx Studio 8 has a newer Bluetooth version than the average portable speaker (5.2 vs 5.0).
  • 28 W higher charging input power
    Harman Kardon Onyx Studio 8 has higher charging input power than the average portable speaker (38 W vs 10 W).
  • 650 mAh more battery capacity
    Harman Kardon Onyx Studio 8 has a larger battery capacity than the average portable speaker (3,250 mAh vs 2,600 mAh).
  • Supports automatic room calibration
    Harman Kardon Onyx Studio 8 supports automatic room calibration, while the average portable speaker does not support automatic room calibration.

Total
Overall
Audio
Connectivity
Battery
Smart features
  • 2 hours longer charging time
    Harman Kardon Onyx Studio 8 has a longer charging time than the average portable speaker (5 hours vs 3 hours).
  • 4 hours shorter battery life
    Harman Kardon Onyx Studio 8 has a shorter battery life than the average portable speaker (8 hours vs 12 hours).
  • Is not water resistant
    Harman Kardon Onyx Studio 8 is not water resistant, while the average portable speaker is water resistant.
  • Is not rated as dust resistant
    Harman Kardon Onyx Studio 8 is not rated as dust resistant, while the average portable speaker is dust resistant.
  • Does not support smartphone app control
    Harman Kardon Onyx Studio 8 does not support smartphone app control, while the average portable speaker supports smartphone app control.
    No compatible mobile app for speaker control.
  • 2,720 g heavier
    Harman Kardon Onyx Studio 8 is heavier than the average portable speaker (3,520 g vs 800 g).
  • 15.18 cm taller
    Harman Kardon Onyx Studio 8 is taller than the average portable speaker (27.6 cm vs 12.4 cm).
  • 13.1 cm wider
    Harman Kardon Onyx Studio 8 is wider than the average portable speaker (31.2 cm vs 18.1 cm).
  • 8.08 cm deeper
    Harman Kardon Onyx Studio 8 is deeper than the average portable speaker (16.4 cm vs 8.3 cm).
  • Is not water resistant
    Harman Kardon Onyx Studio 8 is not water resistant, while the average portable speaker is water resistant.
    What it is: Indicates whether the enclosure can resist water exposure.
    When it matters: When the speaker may be used near pools, rain, or splashes.

    Importance: MEDIUM

    Good value: yes

    Harman Kardon Onyx Studio 8 is not water resistant, while the average portable speaker is water resistant.
  • Is not rated as dust resistant
    Harman Kardon Onyx Studio 8 is not rated as dust resistant, while the average portable speaker is dust resistant.
    What it is: Shows whether the enclosure is protected against dust ingress.
    When it matters: When the speaker may be exposed to sand, soil, or dusty environments.

    Importance: MEDIUM

    Good value: yes

    Harman Kardon Onyx Studio 8 is not rated as dust resistant, while the average portable speaker is dust resistant.
  • 2 hours longer charging time
    Harman Kardon Onyx Studio 8 has a longer charging time than the average portable speaker (5 hours vs 3 hours).
    What it is: The time needed to recharge the battery fully.
    When it matters: When the speaker needs to be ready again quickly.

    Importance: MEDIUM

    Good value: <= 4 h

    Harman Kardon Onyx Studio 8 has a longer charging time than the average portable speaker (5 hours vs 3 hours).5 hours vs 3 hours
  • Does not support smartphone app control
    Harman Kardon Onyx Studio 8 does not support smartphone app control, while the average portable speaker supports smartphone app control.
    No compatible mobile app for speaker control.
    What it is: Shows whether the speaker can be controlled from a phone app.
    When it matters: When remote settings, updates, or sound adjustment from a phone matter.

    Importance: LOW

    Good value: yes

    Harman Kardon Onyx Studio 8 does not support smartphone app control, while the average portable speaker supports smartphone app control.
  • 4 hours shorter battery life
    Harman Kardon Onyx Studio 8 has a shorter battery life than the average portable speaker (8 hours vs 12 hours).
    What it is: The playback time available from one full battery charge.
    When it matters: When you need longer playback between charges.

    Importance: HIGH

    Good value: >= 20 h

    Harman Kardon Onyx Studio 8 has a shorter battery life than the average portable speaker (8 hours vs 12 hours).8 hours vs 12 hours
  • 2,720 g heavier
    Harman Kardon Onyx Studio 8 is heavier than the average portable speaker (3,520 g vs 800 g).
    What it is: The total mass of the portable speaker.
    When it matters: When carrying the speaker frequently or packing light matters.

    Importance: LOW

    Good value: <= 1000 g

    Harman Kardon Onyx Studio 8 is heavier than the average portable speaker (3,520 g vs 800 g).3520 g vs 800 g
  • 15.18 cm taller
    Harman Kardon Onyx Studio 8 is taller than the average portable speaker (27.6 cm vs 12.4 cm).
    What it is: The vertical external dimension of the speaker body.
    When it matters: When the speaker must fit beneath shelves or in a compact bag.

    Importance: LOW

    Good value: <= 20 cm

    Harman Kardon Onyx Studio 8 is taller than the average portable speaker (27.6 cm vs 12.4 cm).27.58 cm vs 12.4 cm
  • 13.1 cm wider
    Harman Kardon Onyx Studio 8 is wider than the average portable speaker (31.2 cm vs 18.1 cm).
    What it is: The side-to-side external dimension of the speaker body.
    When it matters: When the speaker must fit a narrow shelf, bag, or tabletop.

    Importance: LOW

    Good value: <= 25 cm

    Harman Kardon Onyx Studio 8 is wider than the average portable speaker (31.2 cm vs 18.1 cm).31.2 cm vs 18.1 cm
Total
Overall
Battery
Durability
Controls
Design

Graphic comparison of Harman Kardon Onyx Studio 8 and other products in the Portable Speakers category

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Third-party reviews

United Kingdom
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United States
Amazon_logo.png
4.6
836 Reviews
Amazon_logo.png
4.6
362 Reviews
Amazon_logo.png
4.7
229 Reviews
Amazon_logo.png
4.4
77 Reviews

(Reviews last updated: August 2026)

What customers like about Harman Kardon Onyx Studio 8?

  • Excellent sound quality with well-balanced mids and crisp highs.
  • Deep, strong, and punchy bass performance that easily fills large rooms.
  • Unique, elegant planetoid design with an integrated anodised aluminium handle for easy carrying.
  • Eco-friendly build utilising recycled plastics and sustainable polyester yarn fabrics.
  • Automatic room calibration feature that self-tunes the audio profile based on its environment.
  • Supports wireless dual sound pairing to connect two units for a true stereo setup.
  • Includes a built-in microphone for crystal-clear, hands-free voice calls.

What customers dislike about Harman Kardon Onyx Studio 8?

  • Lacks any official IP rating for water or dust resistance, making it unsuitable for pool, beach, or rain use.
  • Relatively short battery life (advertised up to 8 hours) that drops faster at higher volumes or when heavy bass is playing.
  • Noticeable loss of peak power output and deep bass response when unplugged from the mains.
  • High latency with iOS and Android devices, which can cause annoying lip-sync issues when watching videos.
  • Heavy and bulky form factor (weighing around 3 kg) compared to other highly rugged outdoor bluetooth speakers.
  • Audio compression and distortion can occur when pushing the unit to its maximum volume.
  • Cannot be paired with more than two units simultaneously, limiting wider multi-room configurations.

Expert reviews

R
rtings.com
15/11/2022
Summary of the review
Harman/Kardon Onyx Studio 8 Speaker Review
I
imore.com
18/05/2023
Summary of the review
Harman Kardon Onyx 8 Bluetooth Speaker review - The weird sound planetoid
C
consumerreports.org
01/03/2024
Summary of the review
Harman Kardon Onyx Studio 8 Wireless & Bluetooth Speaker Review If you are looking to buy this model, I can help you find current pricing, compare it...
K
konsolenfan.de
20/03/2023
Summary of the review
Review: Harman Kardon Onyx Studio 8 – a premium Bluetooth speaker for the home
(Translated)Show original
L
leclaireur.fnac.com
12/12/2023
Summary of the review
Harman-Kardon Onyx Studio 8 Lab Test: Substance and Style
(Translated)Show original
C
culturasonora.es
2026 (Última actualización de la guía)
Summary of the review
Harman Kardon Onyx Studio 8: The best Bluetooth speaker
(Translated)Show original
P
publimetro.cl
13/12/2023
Summary of the review
Harman Kardon Onyx Studio 8 Review: Quality Audio meets Stunning Design
(Translated)Show original
I
infobae.com
29/12/2023
Summary of the review
How we did with the Onyx Studio 8, the speaker that resembles the planet Saturn
(Translated)Show original
F
fwd.nl
31/08/2022
Summary of the review
Harman Kardon Onyx Studio 8 is an elegant premium Bluetooth speaker
(Translated)Show original

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