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The Harman Kardon Onyx Studio 9 speaker epitomizes the understated elegance of a living room Bluetooth speaker. Compact in design, it features a three-way system, a rarity in its category, offering an extended frequency response for a rich and detailed sound. Since being acquired by Samsung nearly a decade ago, Harman Kardon has been quietly operating under the radar, overshadowed by its more publicized sibling, JBL.
Following its acquisition of renowned brands like Bowers & Wilkins, Denon, and Marantz, Samsung has allowed Harman Kardon to maintain a modest and unobtrusive marketing approach. Despite this, the brand excels in creating speakers with minimalist designs and meticulous, dynamic sound quality that often impresses. Known for providing sound systems for car brands such as Volkswagen and Volvo, Harman Kardon applies the same expertise to its home speakers.
The Onyx Studio 9 embodies this philosophy with advanced technologies: acoustic environment adaptation, Bluetooth Auracast compatibility for multi-speaker streaming, and an 8-hour battery life. With a 50 W amplifier, it aims to deliver high-quality stereo sound whether in a living room, an office, or on a terrace. The listening experience offers pleasant surprises, living up to the expectations of this aptly named speaker.
Technical Specifications
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Harman Kardon Onyx Studio 9
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Amazon
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Boulanger
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Fnac
Best connected speakers
All Harman Kardon connected speakers
This review was conducted using a speaker provided by the manufacturer.
Refinement and Elegance
The Harman Kardon Onyx Studio 9 captivates with its refined and functional aesthetics. With a diameter of approximately 28 cm, it is shaped like a slightly inclined domed disk, resting on a discreet silicone foot, providing impeccable stability.
The front face, covered with a dark gray acoustic fabric, features a fine and elegant texture. This fabric, which also wraps around the back, gives the speaker a modern look. A brushed aluminum frame, in a satin metallic gray, surrounds the assembly and also serves as a handle.
At the top of the frame, an adhesive silicone control panel, in a matching shade, houses the physical controls. The buttons, slightly soft to the touch, manage power on/off, Bluetooth activation, volume adjustment, playback, and Auracast pairing for connecting multiple speakers.
A Welcome Auxiliary Line Input
At the back, the connectivity options are comprehensive and well thought-out. An embedded panel houses three ports: a socket for the power cable, with integrated power supply, a USB-C port for charging an external device with a maximum power of 10 W, and a mini-jack stereo auxiliary input for connecting analog sources like a music player, a radio, or even a vinyl turntable.
Advanced Acoustic Architecture
Beneath its sleek exterior, it boasts a sophisticated acoustic design. The front face houses five drivers, a rare configuration for a speaker of this size. The main driver, dedicated to bass and mid frequencies, measures 12 cm in diameter and works in tandem with a passive radiator. This setup, known as passive loading, amplifies very low frequencies without requiring a large volume of air inside the speaker, thus maintaining a compact form while delivering deep and impactful bass. Unlike sealed or bass-reflex tube systems, this approach ensures a more generous and well-controlled bass response.
For high frequencies, Harman Kardon chose three 2 cm dome tweeters made from fabric. One is positioned in the center, while the other two, placed in the beginnings of horn-shaped mounts oriented laterally, project the sound further and enhance spatialization.
The amplification, totaling 50 W, is suited to the size of the drivers and the residential use of the speaker, whether indoors in a living room or outdoors on a terrace.
Ease of Use and Sound that Adapts to the Space
The speaker is very easy to use. Although the Bluetooth connection does not support high-definition codecs such as aptX HD or LDAC, it relies on the universal SBC standard. This is sufficient for this type of speaker, as the quality of the drivers and amplification is more critical than the codecs.
The Bluetooth latency, perfectly compensated for watching a movie or a video, creates — as expected — a slight delay with video games. In this case, one can choose to use the Onyx’s line input to resolve this synchronization issue.
The Auracast technology, integrated into Bluetooth, allows connecting multiple Harman Kardon speakers for an expanded stereo or a multi-speaker system ideal for parties. This feature enhances the versatility of the speaker, which can switch from individual to more ambitious, even festive configurations.
The Harman Kardon One app enhances the user experience. It enables the pairing with other speakers for expanded stereo or multi-room streaming. The app also offers an equalizer with preset profiles and manual adjustments by frequency bands. The default sound signature, balanced and flawless, generally does not require adjustment, but audiophiles will appreciate the ability to customize the sound to their preferences.
An advantage of the Onyx Studio 9 is its automatic environmental adaptation system. Although Harman does not detail how this technology works, it appears that the speaker uses an integrated microphone to assess the level of ambient noise and adjust the bass and treble accordingly.
Unlike some systems that emit calibration sounds, this process is discreet and transparent for the user. The result is consistently intelligible and pleasant sound, whether the speaker is placed in a quiet office or a somewhat noisy terrace. This adaptability is reminiscent of the capabilities of Apple’s HomePod 2.
Sound Experience: Beyond Appearances
The Onyx Studio 9 impresses from the first notes. Its balanced sound signature reflects the brand’s expertise, with deep bass — but never overpowering — a natural midrange that enhances vocals, and silky highs that add just the right amount of brilliance without fatigue.
The most surprising aspect is its ability to reproduce subtle nuances — the slight scrape of a guitar string or the delicate attack of a piano. This precision creates a surprisingly vast soundstage for a speaker of this size. The two lateral tweeters contribute significantly, as they project sound to the sides, creating an almost surround effect that envelops the listener.
At moderate volume, it goes low enough to give a sense of depth and weight to impacts. At full power, about 90 dB at 1 m (which is more than enough to drown out conversation), the speaker loses some bass extension but remains perfectly stable in the mid and high frequencies, without distortion or compression.
With “Dancing Queen” by ABBA, it captures all the festive energy of the track, with the vocals standing out clearly and the orchestral arrangements seeming to extend all around. On “So What” by Miles Davis, the double bass resonates with convincing depth, the trumpet reveals many nuances, and the atmosphere becomes intimate. Even “Sweet Child O’ Mine” by Guns N’ Roses passes with flying colors — Slash’s intro is crystal clear and even at high volume, Axl Rose’s voice retains its energy without becoming harsh.
A Thoughtfully Studied Response Curve
The frequency response curve confirms the listening impressions. The blue line (mid-volume) extends down to 50 Hz in the bass, while the pink line (full power) shows that the electronics scale back and limit the bass extension to protect the main transducer from excessive membrane movement.
The midrange is balanced with a slight emphasis in the lower part of the register (300-400 Hz), which enhances the natural presence of voices. The critical range for our hearing, from 1 to 3 kHz, is judiciously recessed to prevent any harshness, even at high volumes (perfect). A slight peak around 6 kHz adds just enough brightness to cymbals and string instrument harmonics,
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Maya Singh is a senior editor covering tablets and hybrid devices. Her work explores how these tools reshape digital productivity and learning. She also contributes to feature editorials on emerging tech.