Harman Kardon Onyx Studio 9

Name: Harman Kardon Onyx Studio 9
Brand: Harman Kardon
SKU: 93900

Manufacturer: Harman Kardon

The Harman Kardon Onyx Studio 9 is a sizeable portable speaker designed for home and on-the-go listening, built around a three-driver configuration and a total audio output power of 4 x 12.5W. It connects wirelessly via Bluetooth 5.3 and includes a detachable cable measuring 2 m in length, giving users some flexibility in how they set it up. Stereo pairing is supported, allowing two units to be linked together for a wider soundstage.

Measuring 287.5 mm in height, 289.2 mm in width, and 130 mm in thickness, the Onyx Studio 9 has a volume of 10808.85 cm³ and tips the scales at 3330 g. Its 4722 mAh rechargeable battery delivers up to 8 hours of playback on a single charge, with a full charge taking approximately 4 hours via USB Type-C. The speaker covers a frequency range of 50 Hz to 20000 Hz, carries a signal-to-noise ratio of 80 dB, and notably includes Auracast support alongside voice prompts and smartphone remote control functionality.

Pros

Supports Auracast, allowing audio to be broadcast to multiple listeners simultaneously
Stereo pairing lets two units be linked together for a wider soundstage
Bluetooth 5.3 provides a modern and stable wireless connection
Includes a detachable cable of 2 m, adding flexibility in wired setup options
Voice prompts assist with device status and navigation without needing a screen
Smartphone remote control support allows playback management from a paired device

Cons

No water resistance, making it unsuitable for outdoor or wet environments
At 3330 g, the weight makes it less practical to carry around frequently
Battery life of 8 hours is relatively limited for extended listening sessions
No battery level indicator, so remaining charge is not directly visible to the user
Bluetooth range is capped at 10 m, restricting movement while connected
No advanced audio codec support such as aptX, LDAC, or AAC, limiting wireless audio quality options

Who is this for?

This speaker suits users who primarily listen at home or in fixed indoor settings, where its substantial size and weight are not a concern and a stable surface can support the 3330 g build. Those who want to expand their setup will appreciate the stereo pairing capability, which allows two units to be connected for a broader soundstage. The inclusion of Auracast also makes it a reasonable fit for users who want to share audio with multiple listeners in the same space simultaneously.

Who is this NOT for?

Users looking for a truly portable speaker will find the 3330 g weight and large dimensions impractical for frequent travel or outdoor use, especially given the complete absence of water resistance. Those who rely on extended listening sessions may be frustrated by the 8-hour battery ceiling with no wireless charging to top up conveniently. Audiophiles seeking high-fidelity wireless audio will also be disappointed, as the speaker lacks any advanced codec support including LDAC, aptX, and AAC, limiting the wireless audio transmission quality achievable from compatible source devices.

Design:

volume	10808.85 cm³
drivers count	3
driver unit size	20 mm
has a neodymium magnet	✕
water resistance	None
travel bag is included	✕
has a touch screen	✕
has RGB lighting	✕
has a detachable cable	✓
is a neckband speaker	✕
has a remote control	✕
weight	3330 g
height	287.5 mm
width	289.2 mm
thickness	130 mm

The Harman Kardon Onyx Studio 9 has a substantial physical footprint, measuring 287.5 mm in height, 289.2 mm in width, and 130 mm in thickness, with a total volume of 10808.85 cm³ and a weight of 3330 g. It houses three drivers, each 20 mm in size, and comes with a detachable cable for added convenience. The speaker does not feature water resistance, a neodymium magnet, RGB lighting, a touch screen, a remote control, or a travel bag, and it is not designed as a neckband speaker.

Sound quality:

has stereo speakers	✕
has a subwoofer	✕
highest frequency	20000 Hz
lowest frequency	50 Hz
audio output power	4 x 12.5W
Has a passive radiator	✕
has a noise-canceling microphone	✕
Signal-to-noise ratio (SNR)	80 dB
has a magnetic shielding	✕

The Onyx Studio 9 delivers a total audio output power of 4 x 12.5W and covers a frequency range spanning from 50 Hz up to 20000 Hz, with a signal-to-noise ratio of 80 dB. It does not include stereo speakers, a subwoofer, or a passive radiator, nor does it feature a noise-canceling microphone or magnetic shielding.

Power:

battery power	4722 mAh
Battery life	8 hours
charge time	4 hours
has a battery level indicator	✕
has a rechargeable battery	✓
has a removable battery	✕
has wireless charging	✕

The Onyx Studio 9 is powered by a built-in rechargeable 4722 mAh battery that provides up to 8 hours of playback on a full charge, which itself takes around 4 hours to complete. The battery is not removable, and the speaker does not support wireless charging or include a battery level indicator.

Connectivity:

Bluetooth version	5.3
supports Bluetooth pairing using NFC	✕
has a socket for a 3.5 mm audio jack	✕
has an AUX input	✕
has aptX Lossless	✕
has LDAC	✕
has aptX Adaptive	✕
has aptX HD	✕
has aptX	✕
has aptX Low Latency	✕
has AAC	✕
has AirPlay	✕
has Chromecast built-in	✕
has Auracast	✓
has Bluetooth LE Audio	✕
maximum Bluetooth range	10 m
supports Wi-Fi	✕
Has USB Type-C	✓
has a 3.5mm male connector	✕
has an external memory slot	✕
is DLNA-certified	✕
supports Ethernet	✕
has a microphone input	✕

The Onyx Studio 9 connects wirelessly via Bluetooth 5.3 with a maximum range of 10 m, and notably supports Auracast for broadcast audio sharing. It also includes a USB Type-C port, though it does not offer Wi-Fi, Ethernet, AirPlay, Chromecast, DLNA, or NFC pairing. On the audio codec side, none of the advanced options are present — aptX, aptX HD, aptX Adaptive, aptX Lossless, aptX Low Latency, LDAC, AAC, and Bluetooth LE Audio are all absent. There is no 3.5 mm audio jack socket, no AUX input, no 3.5 mm male connector, no external memory slot, and no microphone input.

Features:

Can be used wirelessly	✓
supports a remote smartphone	✓
has fast pairing	✕
has voice commands	✕
Has a radio	✕
Has voice prompts	✓
has a mute function	✕
works as a power bank	✕

The Onyx Studio 9 can be used wirelessly and supports smartphone remote control, allowing playback management from a paired device. It also includes voice prompts to assist with navigation and status feedback. Fast pairing, voice commands, a mute function, and radio are not available, and the speaker cannot function as a power bank.

Miscellaneous:

supports pairing for stereo sound	✓
cable length	2 m

The Onyx Studio 9 supports stereo pairing, enabling two units to be linked together for a wider stereo sound experience, and comes with a cable measuring 2 m in length.

Final Verdict

The Harman Kardon Onyx Studio 9 is a home-oriented portable speaker that positions itself around room-filling sound and multi-unit flexibility rather than on-the-go convenience. Its Auracast support and stereo pairing capability stand out as genuinely useful features for shared listening environments, and Bluetooth 5.3 ensures a stable wireless connection within its 10 m range. That said, the considerable weight, absence of water resistance, limited battery life, and lack of advanced audio codec support mean it is best suited to stationary indoor use rather than active or travel-focused scenarios. For listeners who want a sizeable speaker anchored to a fixed listening space and value broadcast audio sharing, the Onyx Studio 9 delivers a coherent and well-defined feature set — provided its portability constraints are accepted from the outset.