Short answer: both are discontinued, so this only matters if you are buying used. Used, the Harman Kardon Onyx Studio 4 is the better pick: it ranks #73 of 126 large speakers by sound quality (rated 3.3/5), against #100 (rated 2.7/5) for the Bogasing S8 Pro. If you want one new, the Bogasing S8 Pro Max replaces the Bogasing S8 Pro and is rated 4.2/5 at $169.99.
The Harman Kardon Onyx Studio 4 is the better-sounding option. A stylish round home speaker with a premium look that can connect two phones at once, now discontinued. It links with other speakers (Connect+ up to 100 speakers), which the Bogasing S8 Pro cannot. Watch for: 8 hour battery at medium volume.
The Bogasing S8 Pro is the longer-running, lighter option. A compact stereo speaker with splash resistance, USB-C charging, microSD playback, and stereo pairing, now discontinued. It is rated for 15 hours of battery against 8 for the Harman Kardon Onyx Studio 4. At 3.4 lbs (1.55 kg) it weighs noticeably less than the Harman Kardon Onyx Studio 4 at 4.5 lbs (2.06 kg). It is rated IPX5, while the Harman Kardon Onyx Studio 4 has no water resistance. The tradeoff: Its sound modes are the limiting factor: most have large treble peaks that make cymbals and sibilants sound sizzling or harsh, while even Vocal mode is only moderately balanced.
Buy the Harman Kardon Onyx Studio 4 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, buy the Bogasing S8 Pro Max, which replaces the Bogasing S8 Pro.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| Harman Kardon Onyx Studio 4 | Bogasing S8 Pro | |
|---|---|---|
| Price | $100 Discontinued | $152 Discontinued |
| Ranked | #73 of 126 in Large Size Portable Bluetooth Speakers | #100 of 126 in Large Size Portable Bluetooth Speakers |
| App | Yes (HK Connect) | No |
| Aux Input | Yes | Yes |
| Battery Life | 8 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| EQ | No | No |
| IP Rating | None | IPX5 |
| Party Mode | Yes (Connect+ up to 100 speakers) | No |
| Power Bank | No | No |
| TWS | Yes | Yes |
| Weight | 4.5 lbs (2.06 kg) | 3.4 lbs (1.55 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | Yes |
| Power Input | DC Barrel Connector (19V/2.1A) | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Bluetooth Version | 4.2 | 5.0 |
| Drivers | 2x 75mm woofers + 2x 20mm tweeters + 1x passive radiator | 60W: Dual drivers + passive radiator |
| Dimensions | 11.4” x 11.4” x 5.1” (290 x 290 x 130 mm) | 10.7” x 2.1” x 2.9” (271 x 53 x 73 mm) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | 48Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | 60W | 60W |
| Digital Aux Input | No | No |
| Strap | No | - |
| MicroSD Playback | - | Yes |
Where the Ratings Come From
- Harman Kardon Onyx Studio 4: reviews by Alan Ross, Geri’s Collection and OCM.
- Bogasing S8 Pro: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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