Short answer: the Ruimatech RM-10, if you are buying new. The Harman Kardon Onyx Studio 8 ranks higher than it (#12 vs #28 of 89 boombox speakers, 4.1/5 vs 3.8/5) but is discontinued, so only consider it used; the Ruimatech RM-10 is still sold new at $159.99.
Why pick the Harman Kardon Onyx Studio 8: At 3.3 kg, Harman Kardon Onyx Studio 8 combines a 120mm woofer and 2x 20mm tweeters with Bluetooth and aux. The catch: Bass is limited by its 35Hz specification.
What the Ruimatech RM-10 does well: A three-way boombox (80W woofer, two 20W midranges, two 10W tweeters and dual passive radiators, 140W RMS) with a hi-fi leaning clarity, highs that don’t get screechy at max volume, and bass that holds on at full volume. Watch for: It is tuned bass boosted, much like the JBL Boombox 3.
Buy the Ruimatech RM-10, since the Harman Kardon Onyx Studio 8 is discontinued and only worth hunting down used.
There is a real battery-life gap here: the Ruimatech RM-10 is rated for 14 hours, the Harman Kardon Onyx Studio 8 only 8 hours.
If water resistance matters to you, the Ruimatech RM-10 at IPX6 (powerful water jets) holds up far better than the Harman Kardon Onyx Studio 8 at no water resistance.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Harman Kardon Onyx Studio 8 | Ruimatech RM-10 | |
|---|---|---|
| Price | $197.90 Discontinued | $159.99 |
| Ranked | #12 of 89 in Boombox Size Portable Bluetooth Speakers | #28 of 89 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | - |
| Aux Latency | 42ms | - |
| Bass Extension (-10dB) | 35Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | 14 hours at 30% volume (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| IP Rating | None | IPX6 |
| Bluetooth Latency | 175ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Power Input | DC Barrel Connector (19V/2.1A) | - |
| Stereo | Partially (1 woofer) | Partially |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 7.3 lbs (3.3 kg) | - |
| App | Yes (Harman Kardon One app) | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | - |
| Power Bank | No | Yes (USB-C) |
| EQ | Yes (App EQ) | - |
| Party Mode | No | - |
| USB Playback | No | - |
| Bluetooth Version | 5.2 | 5.3 |
| Amplifier Power | 50W RMS | 140W RMS (300W peak) |
| Dimensions | 10.6” x 11.9” x 6.3” (268 x 302.5 x 159.5 mm) | - |
| Drivers | 120mm woofer + 2x 20mm tweeters | 80W woofer + 2x 20W midranges + 2x 10W tweeters + 2 passive radiators |
| Digital Aux Input | No | - |
| Strap | No | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Harman Kardon Onyx Studio 8:
- Tribit Stormbox Blast vs Harman Kardon Onyx Studio 8
- Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore 2 vs Harman Kardon Onyx Studio 8
- JBL PartyBox On-The-Go 2 Plus vs Harman Kardon Onyx Studio 8
- JBL Partybox Encore Essential 2 vs Harman Kardon Onyx Studio 8
Prices on this page were last checked September 30, 2026 at 2:57 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Harman Kardon Onyx Studio 8: $197.90 Discontinued Amazon eBay
Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5.
Pros: At 3.3 kg, Harman Kardon Onyx Studio 8 combines a 120mm woofer and 2x 20mm tweeters with Bluetooth and aux. Claimed 8 hours (manufacturer specified) battery life and up to 96db make its feature set practical for its intended room or portable use. A built-in microphone and the Harman Kardon One app with EQ. Measured bass extension of 35Hz (-10dB).
Cons: Bass is limited by its 35Hz specification. Warm tuning with boosted bass, not as loud as others, and no water resistance rating. Discontinued.
Full Harman Kardon Onyx Studio 8 review and specifications →
| Amplifier Power | 50W RMS |
|---|---|
| App | Yes (Harman Kardon One app) |
| Aux Input | Yes |
| Aux Latency | 42ms |
| Bass Extension (-10dB) | 35Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 175ms |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 10.6” x 11.9” x 6.3” (268 x 302.5 x 159.5 mm) |
| Drivers | 120mm woofer + 2x 20mm tweeters |
| EQ | Yes (App EQ) |
| IP Rating | None |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Partially (1 woofer) |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: Harman Kardon Onyx Studio 8 review - part 2 of 3 More from alanrossreviews →
- Alan Ross Reviews: Onyx Studio 8 vs HK Onyx 6, Xtreme 3, PartyBox Encore, Go+ Play, Bag of Riddim! part 3 of 3
- Alan Ross Reviews: Dead room vs Live room - Onyx studio 8 self tuning test! part 1 of 3
- Alan Ross Reviews: Ultimate HK Onyx Studio speaker review and comparison! 8 speakers!
- Head-to-Head Comparisons
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Ruimatech RM-10: $159.99 Amazon eBay
Pros: A three-way boombox (80W woofer, two 20W midranges, two 10W tweeters and dual passive radiators, 140W RMS) with a hi-fi leaning clarity, highs that don’t get screechy at max volume, and bass that holds on at full volume. Side by side it beat the W-King X20S and X20 and sounded as good as the Tribit Stormbox Blast 2, especially at higher volume. IPX6, a claimed 14 hours, a USB-C power bank, 30W fast charging and stereo pairing.
Cons: It is tuned bass boosted, much like the JBL Boombox 3. There is no app or custom EQ and no shoulder strap, and the design is plain.
Full Ruimatech RM-10 review and specifications →
| Amplifier Power | 140W RMS (300W peak) |
|---|---|
| App | No |
| Battery Life | 14 hours at 30% volume (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Version | 5.3 |
| Drivers | 80W woofer + 2x 20W midranges + 2x 10W tweeters + 2 passive radiators |
| IP Rating | IPX6 |
| Omnidirectional | No |
| Power Bank | Yes (USB-C) |
| Stereo | Partially |
| Strap | No |
| TWS | Yes |
- Reviews, Comparisons and Sound Samples
- Jagist reviews: Ruimatech RM-10 Vs W-king X20!!! Battle Of Affordability!!! More from Jagistreviews →
- Jagist reviews: Ruimatech RM-10 Vs W-king X20s!!! Battle Of The Affordable’s!!!
- Jagist reviews: Tribit Stormbox Blast 2 Firmware 11 Vs Ruimatech RM-10!!! Battle Of The 3 Ways!!!
- Josh’s Gadgets and More: JBL Boombox 3 Wifi vs Ruimatech RM-10
- Head-to-Head Comparisons
- Ruimatech RM-10 vs W-King X20S
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- Ruimatech RM-10 vs JBL Boombox 3 Wifi
- Ruimatech RM-10 vs W-King H330
- Ruimatech RM-10 vs Soundcore Boom 2 Plus
- Ruimatech RM-10 vs JBL Boombox 4
- Ruimatech RM-10 vs W-King X20
- See all 23 comparisons