Short answer: the Harman Kardon Onyx Studio 7. It ranks #14 of 91 boombox speakers by sound quality, rated 4.1/5, at $248.90. The Ruimatech RM-10 ranks #29, rated 3.8/5, at $159.99, $88.91 cheaper, not enough of a saving to outweigh the sound-quality gap.
Why pick the Harman Kardon Onyx Studio 7: The addition of dual tweeters gives the Studio 7 a wider, more spacious presentation than older Onyx models. The catch: Consumer Reports finds the bass prominent and boomy, mids hazy, treble slightly smeared and the soundstage congested.
The Ruimatech RM-10 is the longer-running, tougher option. 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. It is rated for 14 hours of battery against 8 for the Harman Kardon Onyx Studio 7. It is rated IPX6, while the Harman Kardon Onyx Studio 7 has no water resistance. Watch for: It is tuned bass boosted, much like the JBL Boombox 3.
Buy the Harman Kardon Onyx Studio 7. It is rated higher for sound quality, and the $88.91 saving on the Ruimatech RM-10 is not enough to make up the difference.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Harman Kardon Onyx Studio 7 | Ruimatech RM-10 | |
|---|---|---|
| Price | $248.90 | $159.99 |
| Ranked | #14 of 91 in Boombox Size Portable Bluetooth Speakers | #29 of 91 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | - |
| Aux Latency | 0ms | - |
| Bass Extension (-10dB) | 37Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | 14 hours at 30% volume (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| IP Rating | None | IPX6 |
| Bluetooth Latency | 266ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Wireless Dual Sound) | - |
| Power Input | DC Barrel Connector (19V/2.1A) | - |
| Stereo | Partially (1 woofer) | Partially |
| Omnidirectional | No | No |
| TWS | No | Yes |
| Weight | 6.4 lbs (2.9 kg) | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | - |
| App | No | No |
| EQ | No | - |
| Power Bank | No | Yes (USB-C) |
| USB Playback | No | - |
| Amplifier Power | 50W RMS | 140W RMS (300W peak) |
| Dimensions | 11.3” x 11.3” (285.8 x 285.8 mm) (round design) | - |
| Drivers | 120mm woofer + 2x 25mm tweeters | 80W woofer + 2x 20W midranges + 2x 10W tweeters + 2 passive radiators |
| Digital Aux Input | No | - |
| Bluetooth Version | 4.2 | 5.3 |
| Strap | No | No |
Related Speaker Comparisons
More worthwhile head-to-heads for Harman Kardon Onyx Studio 7:
- Tribit Stormbox Blast vs Harman Kardon Onyx Studio 7
- Harman Kardon Go + Play 3 vs Harman Kardon Onyx Studio 7
- JBL Partybox Encore 2 vs Harman Kardon Onyx Studio 7
- JBL PartyBox On-The-Go 2 Plus vs Harman Kardon Onyx Studio 7
- JBL Partybox Encore Essential 2 vs Harman Kardon Onyx Studio 7
Prices on this page were last checked October 4, 2026 at 9:58 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 7: $248.90 Amazon eBay
Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5.
Pros: The addition of dual tweeters gives the Studio 7 a wider, more spacious presentation than older Onyx models. It delivers strong, deep bass, useful large-room volume and can pair with a second Studio 7 for stereo. Measured bass extension of 37Hz (-10dB).
Cons: Consumer Reports finds the bass prominent and boomy, mids hazy, treble slightly smeared and the soundstage congested. Battery life remains only about eight hours, it has no water rating or advanced codecs, and it is not an especially loud outdoor speaker.
Full Harman Kardon Onyx Studio 7 review and specifications →
| Amplifier Power | 50W RMS |
|---|---|
| App | No |
| Aux Input | Yes |
| Aux Latency | 0ms |
| Bass Extension (-10dB) | 37Hz |
| Battery Life | 8 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 266ms |
| Bluetooth Version | 4.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 11.3” x 11.3” (285.8 x 285.8 mm) (round design) |
| Drivers | 120mm woofer + 2x 25mm tweeters |
| EQ | No |
| IP Rating | None |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| Omnidirectional | No |
| Party Mode | Yes (Wireless Dual Sound) |
| Power Bank | No |
| Power Input | DC Barrel Connector (19V/2.1A) |
| Stereo | Partially (1 woofer) |
| Strap | No |
| TWS | No |
| USB Playback | No |
| Weight | 6.4 lbs (2.9 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Alan Ross Reviews: JBL Boombox 2 vs Onyx Studio 7 big bass battle 💋 More from alanrossreviews →
- Alan Ross Reviews: Onyx Studio 7 vs Onyx Studio 6 - massive deep bass battle 😁
- Geri’s Collection: Harman Kardon Onyx 7 vs Onyx 4
- KULAS TECH SHOW: Harman / Kardon Onyx Studio 5 vs Onyx Studio 7 - Close battle🔥🔥 More from KULASTECHSHOW20 →
- 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
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- Ruimatech RM-10 vs W-King H330
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