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 Turtlebox Grande ranks #71, rated 2.6/5, and costs $730, so there is not much of a tradeoff to weigh.
The Turtlebox Grande is the longer-running, tougher pick. 10-inch woofer. It is rated for 25 hours of battery against 8 for the Harman Kardon Onyx Studio 7. It is rated IP67, while the Harman Kardon Onyx Studio 7 has no water resistance. The catch: In YouTube sound samples it sounds only okay, and bass is shallow for a 10 inch woofer, only down 10dB at about 55Hz.
The Harman Kardon Onyx Studio 7 is the better-sounding, deeper-bass option. The addition of dual tweeters gives the Studio 7 a wider, more spacious presentation than older Onyx models. Its bass reaches about 37Hz before falling 10dB, against 55Hz for the Turtlebox Grande. At 6.4 lbs (2.9 kg) it weighs much less than the Turtlebox Grande at 18.8 lbs (8.53 kg). Watch for: Consumer Reports finds the bass prominent and boomy, mids hazy, treble slightly smeared and the soundstage congested.
Buy the Harman Kardon Onyx Studio 7. It is rated higher for sound quality than the Turtlebox Grande and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Turtlebox Grande | Harman Kardon Onyx Studio 7 | |
|---|---|---|
| Price | $730.00 | $248.90 |
| Ranked | #71 of 91 in Boombox Size Portable Bluetooth Speakers | #14 of 91 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~55Hz | 37Hz |
| Battery Life | 25 hours (Manufacturer specified) | 8 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| IP Rating | IP67 | None |
| MicroSD Playback | Yes | - |
| Party Mode | Yes (Turtlebox Party Mode) | Yes (Wireless Dual Sound) |
| Power Input | DC Barrel Connector (20V/3A) | DC Barrel Connector (19V/2.1A) |
| Stereo | Yes | Partially (1 woofer) |
| Omnidirectional | No | No |
| TWS | Yes | No |
| Weight | 18.8 lbs (8.53 kg) | 6.4 lbs (2.9 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | No | No |
| EQ | No | No |
| Power Bank | Yes (USB-C) | No |
| USB Playback | No | No |
| Bluetooth Version | 5.4 | 4.2 |
| Amplifier Power | 86W | 50W RMS |
| Dimensions | 14” x 8.4” x 11.5” (355.6 x 213.4 x 292.1 mm) | 11.3” x 11.3” (285.8 x 285.8 mm) (round design) |
| Drivers | 1x 10” (254mm) woofer + 1x 1.25” (32mm) titanium tweeter | 120mm woofer + 2x 25mm tweeters |
| Digital Aux Input | No | No |
| Strap | No | No |
| Aux Latency | - | 0ms |
| Bluetooth Latency | - | 266ms |
| Maximum SPL | - | 96dB (measured by Alan Ross Reviews) |
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 9, 2026 at 8:01 AM 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
Turtlebox Grande: $730.00 Amazon eBay
Same family: the Turtlebox Cub (smaller model, rated 3/5), the Turtlebox Ranger (smaller model, rated 3.5/5) and the Turtlebox Gen 3 (smaller model, ranked lower, rated 2.1/5). See every Turtlebox generation.
Pros: 10-inch woofer. IP67 submersible shell with crush-proof ABS exterior. 158Wh battery provides ~3 days of playback. Bluetooth 5.4, party mode (100+ speakers). Measured bass extension of ~55Hz (-10dB).
Cons: In YouTube sound samples it sounds only okay, and bass is shallow for a 10 inch woofer, only down 10dB at about 55Hz. It is rated at just 86W, and like the smaller Turtleboxes it won’t reach its claimed 126dB at a standard one meter distance. Expensive for what it delivers. It charges only from its own barrel plug adapter, not USB-C.
Full Turtlebox Grande review and specifications →
| Released | Jan 2025 (1 year ago) |
|---|---|
| Amplifier Power | 86W |
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~55Hz |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.4 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 14” x 8.4” x 11.5” (355.6 x 213.4 x 292.1 mm) |
| Drivers | 1x 10” (254mm) woofer + 1x 1.25” (32mm) titanium tweeter |
| EQ | No |
| IP Rating | IP67 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | Yes (Turtlebox Party Mode) |
| Power Bank | Yes (USB-C) |
| Power Input | DC Barrel Connector (20V/3A) |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| USB Playback | No |
| Weight | 18.8 lbs (8.53 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Turtlebox Grande vs W-King D10
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Harman Kardon Onyx Studio 7: $248.90 Amazon eBay
Newer model: the Harman Kardon Onyx Studio 9, ranked lower, rated 4.1/5, released Dec 2024.
Older models: the Harman Kardon Onyx Studio 6 (ranked higher, rated 4.1/5), the Harman Kardon Onyx Studio 5 (ranked lower, rated 3.9/5) and the Harman Kardon Onyx Studio 4 (rated 3.3/5). See every Harman Kardon Onyx Studio generation.
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 →
| Released | Jan 2021 (5 years ago) |
|---|---|
| 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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