Short answer: the Turtlebox Grande, if you are buying new, though neither ranks well in its class. The Diamondboxx M3 ranks higher than it (#77 vs #81 of 113 boombox speakers, 2.8/5 vs 2.6/5) but is discontinued, so only consider it used; the Turtlebox Grande is still sold new at $730. Both are rated below 3.0/5 among the 113 boombox speakers; for better sound, the Tribit Stormbox Blast ranks #2 at $199.99.
The Diamondboxx M3 is the longer-running, lighter option. A compact, very loud boombox with a powerful amplifier and a choice of large battery packs. It is rated for 40 hours of battery against 25 for the Turtlebox Grande. At 11 lbs (5 kg) it weighs much less than the Turtlebox Grande at 18.8 lbs (8.53 kg). The catch: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard.
The Turtlebox Grande is the tougher choice. A rugged, submersible, crush-proof speaker with a 10 inch woofer and a battery that lasts for days. It is rated IP67, while the Diamondboxx M3 has no water resistance. It links with other speakers (Turtlebox Party Mode), which the Diamondboxx M3 cannot. Watch for: In YouTube sound samples it sounds only okay, and bass is shallow for a 10 inch woofer, only down 10dB at about 55Hz.
Buy the Turtlebox Grande, since the Diamondboxx M3 is discontinued and only worth hunting down used.
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Specifications Side By Side
| Diamondboxx M3 | Turtlebox Grande | |
|---|---|---|
| Price | $700 Discontinued | $730.00 |
| Ranked | #77 of 113 in Boombox Size Portable Bluetooth Speakers | #81 of 113 in Boombox Size Portable Bluetooth Speakers |
| Bluetooth Version | 5.0 | 5.4 |
| Aux Input | Yes | Yes |
| Battery Life | 40 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| IP Rating | None | IP67 |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 11 lbs (5 kg) | 18.8 lbs (8.53 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | No | No |
| EQ | No | No |
| TWS | Yes | Yes |
| Party Mode | No | Yes (Turtlebox Party Mode) |
| Power Bank | No | Yes (USB-C) |
| USB Playback | No | No |
| Built-in Microphone | No | Yes |
| Power Input | USB-C | DC Barrel Connector (20V/3A) |
| FM Tuner | No | - |
| Amplifier Power | 200W RMS / 400W peak | 86W |
| Dimensions | 14.7” x 9” x 8” (373.4 x 228.6 x 203.2 mm) | 14” x 8.4” x 11.5” (355.6 x 213.4 x 292.1 mm) |
| Drivers | 3” woofer + tweeter array | 1x 10” (254mm) woofer + 1x 1.25” (32mm) titanium tweeter |
| Digital Aux Input | No | No |
| Bass Extension (-10dB) | - | ~55Hz |
| MicroSD Playback | - | Yes |
| Strap | - | No |
Where the Ratings Come From
- Diamondboxx M3: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
- Turtlebox Grande: reviews by Everyday Man, Cast South and R J.
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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