Short answer: the Turtlebox Grande, if you are buying new, though neither ranks well in its class. The Diamondboxx M3 ranks higher than it (#66 vs #69 of 89 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 89 boombox speakers; for better sound, the Tribit Stormbox Blast ranks #2 at $179.99.
The case for the Diamondboxx M3: An unusually compact 5kg high-output boombox, with a claimed 200W RMS Class A/B amplifier, 114dB maximum level, active crossovers and a choice of large battery packs. The tradeoff: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard.
The case for the Turtlebox Grande: 10-inch woofer. 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.
There is a real gap in water resistance: the Turtlebox Grande at IP67 (brief submersion) against the Diamondboxx M3, which has no water resistance.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Diamondboxx M3 | Turtlebox Grande | |
|---|---|---|
| Price | $700 Discontinued | $730.00 |
| Ranked | #66 of 89 in Boombox Size Portable Bluetooth Speakers | #69 of 89 in Boombox Size Portable Bluetooth Speakers |
| 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 |
| Bluetooth Version | - | 5.4 |
| Strap | - | No |
Related Speaker Comparisons
More top alternatives to Diamondboxx M3:
- Tribit Stormbox Blast vs Diamondboxx M3
- JBL Partybox Encore 2 vs Diamondboxx M3
- JBL Partybox Encore Essential 2 vs Diamondboxx M3
- Diamondboxx M3 vs JBL Partybox Encore
- JBL Partybox Encore Essential vs Diamondboxx M3
Prices on this page were last checked September 29, 2026 at 3:43 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
Diamondboxx M3: $700 Discontinued eBay
Pros: An unusually compact 5kg high-output boombox, with a claimed 200W RMS Class A/B amplifier, 114dB maximum level, active crossovers and a choice of large battery packs. It has aux input, USB-C power and TWS pairing, while the aluminum heat sink is designed to sustain loud playback without thermal shutdown.
Cons: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard. The treble-forward tuning can sound aggressive, there is no app or EQ to correct it, and the lack of a water rating makes it a poor match for poolside or rough-weather use. Discontinued.
Full Diamondboxx M3 review and specifications →
| Amplifier Power | 200W RMS / 400W peak |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 14.7” x 9” x 8” (373.4 x 228.6 x 203.2 mm) |
| Drivers | 3” woofer + tweeter array |
| EQ | No |
| FM Tuner | No |
| IP Rating | None |
| Omnidirectional | No |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | No |
| Weight | 11 lbs (5 kg) |
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
- Diamondboxx M3 vs W-King D10
- Diamondboxx M3 vs Demerbox DB2
- Diamondboxx M3 vs Bumpboxx Flare 6
- Diamondboxx M3 vs EcoXGear Defender
- Diamondboxx M3 vs JBL Partybox On the Go
- Diamondboxx M3 vs Onn Medium Party Speaker Gen 2
- Diamondboxx M3 vs Marshall Tufton
- Diamondboxx M3 vs Soundcore Rave Party 2
- See all 44 comparisons
Turtlebox Grande: $730.00 Amazon eBay
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 →
| 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
- Turtlebox Grande vs Bumpboxx Flare 8
- Turtlebox Grande vs Bumpboxx Flare 6
- Turtlebox Grande vs EcoXGear Defender
- Turtlebox Grande vs Demerbox DB2
- Turtlebox Grande vs ZZA K8
- Turtlebox Grande vs Marshall Tufton
- Turtlebox Grande vs Soundcore Motion Boom+
- See all 78 comparisons