Short answer: the Soundcore Boom 2 Plus. It ranks #39 of 112 boombox speakers by sound quality (rated 3.6/5) at $169.99 and is still sold new; the Diamondboxx M3 ranks #76 (rated 2.8/5) and is discontinued, so it is only an option used.
The Soundcore Boom 2 Plus is the better-sounding, lighter option. A fairly light stereo boombox, easy to carry to the beach or park. At 8.4 lbs (3.8 kg) it weighs noticeably less than the Diamondboxx M3 at 11 lbs (5 kg). It is rated IPX7, while the Diamondboxx M3 has no water resistance. It supports AAC Bluetooth, which the Diamondboxx M3 lacks. Watch for: Warm tuning meaning a rolled off treble and some upper bass boost.
The Diamondboxx M3 is the longer-running choice. 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 20 for the Soundcore Boom 2 Plus. The tradeoff: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard.
Buy the Soundcore Boom 2 Plus. It is rated higher for sound quality, and the Diamondboxx M3 is discontinued, so it is only available used.
Want more options? Browse the full Portable Bluetooth rankings.
A fairly light stereo boombox, easy to carry to the beach or park.
A compact, very loud boombox with a powerful amplifier and a choice of large battery packs.
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Specifications Side By Side
| Soundcore Boom 2 Plus | Diamondboxx M3 | |
|---|---|---|
| Price | $169.99 | $700 Discontinued |
| Ranked | #39 of 112 in Boombox Size Portable Bluetooth Speakers | #76 of 112 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 39Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| EQ | Yes (Pro EQ + presets) | No |
| IP Rating | IPX7 | None |
| Maximum SPL | 111dB (measured by Alan Ross Reviews) | - |
| MicroSD Playback | No | - |
| Party Mode | Yes (PartyCast 2.0) | No |
| Power Bank | Yes (USB-C, 5V/2A) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 8.4 lbs (3.8 kg) | 11 lbs (5 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, AAC | SBC |
| USB Playback | No | No |
| Built-in Microphone | Yes | No |
| Amplifier Power | 140W | 200W RMS / 400W peak |
| Dimensions | 17.3” x 9.1” x 5.9” (440 x 230 x 150 mm) | 14.7” x 9” x 8” (373.4 x 228.6 x 203.2 mm) |
| Drivers | 2x 114mm (4.5”) woofers + 2x 19mm (0.75”) tweeters | 3” woofer + tweeter array |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Bluetooth Version | 5.3 | 5.0 |
| Strap | Yes (detachable strap) | - |
| FM Tuner | - | No |
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