Short answer: the W-King X20. It ranks #43 of 112 boombox speakers by sound quality (rated 3.5/5) at $219.98 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 W-King X20 is the better-sounding, tougher choice. A loud stereo party speaker with a large subwoofer, a 24 hour battery with power bank, and water resistance. It is rated IPX6, while the Diamondboxx M3 has no water resistance. It has an adjustable EQ, which the Diamondboxx M3 lacks. The catch: Rising frequency response but upper treble rolled off, 700Hz and 1.2kHz peaks.
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 24 for the W-King X20. At 11 lbs (5 kg) it weighs noticeably less than the W-King X20 at 15.9 lbs (7.2 kg). The tradeoff: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard.
Buy the W-King X20. It is rated higher for sound quality; the Diamondboxx M3 is no longer sold new.
Looking for alternatives? See the complete Portable Bluetooth rankings.
A loud stereo party speaker with a large subwoofer, a 24 hour battery with power bank, and water resistance.
A compact, very loud boombox with a powerful amplifier and a choice of large battery packs.
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Specifications Side By Side
| W-King X20 | Diamondboxx M3 | |
|---|---|---|
| Price | $219.98 after coupon | $700 Discontinued |
| Ranked | #43 of 112 in Boombox Size Portable Bluetooth Speakers | #76 of 112 in Boombox Size Portable Bluetooth Speakers |
| App | Yes (W-King app) | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~42Hz | - |
| EQ | Yes (App + button modes) | No |
| IP Rating | IPX6 | None |
| Maximum SPL | 112dB (measured by Alan Ross Reviews) | - |
| MicroSD Playback | Yes | - |
| Power Bank | Yes (USB-A) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Party Mode | No | No |
| Built-in Microphone | No | No |
| Amplifier Power | 330W peak / 200W RMS | 200W RMS / 400W peak |
| Dimensions | 19.9” x 8.5” x 10.6” (506 x 217 x 270 mm) | 14.7” x 9” x 8” (373.4 x 228.6 x 203.2 mm) |
| Drivers | 7.5” subwoofer + drivers | 3” woofer + tweeter array |
| Weight | 15.9 lbs (7200 g) | 11 lbs (5 kg) |
| Digital Aux Input | No | No |
| Battery Life | 24 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth Version | 5.4 | 5.0 |
| FM Tuner | - | No |
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