Short answer: the Onn Medium Party Speaker Gen 2. It ranks #65 of 112 boombox speakers by sound quality (rated 3.1/5) at $90 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 Onn Medium Party Speaker Gen 2 is the better-sounding, tougher option. An affordable waterproof party speaker with a big woofer, lights, a karaoke mic input and FM radio. It is rated IPX7, while the Diamondboxx M3 has no water resistance. It links with other speakers (Party Sync Mode), which the Diamondboxx M3 cannot. The tradeoff: Lacking detail compared to the Onn Large Party gen 2 and not as deep of bass.
The Diamondboxx M3 is the longer-running 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 20 for the Onn Medium Party Speaker Gen 2. It plays in stereo from a single unit, unlike the Onn Medium Party Speaker Gen 2. Watch for: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard.
Buy the Onn Medium Party Speaker Gen 2. It is rated higher for sound quality and still sold new, while the Diamondboxx M3 is discontinued.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
An affordable waterproof party speaker with a big woofer, lights, a karaoke mic input and FM radio.
A compact, very loud boombox with a powerful amplifier and a choice of large battery packs.
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Specifications Side By Side
| Onn Medium Party Speaker Gen 2 | Diamondboxx M3 | |
|---|---|---|
| Price | $90 | $700 Discontinued |
| Ranked | #65 of 112 in Boombox Size Portable Bluetooth Speakers | #76 of 112 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Battery Life | 20 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| FM Tuner | Yes (16 presets) | No |
| IP Rating | IPX7 | None |
| Microphone Input | Yes (Karaoke mode with echo effect) | - |
| Party Mode | Yes (Party Sync Mode) | No |
| Power Bank | Yes (USB-A, 5V/2.1A) | No |
| Power Input | AC Power cord | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | No | No |
| EQ | No | No |
| TWS | Yes | Yes |
| USB Playback | No | No |
| Built-in Microphone | No | No |
| Amplifier Power | 50W RMS / 200W peak | 200W RMS / 400W peak |
| Dimensions | 9.6” x 10.9” x 15.1” (244.1 x 277.9 x 383 mm) | 14.7” x 9” x 8” (373.4 x 228.6 x 203.2 mm) |
| Weight | 11 lbs (5 kg) | 11 lbs (5 kg) |
| Drivers | 8” (203mm) woofer + tweeters | 3” woofer + tweeter array |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Bluetooth Version | - | 5.0 |
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