Short answer: the JBL Authentics 300. It ranks #46 of 112 boombox speakers by sound quality (rated 3.5/5) at $299.95 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 JBL Authentics 300 is the better-sounding pick. A retro styled smart speaker with both Alexa and Google Assistant, a leather handle and battery power. It links with other speakers (Wi-Fi Multi-Room), which the Diamondboxx M3 cannot. It has an adjustable EQ, which the Diamondboxx M3 lacks. The catch: Narrow sounding, bass not as deep as others.
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 8 for the JBL Authentics 300. It keeps a wired aux input, which the JBL Authentics 300 lacks. The catch: Despite its output, bass does not reach as deep as the best large portables and can distort when pushed hard.
Buy the JBL Authentics 300. 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 retro styled smart speaker with both Alexa and Google Assistant, a leather handle and battery power.
A compact, very loud boombox with a powerful amplifier and a choice of large battery packs.
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Specifications Side By Side
| JBL Authentics 300 | Diamondboxx M3 | |
|---|---|---|
| Price | $299.95 | $700 Discontinued |
| Ranked | #46 of 112 in Boombox Size Portable Bluetooth Speakers | #76 of 112 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 45Hz | - |
| Battery Life | 8 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| EQ | Yes (App EQ) | No |
| IP Rating | None | None |
| Maximum SPL | 100dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Wi-Fi Multi-Room) | No |
| Power Input | AC Power cable | USB-C |
| Stereo | Partially (1 woofer) | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 10.8 lbs (4.9 kg) | 11 lbs (5 kg) |
| Wi-Fi | Yes | - |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Power Bank | No | No |
| USB Playback | Yes | No |
| Built-in Microphone | Yes | No |
| MicroSD Playback | No | - |
| Aux Input | No | Yes |
| Amplifier Power | 100W | 200W RMS / 400W peak |
| Dimensions | 13.5” x 7.7” x 7.1” (342 x 195.6 x 180.3 mm) | 14.7” x 9” x 8” (373.4 x 228.6 x 203.2 mm) |
| Drivers | 1” tweeter + 4” woofer + passive radiators | 3” woofer + tweeter array |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.0 |
| Voice Assistants | Amazon Alexa & Google Assistant (simultaneous) | - |
| Strap | No | - |
| FM Tuner | - | No |
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