Short answer: the Yeahbox Sonic Boom Ultra. It ranks #11 of 112 boombox speakers by sound quality, rated 4.2/5, at $388; the Turtlebox Gen 3 ranks #104, rated 2.1/5, and costs $430, so there is little reason to consider the other one.
The Turtlebox Gen 3 is the lighter choice. A loud, waterproof and crushproof outdoor speaker with a big battery, device charging and party mode linking. At 10 lbs (4.54 kg) it weighs much less than the Yeahbox Sonic Boom Ultra at 24.3 lbs (11 kg). It links with other speakers (Turtlebox Party Mode), which the Yeahbox Sonic Boom Ultra cannot. The catch: Sounds basically identical to the original and the Turtlebox Gen 2: each generation mainly added features, not sound quality.
The Yeahbox Sonic Boom Ultra is the better-sounding choice. A massively loud boombox with deep bass, long battery life, and HDMI ARC so it can double as a TV soundbar. It has an adjustable EQ, which the Turtlebox Gen 3 lacks. The catch: The 500W peak-power rating doesn’t fully hold up: it gets noisy above roughly 80-90% volume, and the midrange isn’t fully refined, sometimes sitting a touch too forward.
Buy the Yeahbox Sonic Boom Ultra. It is rated higher for sound quality than the Turtlebox Gen 3 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A loud, waterproof and crushproof outdoor speaker with a big battery, device charging and party mode linking.
A massively loud boombox with deep bass, long battery life, and HDMI ARC so it can double as a TV soundbar.
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Specifications Side By Side
| Turtlebox Gen 3 | Yeahbox Sonic Boom Ultra | |
|---|---|---|
| Price | $430.00 | $388.00 |
| Ranked | #104 of 112 in Boombox Size Portable Bluetooth Speakers | #11 of 112 in Boombox Size Portable Bluetooth Speakers |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | ~65Hz | - |
| Battery Life | 25 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| IP Rating | IP67 | IPX6 |
| MicroSD Playback | Yes | Yes |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| Weight | 10 lbs (4.54 kg) | 24.3 lbs (11 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| App | No | Yes |
| EQ | No | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) |
| TWS | Yes | Yes |
| Party Mode | Yes (Turtlebox Party Mode) | No (TWS stereo pairing of 2 units only, no Auracast) |
| Power Bank | Yes (USB-C) | - |
| USB Playback | No | Yes |
| Built-in Microphone | No | - |
| Power Input | DC Barrel Connector (15V/3A) | USB-C (60W fast charging) |
| Bluetooth Version | 5.4 | 6.0 |
| Amplifier Power | 50W | 320W RMS / 500W Peak |
| Dimensions | 12” x 7” x 8.7” (305 x 178 x 222 mm) | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) |
| Drivers | 1x 6x9” (152x228mm) woofer + 1x 1” (25mm) tweeter | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way |
| Digital Aux Input | No | No |
| Strap | No | No |
| Microphone Input | Yes (3.5mm) | - |
| Battery Capacity | 85Wh | 45000mAh (Reviewer estimated) |
| Maximum SPL | 102dB (measured by Williston Audio Labs) | - |
| Inputs | - | HDMI ARC (in/out, usable as a TV soundbar), AUX in/out, USB drive, microSD, optional wired mic |
| Lights | - | Yes |
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