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 Grande ranks #80, rated 2.6/5, and costs $730, so there is not much of a tradeoff to weigh.
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 Grande 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.
The Turtlebox Grande is the lighter option. A rugged, submersible, crush-proof speaker with a 10 inch woofer and a battery that lasts for days. At 18.8 lbs (8.53 kg) it weighs noticeably 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: In YouTube sound samples it sounds only okay, and bass is shallow for a 10 inch woofer, only down 10dB at about 55Hz.
Buy the Yeahbox Sonic Boom Ultra. It is rated higher for sound quality than the Turtlebox Grande and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Portable Bluetooth rankings.
A massively loud boombox with deep bass, long battery life, and HDMI ARC so it can double as a TV soundbar.
A rugged, submersible, crush-proof speaker with a 10 inch woofer and a battery that lasts for days.
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Specifications Side By Side
| Yeahbox Sonic Boom Ultra | Turtlebox Grande | |
|---|---|---|
| Price | $388.00 | $730.00 |
| Ranked | #11 of 112 in Boombox Size Portable Bluetooth Speakers | #80 of 112 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Capacity | 45000mAh (Reviewer estimated) | - |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 6.0 | 5.4 |
| Dimensions | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) | 14” x 8.4” x 11.5” (355.6 x 213.4 x 292.1 mm) |
| Drivers | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way | 1x 10” (254mm) woofer + 1x 1.25” (32mm) titanium tweeter |
| EQ | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) | No |
| Inputs | HDMI ARC (in/out, usable as a TV soundbar), AUX in/out, USB drive, microSD, optional wired mic | - |
| IP Rating | IPX6 | IP67 |
| MicroSD Playback | Yes | Yes |
| Amplifier Power | 320W RMS / 500W Peak | 86W |
| Party Mode | No (TWS stereo pairing of 2 units only, no Auracast) | Yes (Turtlebox Party Mode) |
| Power Input | USB-C (60W fast charging) | DC Barrel Connector (20V/3A) |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | No |
| Weight | 24.3 lbs (11 kg) | 18.8 lbs (8.53 kg) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC |
| Lights | Yes | - |
| Battery Life | 24 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Strap | No | No |
| Bass Extension (-10dB) | - | ~55Hz |
| Built-in Microphone | - | Yes |
| Power Bank | - | Yes (USB-C) |
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