Short answer: the Yeahbox Sonic Boom Ultra. It ranks #11 of 112 boombox speakers by sound quality, rated 4.2/5, at $388. The EcoXGear Defender ranks #84, rated 2.5/5, at $299.99, $88.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
The Yeahbox Sonic Boom Ultra is the better-sounding pick. A massively loud boombox with deep bass, long battery life, and HDMI ARC so it can double as a TV soundbar. It plays in stereo from a single unit, unlike the EcoXGear Defender. 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 EcoXGear Defender is the lighter choice. A rugged, floating waterproof speaker that gets very loud for its size, with a flashlight, bottle opener and power bank. At 10 lbs (4.54 kg) it weighs much less than the Yeahbox Sonic Boom Ultra at 24.3 lbs (11 kg). The catch: Its single front-facing driver layout has narrow dispersion: clarity and detail drop noticeably when you move off-axis, and the soundstage is limited.
Buy the Yeahbox Sonic Boom Ultra. It is rated higher for sound quality, and the $88.01 you would save on the EcoXGear Defender does not close the gap.
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, floating waterproof speaker that gets very loud for its size, with a flashlight, bottle opener and power bank.
Prices on this page were last checked October 31, 2026 at 7:11 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Yeahbox Sonic Boom Ultra | EcoXGear Defender | |
|---|---|---|
| Price | $388.00 | $299.99 |
| Ranked | #11 of 112 in Boombox Size Portable Bluetooth Speakers | #84 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 | 5.1 |
| Dimensions | 23.4” x 9.8” x 12.3” (595 x 248 x 313 mm) | 6.7” x 15.4” x 9.6” (170.2 x 391.2 x 243.8 mm) |
| Drivers | 6x9in racetrack woofer (200W) + 2x 4.5in midrange (40W each) + 2x tweeters (20W each), true 3-way | 52mm full-range driver |
| EQ | Yes (Country, Classic, and custom app EQ; custom settings don’t persist after the app closes) | Yes |
| 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 | - |
| Amplifier Power | 320W RMS / 500W Peak | 100W |
| Party Mode | No (TWS stereo pairing of 2 units only, no Auracast) | No |
| Power Input | USB-C (60W fast charging) | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| USB Playback | Yes | No |
| Weight | 24.3 lbs (11 kg) | 10 lbs (4.54 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 |
| Power Bank | - | Yes (USB-C, 5V/2.1A) |
| Built-in Microphone | - | Yes |
| FM Tuner | - | No |
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