Short answer: the Yeahbox Sonic Boom Max 3. It ranks #59 of 112 boombox speakers by sound quality, rated 3.2/5, at $228.99. The Zealot S78 ranks #110, rated 2.0/5, at $91.38, $137.61 cheaper, a saving that is not big enough to make up the sound-quality gap.
The Yeahbox Sonic Boom Max 3 is the better-sounding choice. A large party speaker with powerful bass, a big fast charging battery and app EQ for outdoor parties. The tradeoff: There is limited independent testing and the water/dust rating is reported inconsistently across listings.
The Zealot S78 is the lighter pick. A loud, rugged party speaker with full waterproofing, a power bank and wireless pairing for outdoor parties. At 9.7 lbs (4.4 kg) it weighs much less than the Yeahbox Sonic Boom Max 3 at 16.8 lbs (7.64 kg). Watch for: At high volume, reviews report distortion and fluctuating level, so its headline power is more useful below its maximum setting.
Buy the Yeahbox Sonic Boom Max 3. It is rated higher for sound quality, and the $137.61 saving on the Zealot S78 is not enough to make up the difference.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A large party speaker with powerful bass, a big fast charging battery and app EQ for outdoor parties.
A loud, rugged party speaker with full waterproofing, a power bank and wireless pairing for outdoor parties.
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 Max 3 | Zealot S78 | |
|---|---|---|
| Price | $228.99 | $91.38 |
| Ranked | #59 of 112 in Boombox Size Portable Bluetooth Speakers | #110 of 112 in Boombox Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Battery Life | 111Wh (14.8V/7,500mAh) (Manufacturer specified) | 40 hours (Manufacturer specified) |
| EQ | Yes | Yes (multiple modes) |
| IP Rating | IPX6 | IP67 |
| MicroSD Playback | Yes | Yes |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 16.8 lbs (7.64 kg) | 9.7 lbs (4.4 kg) |
| USB Playback | Yes | Yes |
| Amplifier Power | 200W RMS / 300W Peak | 120W RMS / 150W peak |
| Dimensions | 20.7” x 8.3” x 10.6” (525 x 210 x 268 mm) | 16.1” x 6.6” x 7.3” (410 x 167 x 185 mm) |
| Drivers | 189x114mm woofer, 2x 89mm midrange, 2x 38mm tweeters | 2x ~120mm (4.72”) woofers + 2x ~42mm tweeters + 2x passive radiators |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC |
| Lights | Yes | - |
| Strap | No | Yes (detachable shoulder strap) |
| Party Mode | - | No |
| Power Bank | - | Yes (USB-A) |
| Built-in Microphone | - | No |
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