Short answer: the EcoXGear Defender on measured sound quality, the Zealot S78 on price, though neither ranks well in its class. The EcoXGear Defender ranks #84 of 112 boombox speakers, rated 2.5/5, at $299.99. The Zealot S78 ranks #110, rated 2.0/5, at $91.38, $208.61 cheaper. Both are rated below 3.0/5 among the 112 boombox speakers; for better sound, the Tribit Stormbox Blast ranks #2 at $179.99.
The EcoXGear Defender is the better-sounding pick. A rugged, floating waterproof speaker that gets very loud for its size, with a flashlight, bottle opener and power bank. 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.
The Zealot S78 is the longer-running choice. A loud, rugged party speaker with full waterproofing, a power bank and wireless pairing for outdoor parties. It is rated for 40 hours of battery against 25 for the EcoXGear Defender. It plays in stereo from a single unit, unlike the EcoXGear Defender. Watch for: At high volume, reviews report distortion and fluctuating level, so its headline power is more useful below its maximum setting.
Buy the EcoXGear Defender when sound quality outweighs the price for you, and the Zealot S78 when the price outweighs sound quality instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A rugged, floating waterproof speaker that gets very loud for its size, with a flashlight, bottle opener and power bank.
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
| EcoXGear Defender | Zealot S78 | |
|---|---|---|
| Price | $299.99 | $91.38 |
| Ranked | #84 of 112 in Boombox Size Portable Bluetooth Speakers | #110 of 112 in Boombox Size Portable Bluetooth Speakers |
| Battery Life | 25 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| App | No | No |
| EQ | Yes | Yes (multiple modes) |
| Party Mode | No | No |
| Power Bank | Yes (USB-C, 5V/2.1A) | Yes (USB-A) |
| USB Playback | No | Yes |
| Built-in Microphone | Yes | No |
| Power Input | USB-C | USB-C |
| FM Tuner | No | - |
| IP Rating | IP67 | IP67 |
| Weight | 10 lbs (4.54 kg) | 9.7 lbs (4.4 kg) |
| Bluetooth Version | 5.1 | 5.3 |
| Amplifier Power | 100W | 120W RMS / 150W peak |
| Aux Input | Yes | Yes |
| Dimensions | 6.7” x 15.4” x 9.6” (170.2 x 391.2 x 243.8 mm) | 16.1” x 6.6” x 7.3” (410 x 167 x 185 mm) |
| Drivers | 52mm full-range driver | 2x ~120mm (4.72”) woofers + 2x ~42mm tweeters + 2x passive radiators |
| Digital Aux Input | No | No |
| Strap | No | Yes (detachable shoulder strap) |
| MicroSD Playback | - | Yes |
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