Short answer: the Zealot S89. It ranks #19 of 113 boombox speakers by sound quality, rated 4.0/5, at $193.58; the Onn Pro X Large Boom Boombox ranks #49, rated 3.4/5, and costs $199, which makes this an easy call rather than a real tradeoff.
The Zealot S89 is the better-sounding, longer-running choice. A great value boombox with deep bass, very high volume, a 40 hour battery and water resistance for outdoor parties. It is rated for 40 hours of battery against 20 for the Onn Pro X Large Boom Boombox. The catch: At high volume, listener reports describe the bass as loose or muddy and the overall balance as less clear than better boombox speakers.
What the Onn Pro X Large Boom Boombox does well: A powerful, waterproof party boombox with a 20 hour battery and light modes at a low price. The tradeoff: Bass not as deep as higher ranked speakers like the JBL Boombox 3, JBL Boombox 4, or Tribit Stormbox Blast.
Buy the Zealot S89. It is rated higher for sound quality than the Onn Pro X Large Boom Boombox and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Zealot S89 | Onn Pro X Large Boom Boombox | |
|---|---|---|
| Price | $193.58 | $199.00 |
| Ranked | #19 of 113 in Boombox Size Portable Bluetooth Speakers | #49 of 113 in Boombox Size Portable Bluetooth Speakers |
| App | No | - |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 36Hz | - |
| Battery Life | 40 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| EQ | Yes (multiple modes) | Yes (Bass Boost) |
| IP Rating | IPX6 | IP67 |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| MicroSD Playback | Yes | - |
| Party Mode | Yes (PartyAdd up to 100 speakers) | Yes (Auracast) |
| Power Input | USB-C | AC Power cord |
| Stereo | Yes | - |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 16.1 lbs (7.3 kg) | 17.2 lbs (7.8 kg) |
| Power Bank | Yes (USB-A + USB-C) | Yes (USB-A, 5V/2A) |
| USB Playback | Yes | - |
| Built-in Microphone | No | - |
| Amplifier Power | 250W | 180W RMS (540W peak) |
| Dimensions | 21.2” x 10.4” x 9.4” (538 x 265 x 240 mm) | 20.1” x 10.3” x 9” (510 x 261 x 228 mm) |
| Drivers | 130W subwoofer + 2x 40mm drivers + 2x tweeters | 5 speakers |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.4 (Manufacturer specified) |
| Strap | No | - |
| Removable Battery | - | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Lights | - | Yes |
Related Speaker Comparisons
More top alternatives to Zealot S89: