Short answer: the Zealot S89, and the ranking gap is the story. It ranks #18 of 75 boombox speakers at $259.99; the Yeahbox ranks #40 at $228.99, only $31 less.
The Yeahbox’s spec sheet is harder to trust. It’s a budget import brand with limited independent testing, so figures like the claimed 200W RMS are manufacturer-reported rather than measured, and even its own water rating is inconsistent: IPX6 on Yeahbox’s site, IP66 or IP67 on various marketplace listings. That uncertainty is baked into its lower ranking.
The Zealot is the more known quantity. Our notes flag it as likely sharing internals with the [Zealot ZE21](/portable/speakers/Zealot-ZE21/), a speaker already measured and ranked here, which gives its listed performance more credibility even with real flaws of its own: a rolled off top end and a bloated, muddy bass EQ.
Neither is a refined-sounding speaker. Both trade clarity for raw bass and volume, which is the whole appeal of this end of the boombox class. The Zealot simply does it with numbers we trust more.
Buy the Zealot S89 for the more credible spec sheet and higher ranking. Buy the Yeahbox only if the extra driver count and features on paper are worth the uncertainty to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Yeahbox Sonic Boom Max 3 | Zealot S89 | |
|---|---|---|
| Price | $228.99 | $259.99 |
| Ranked | #40 of 75 in Boombox Size Portable Bluetooth Speakers | #18 of 75 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 | IPX6 |
| 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) | 16.1 lbs (7.3 kg) |
| USB Playback | Yes | Yes |
| Amplifier Power | 200W RMS / 300W Peak | 250W |
| Dimensions | 20.7" x 8.3" x 10.6" (525 x 210 x 268 mm) | 21.2" x 10.4" x 9.4" (538 x 265 x 240 mm) |
| Drivers | 189x114mm woofer, 2x 89mm midrange, 2x 38mm tweeters | 130W subwoofer + 2x 40mm drivers + 2x tweeters |
| Bluetooth Version | 5.3 | 5.3 |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC |
| Lights | Yes | - |
| Bass Extension (-10dB) | - | 36Hz |
| Party Mode | - | Yes (PartyAdd up to 100 speakers) |
| Power Bank | - | Yes (USB-A + USB-C) |
| Built-in Microphone | - | No |
Related Speaker Comparisons
More top alternatives to Zealot S89:
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- JBL Partybox Encore 2 vs Zealot S89
- JBL Partybox Encore Essential 2 vs Zealot S89
- JBL Partybox Encore vs Zealot S89
Prices on this page were last checked September 22, 2026 at 5:11 AM 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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The Two Speakers In Full
Yeahbox Sonic Boom Max 3: $228.99 Amazon eBay
Pros: A large 3-way, 5-driver party speaker with claimed 200W RMS output, a 111Wh battery, USB-C fast charging, app EQ, TWS pairing, and aux, USB and microSD playback. Listener comparisons describe powerful bass, strong output and decent mids and highs for outdoor party use.
Cons: There is limited independent testing and the water/dust rating is reported inconsistently across listings. Listener comparisons find it less clear and refined than stronger boombox rivals, so its big bass and output are a better fit for parties than critical listening.
Full Yeahbox Sonic Boom Max 3 review and specifications →
| Amplifier Power | 200W RMS / 300W Peak |
|---|---|
| App | Yes |
| Aux Input | Yes |
| Battery Life | 111Wh (14.8V/7,500mAh) (Manufacturer specified) |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.3 |
| Digital Aux Input | No |
| Dimensions | 20.7" x 8.3" x 10.6" (525 x 210 x 268 mm) |
| Drivers | 189x114mm woofer, 2x 89mm midrange, 2x 38mm tweeters |
| EQ | Yes |
| IP Rating | IPX6 |
| Lights | Yes |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 16.8 lbs (7.64 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Yeahbox Sonic Boom Max 3 vs Skullcandy Barrel
- Yeahbox Sonic Boom Max 3 vs Sony ULT Field 7
- Yeahbox Sonic Boom Max 3 vs Bugani Boost Max
- Yeahbox Sonic Boom Max 3 vs Soundcore Rave Party 2
- Yeahbox Sonic Boom Max 3 vs Tronsmart Bang Max
- Yeahbox Sonic Boom Max 3 vs Onn Medium Party Speaker Gen 2
- Yeahbox Sonic Boom Max 3 vs JBL Partybox On the Go
- Yeahbox Sonic Boom Max 3 vs B&O Beolit 20
- See all 52 comparisons
Zealot S89: $259.99 Amazon Aliexpress eBay
Pros: A 7.3kg boombox with a claimed 36Hz bass extension, 40-hour battery life, IPX6 protection, USB-C charging, aux, USB and microSD playback, TWS and multi-speaker PartyAdd. Listener comparisons find it capable of very high output and substantial bass for outdoor use. Measured bass extension of 36Hz (-10dB).
Cons: At high volume, listener reports describe the bass as loose or muddy and the overall balance as less clear than better boombox speakers. The heavy cabinet and basic finish also make it less polished for daily portability, while its multiple EQ modes cannot substitute for a genuinely neutral tuning.
Full Zealot S89 review and specifications →
| Amplifier Power | 250W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 36Hz |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 21.2" x 10.4" x 9.4" (538 x 265 x 240 mm) |
| Drivers | 130W subwoofer + 2x 40mm drivers + 2x tweeters |
| EQ | Yes (multiple modes) |
| IP Rating | IPX6 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Party Mode | Yes (PartyAdd up to 100 speakers) |
| Power Bank | Yes (USB-A + USB-C) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| USB Playback | Yes |
| Weight | 16.1 lbs (7.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Oluv Patreon: Zealot S89 vs Yeahbox Boom Max3 - indoor listening test More from Oluv’Sone →
- Oluv Patreon: Zealot S89 vs Yeahbox Sonic Boom Max3 - outdoor test
- Dominik Reviews: Zealot S89 vs JBL Boombox 4 - JBL Alternative? Sound Test More from Dominik Reviews →
- Jagist reviews: Jbl Boombox 4 Vs Zealot S89!!! More from Jagistreviews →
- Techder Audios: ZEALOT S89 VS ZEALOT ZE01 EXTREME POWERFULL VS COMPACTER BASS PERFORMANCE! More from techderaudios →
- Head-to-Head Comparisons