Short answer: these are close enough to be the same speaker in different shells. The S89 ranks #18 of 75 boombox speakers at $246.99; the ZE21 ranks #17 at $247.41, essentially the same price and only 1 spot apart. Our notes on the S89 say it’s likely running the same internals as the ZE21.
The sound complaints are identical on paper. Both are described as a little rolled off up top and not well balanced through the rest of the range, with clarity that falls short of better speakers in the class and a bass EQ mode that runs bloated and muddy. Both share the same 36Hz bass extension, 40-hour battery life, and 250W output rating, so there’s no real sound-quality argument for picking one over the other.
The real difference is the cabinet. The S89 is long and low at 21.2 x 10.4 x 9.4 inches and 16.1 lbs, while the ZE21 is shorter but taller and deeper at 16.7 x 10.3 x 14.3 inches and 20.4 lbs, over 4 lbs heavier. The S89’s own notes flag it as on the heavy side despite actually weighing less than the ZE21, which suggests its shape makes it more awkward to carry. The driver layout differs slightly too: the S89 uses two 40mm drivers with two tweeters around its subwoofer, while the ZE21 uses two 50mm woofers with passive radiators.
Buy the Zealot ZE21 for the slightly higher ranking and its documented 116dB max volume spec, which isn’t listed for the S89.
Buy the Zealot S89 if you prefer its longer, lower-profile shape for carrying or mounting, since the sound quality between the two is effectively a wash.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Zealot S89 | Zealot ZE21 | |
|---|---|---|
| Price | $246.99 | $187.15 |
| Ranked | #18 of 75 in Boombox Size Portable Bluetooth Speakers | #17 of 75 in Boombox Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | Yes |
| Bass Extension (-10dB) | 36Hz | 36Hz |
| Battery Life | 40 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| EQ | Yes (multiple modes) | Yes (multiple modes) |
| IP Rating | IPX6 | IPX6 |
| Bluetooth Codecs | SBC | SBC |
| MicroSD Playback | Yes | Yes |
| Party Mode | Yes (PartyAdd up to 100 speakers) | Yes (PartyAdd up to 100 speakers) |
| Power Input | USB-C | USB-C |
| Stereo | Yes | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 16.1 lbs (7.3 kg) | 20.4 lbs (9.27 kg) |
| Power Bank | Yes (USB-A + USB-C) | Yes (USB-A + USB-C) |
| USB Playback | Yes | Yes |
| Built-in Microphone | No | No |
| Amplifier Power | 250W | 250W |
| Dimensions | 21.2" x 10.4" x 9.4" (538 x 265 x 240 mm) | 16.7" x 10.3" x 14.3" (424 x 262 x 363 mm) |
| Drivers | 130W subwoofer + 2x 40mm drivers + 2x tweeters | 130W subwoofer + 2x 50mm woofers + passive radiators |
| Digital Aux Input | No | No |
| Bluetooth Version | 5.3 | 5.3 |
| Maximum SPL | - | 116dB (Manufacturer specified) |
Related Speaker Comparisons
How Zealot ZE21 compares with other leading options:
- Tribit Stormbox Blast vs Zealot ZE21
- Harman Kardon Go + Play 3 vs Zealot ZE21
- JBL Partybox Encore 2 vs Zealot ZE21
- JBL Partybox Encore Essential 2 vs Zealot ZE21
- JBL Partybox Encore vs Zealot ZE21
Prices on this page were last checked September 23, 2026 at 11:24 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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The Two Speakers In Full
Zealot S89: $246.99 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
- Zealot S89 vs JBL Boombox 4
- Zealot S89 vs Zealot ZE41
- Zealot S89 vs Harman Kardon Go + Play 2
- Zealot S89 vs Harman Kardon Onyx Studio 5
- Zealot S89 vs Zealot ZE51
- Zealot S89 vs Harman Kardon Onyx Studio 9
- Zealot S89 vs JBL Boombox 3 Wifi
- Zealot S89 vs Harman Kardon Onyx Studio 7
- See all 55 comparisons
Zealot ZE21: $187.15 Amazon Aliexpress eBay
Pros: The ZE21’s main attraction is unusually deep bass for a battery boombox: owner testing finds real output in the 40-50Hz region and audibility down toward the low 30s. Its TWS button can form a stereo pair with another compatible Zealot, and its large, rugged chassis gives it credible party-speaker scale. Measured bass extension of 36Hz (-10dB).
Cons: That deep-bass emphasis comes with a pronounced 60-110Hz kick-bass dip and over-loud 250-600Hz lower mids, which can make rock and pop sound hollow or boxy. The supplied sound modes do not fully correct the tuning; the most positive independent report required source-side parametric EQ. Treble is also soft and clarity trails better-tuned rivals.
Full Zealot ZE21 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 | 16.7" x 10.3" x 14.3" (424 x 262 x 363 mm) |
| Drivers | 130W subwoofer + 2x 50mm woofers + passive radiators |
| EQ | Yes (multiple modes) |
| IP Rating | IPX6 |
| Maximum SPL | 116dB (Manufacturer specified) |
| 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 | 20.4 lbs (9.27 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Jagist reviews: Jbl Boombox 4 Vs Zealot Ze21!!! More from Jagistreviews →
- Jagist reviews: Zealot Ze21 Vs Tribit Stormbox Blast 2!!!
- Techder Audios: JBL Boombox 4 VS Zealot ZE21 BATTLE OF THE BOOMBOXES! More from techderaudios →
- Jay’s Straight Up Reviews & More: Zealot ZE21 vs JBL Boombox 3 Tailgater Special @20ft. The Budget Beast Against the OG Boombox More from JaysStraightUpReviews →
- Head-to-Head Comparisons
- Zealot ZE21 vs Zealot ZE41
- Zealot ZE21 vs JBL Boombox 4
- Zealot ZE21 vs Zealot ZE51
- Zealot ZE21 vs Harman Kardon Onyx Studio 9
- Zealot ZE21 vs Harman Kardon Go + Play 2
- Zealot ZE21 vs Harman Kardon Onyx Studio 7
- Zealot ZE21 vs Harman Kardon Onyx Studio 5
- Zealot ZE21 vs Harman Kardon Onyx Studio 6
- See all 56 comparisons