Short answer: these are close enough to be the same speaker in different shells. The S89 ranks #19 of 113 boombox speakers at $193.58; the ZE21 ranks #18 at $187.15, 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 (7.3 kg), while the ZE21 is shorter but taller and deeper at 16.7 x 10.3 x 14.3 inches and 20.4 lbs (9.3 kg), over 4 lbs (1.8 kg) 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.
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 | Zealot ZE21 | |
|---|---|---|
| Price | $193.58 | $187.15 |
| Ranked | #19 of 113 in Boombox Size Portable Bluetooth Speakers | #18 of 113 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 | Yes | Yes |
| 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 |
| Strap | No | - |
| Maximum SPL | - | 116dB (Manufacturer specified) |
Related Speaker Comparisons
How Zealot ZE21 compares with other leading options: