Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Zealot S97 ranks #49 of 82 large speakers by sound quality at $65.86; the Ultimate Ears Wonderboom 4 ranks #89 of 144 medium speakers by sound quality at $59.99.
What the Zealot S97 does well: For a compact 3.3kg boombox, the S97 delivers unusually deep, clean-enough bass with a more sensible default balance than many inexpensive Zealot models. The catch: It is not especially loud for its size, battery life is only a claimed 12 hours, and the bass preset can swamp the rest of the music.
Why pick the Ultimate Ears Wonderboom 4: Small size. Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Zealot S97 at $65.86 for a large speaker, or the Ultimate Ears Wonderboom 4 at $59.99 for a medium speaker instead.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Zealot S97 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $65.86 with coupon YZZL10 | $59.99 |
| Ranked | #49 of 82 in Large Size Portable Bluetooth Speakers | #89 of 144 in Medium Size Portable Bluetooth Speakers |
| App | No | No |
| Aux Input | Yes | No |
| Battery Life | 12 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| EQ | 3 EQ presets | No |
| IP Rating | IPX6 | IP67 |
| MicroSD Playback | Yes | - |
| Party Mode | Yes (PartyAdd up to 100 speakers) | No |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | No | Yes |
| Weight | 7.3 lbs (3.3 kg) | 0.9 lbs (420 g) |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | No |
| Power Bank | Yes (USB-A + USB-C) | No |
| Bluetooth Version | 5.2 | 5.2 |
| Dimensions | 12.6” x 7.3” x 5.9” (321 x 185 x 151 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Amplifier Power | 80W | - |
| Drivers | 2x 76mm (3”) woofers + 2x 38mm tweeters + 2x passive radiators | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| Digital Aux Input | No | No |
| Maximum SPL | - | 87dB (Manufacturer specified) |
| Strap | - | Yes (built-in loop) |
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Prices on this page were last checked September 26, 2026 at 11:14 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 S97: $65.86 with coupon YZZL10 AliExpress eBay
Pros: For a compact 3.3kg boombox, the S97 delivers unusually deep, clean-enough bass with a more sensible default balance than many inexpensive Zealot models. It also brings IPX6 protection, aux and microSD playback, power-bank outputs, three EQ presets and PartyAdd linking.
Cons: It is not especially loud for its size, battery life is only a claimed 12 hours, and the bass preset can swamp the rest of the music. There is no app or fine-grained EQ, so the Vocal preset is the only practical way to improve the balance. It is still heavy for a speaker with this output ceiling.
Full Zealot S97 review and specifications →
| Amplifier Power | 80W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 12.6” x 7.3” x 5.9” (321 x 185 x 151 mm) |
| Drivers | 2x 76mm (3”) woofers + 2x 38mm tweeters + 2x passive radiators |
| EQ | 3 EQ presets |
| 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 | No |
| Weight | 7.3 lbs (3.3 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Ultimate Ears Wonderboom 4: $59.99 Amazon eBay
Older models: the Ultimate Ears Wonderboom 3 (rated 2.9/5), the Ultimate Ears Wonderboom 2 (rated 2.9/5) and the Ultimate Ears Wonderboom (rated 2.9/5).
Pros: Small size.
Cons: Bass isn’t as deep as the top-ranked speakers and is a little thuddy. Not much improvement over the previous Ultimate Ears Wonderboom 3 besides the USB-C charging port.
Full Ultimate Ears Wonderboom 4 review and specifications →
| App | No |
|---|---|
| Aux Input | No |
| Battery Life | 14 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.2 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| EQ | No |
| IP Rating | IP67 |
| Maximum SPL | 87dB (Manufacturer specified) |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 0.9 lbs (420 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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