Different classes, so treat this as a step-up-or-not question rather than a head-to-head. The Zealot S97 ranks #66 of 120 large speakers by sound quality at $79.98; the Ultimate Ears Wonderboom 4 ranks #109 of 179 medium speakers by sound quality at $64.99.
What the Zealot S97 does well: A budget boombox with surprisingly deep bass for its size, waterproofing, power bank outputs, and microSD and aux playback. It keeps a wired aux input, which the Ultimate Ears Wonderboom 4 lacks. It links with other speakers (PartyAdd up to 100 speakers), which the Ultimate Ears Wonderboom 4 cannot. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks. The tradeoff: 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.
The Ultimate Ears Wonderboom 4 is the lighter pick. A small, tough waterproof speaker with a strap loop and USB-C charging, easy to clip on a bag for outdoor trips. At 0.9 lbs (420 g) it weighs much less than the Zealot S97 at 7.3 lbs (3.3 kg). Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Zealot S97 at $79.98 for a large speaker, or the Ultimate Ears Wonderboom 4 at $64.99 for a medium speaker instead.
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.
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Specifications Side By Side
| Zealot S97 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $79.98 | $64.99 |
| Ranked | #66 of 120 in Large Size Portable Bluetooth Speakers | #109 of 179 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 | Yes | Yes |
| 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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