Short answer: the Ultimate Ears Wonderboom 2 for better sound quality, the Zealot S61 for the lower price. The Ultimate Ears Wonderboom 2 ranks #86 of 136 medium speakers at $80. The Zealot S61 ranks #134 at $20, $60 cheaper.
What the Ultimate Ears Wonderboom 2 offers: IP67 rated and floats. Compact and light enough to toss in a bag. Watch for: Not stereo, barely any bass, recessed treble. Slightly boosted 93hz upper bass Dip at 9khz. You can tell from the micro USB that they are just feeding you the same crap hardware over and over, this is inexcusable for a product released in 2019. Not technically a 360 speaker, only front and rear.
What the Zealot S61 offers: 20W output, IPX7 waterproof, exceptional 40-hour battery life, Bluetooth 5.2, TWS stereo pairing, compact 665g design, single full-range driver, built-in microphone, AUX input, USB-C charging Watch for: Sounds like a soup can, no bass at all. Weird frequency response all over.
Buy the Ultimate Ears Wonderboom 2 when sound quality outweighs the price for you, and the Zealot S61 when the price outweighs sound quality instead.
The Zealot S61 is not a sound-quality pick. It sits near the bottom of the 136 medium speakers; there are better options higher up.
Battery life favors the Zealot S61: rated for 40 hours against 12 hours for the Ultimate Ears Wonderboom 2.
Specifications Side By Side
| Ultimate Ears Wonderboom 2 | Zealot S61 | |
|---|---|---|
| Price | $80 | $20 |
| Ranked | #86 of 136 in Medium Size Portable Bluetooth Speakers | #134 of 136 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 82Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Max Volume | 88dB | - |
| Power Input | Micro USB | USB-C |
| Stereo | No | - |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs / 420 g | 1.5 lbs / 665 g |
| IP Rating | IP67 | IPX7 |
| Bluetooth Version | 5.1 | 5.2 |
| Dimensions | 4.1" x 3.8" (104 x 95.3 mm) | 4.1" x 4.1" x 6.7" (103 x 103 x 170 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators | 66mm full-range |
| TWS | Yes | Yes |
| Party Mode | No | - |
| App | No | - |
| EQ | No | - |
| Built in Microphone | No | Yes |
| Digital Aux Input | No | No |
| Aux Input | - | Yes |
| Output Power | - | 20W |
| Power Bank | - | No |
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Prices on this page were last checked August 27, 2026 at 10:09 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
Ultimate Ears Wonderboom 2: $80 Amazon eBay
Pros: IP67 rated and floats. Compact and light enough to toss in a bag.
Cons: Not stereo, barely any bass, recessed treble. Slightly boosted 93hz upper bass Dip at 9khz. You can tell from the micro USB that they are just feeding you the same crap hardware over and over, this is inexcusable for a product released in 2019. Not technically a 360 speaker, only front and rear.
Full Ultimate Ears Wonderboom 2 review and specifications →
| App | No |
|---|---|
| Bass Extension (-10dB) | 82Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Version | 5.1 |
| 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 |
| EQ | No |
| IP Rating | IP67 |
| Max Volume | 88dB |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Input | Micro USB |
| Stereo | No |
| TWS | Yes |
| Weight | 0.9 lbs / 420 g |
- Reviews, Comparisons and Sound Samples
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- Ultimate Ears Wonderboom 2 vs Ultimate Ears Megaboom 3
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Zealot S61: $20 Amazon Aliexpress eBay
Pros: 20W output, IPX7 waterproof, exceptional 40-hour battery life, Bluetooth 5.2, TWS stereo pairing, compact 665g design, single full-range driver, built-in microphone, AUX input, USB-C charging
Cons: Sounds like a soup can, no bass at all. Weird frequency response all over.
Full Zealot S61 review and specifications →
| Aux Input | Yes |
|---|---|
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth Version | 5.2 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 4.1" x 4.1" x 6.7" (103 x 103 x 170 mm) |
| Drivers | 66mm full-range |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Output Power | 20W |
| Power Bank | No |
| Power Input | USB-C |
| TWS | Yes |
| Weight | 1.5 lbs / 665 g |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons