Short answer: the Ultimate Ears Wonderboom 4 if sound quality matters most, the Zealot S61 if price matters most. The Ultimate Ears Wonderboom 4 ranks #84 of 136 medium speakers at $59.99. The Zealot S61 ranks #134 at $20, $39.99 cheaper.
What the Ultimate Ears Wonderboom 4 offers: Small size. Watch for: 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.
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 4 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 14 hours for the Ultimate Ears Wonderboom 4.
Specifications Side By Side
| Ultimate Ears Wonderboom 4 | Zealot S61 | |
|---|---|---|
| Price | $59.99 | $20 |
| Ranked | #84 of 136 in Medium Size Portable Bluetooth Speakers | #134 of 136 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | - | - |
| Battery Life | 14 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Bluetooth Latency | - | - |
| Max Volume | 87dB | - |
| Power Input | USB-C | USB-C |
| Stereo | No | - |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs / 420 g | 1.5 lbs / 665 g |
| IP Rating | IP67 | IPX7 |
| Bluetooth Version | 5.2 | 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 (46.1 x 65.2mm) | 66mm full-range |
| TWS | Yes | Yes |
| Party Mode | No | - |
| App | No | - |
| EQ | No | - |
| Built in Microphone | No | Yes |
| Power Bank | No | No |
| Aux Input | No | Yes |
| Digital Aux Input | No | No |
| Output Power | - | 20W |
Related Speaker Comparisons
A few more comparisons worth a look in the same class:
- W-King D8 Mini vs Altec Lansing Lifejacket 2/ Lifejacket 3
- Ultimate Ears Wonderboom 3 vs Tribit Stormbox Mini
- Tribit Xsound Surf vs Ultimate Ears Wonderboom 3
- Soundcore Boost “upgraded” 2021 vs Zealot S61
- Soundcore Boost “original model” pre-2021 vs Zealot S61
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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Ultimate Ears Wonderboom 4: $59.99 Amazon eBay
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 |
| Bass Extension (-10dB) | |
| Battery Life | 14 hours (Manufacturer specified) |
| Bluetooth Latency | |
| 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 |
| Max Volume | 87dB |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 0.9 lbs / 420 g |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Wonderboom 4 vs Ultimate Ears Wonderboom 3
- Ultimate Ears Wonderboom 4 vs Ultimate Ears Megaboom 3
- Ultimate Ears Wonderboom 4 vs Ultimate Ears Wonderboom 2
- Ultimate Ears Wonderboom 4 vs LG Xboom Grab
- Ultimate Ears Wonderboom 4 vs Ultimate Ears Wonderboom
- Ultimate Ears Wonderboom 4 vs Soundcore 2
- Ultimate Ears Wonderboom 4 vs Ultimate Ears Boom 4
- Ultimate Ears Wonderboom 4 vs Tribit Stormbox 2
- See all 77 comparisons
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