Short answer: the Ultimate Ears Wonderboom 4, though neither ranks well in its class. It ranks #109 of 175 medium speakers by sound quality (rated 2.9/5) at $74.50 and is still sold new; the Zealot S61 ranks #172 (rated 2.0/5) and is discontinued, so it is only an option used. Both are rated below 3.0/5 among the 175 medium speakers, and the EarFun Uboom L, ranked #2 at $49.79, is a better place to start if sound quality matters.
The Ultimate Ears Wonderboom 4 is the better-sounding, lighter choice. At 0.9 lbs (420 g) it weighs noticeably less than the Zealot S61 at 1.5 lbs (665 g). The tradeoff: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
The Zealot S61 is the longer-running pick. 20W output, IPX7 waterproof, exceptional 40-hour battery life, Bluetooth 5.2, TWS stereo pairing, compact 1.5 lbs (665 g) design, single full-range driver, built-in microphone, AUX input, USB-C charging. It is rated for 40 hours of battery against 14 for the Ultimate Ears Wonderboom 4. It keeps a wired aux input, which the Ultimate Ears Wonderboom 4 lacks. Watch for: Sounds like a soup can, no bass at all.
Buy the Ultimate Ears Wonderboom 4. It is rated higher for sound quality and still sold new, while the Zealot S61 is discontinued.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Ultimate Ears Wonderboom 4 | Zealot S61 | |
|---|---|---|
| Price | $74.50 | $20 Discontinued |
| Ranked | #109 of 175 in Medium Size Portable Bluetooth Speakers | #172 of 175 in Medium Size Portable Bluetooth Speakers |
| Battery Life | 14 hours (Manufacturer specified) | 40 hours (Manufacturer specified) |
| Maximum SPL | 87dB (Manufacturer specified) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No (single full-range driver) |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs (420 g) | 1.5 lbs (665 g) |
| IP Rating | IP67 | IPX7 |
| Bluetooth | Yes | Yes |
| 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 | No |
| EQ | No | No |
| Built-in Microphone | No | Yes |
| Power Bank | No | No |
| Aux Input | No | Yes |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Strap | Yes (built-in loop) | - |
| Amplifier Power | - | 20W |
Related Speaker Comparisons
How Ultimate Ears Wonderboom 4 compares with other leading options:
- Ultimate Ears Wonderboom 4 vs EarFun Uboom L
- Ultimate Ears Wonderboom 4 vs Soundcore Motion 300
- Ultimate Ears Wonderboom 4 vs Soundcore Motion+
- Soundcore Boost “upgraded” 2021 vs Ultimate Ears Wonderboom 4
- Ultimate Ears Wonderboom 4 vs Minirig 4
Prices on this page were last checked October 12, 2026 at 4:13 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: $74.50 Amazon $74.50 eBay
Older models: the Ultimate Ears Wonderboom 3 (ranked lower, rated 2.9/5), the Ultimate Ears Wonderboom 2 (ranked lower, rated 2.9/5) and the Ultimate Ears Wonderboom (ranked lower, rated 2.9/5). See every Ultimate Ears Wonderboom, Boom and Megaboom generation.
Same family: the Ultimate Ears Boom 4 (larger model, ranked lower, rated 2.9/5) and the Ultimate Ears Megaboom 4 (larger model, ranked lower, rated 2.1/5).
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 →
| Released | Jun 2024 (2 years ago) |
|---|---|
| App | No |
| Aux Input | No |
| Battery Life | 14 hours (Manufacturer specified) |
| Bluetooth | Yes |
| 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
- 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 138 comparisons
Zealot S61: $20 Discontinued 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. Discontinued and no longer sold new.
Full Zealot S61 review and specifications →
| Released | Feb 2022 (4 years ago) |
|---|---|
| Amplifier Power | 20W |
| App | No |
| Aux Input | Yes |
| Battery Life | 40 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| 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 |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No (single full-range driver) |
| TWS | Yes |
| Weight | 1.5 lbs (665 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons