Short answer: the Ultimate Ears Wonderboom 4, though neither ranks well in its class. It ranks #95 of 150 medium speakers by sound quality, rated 2.9/5, at $59.99. The Tozo PA2 ranks #118, rated 2.5/5, at $39.99, $20 cheaper, not enough of a saving to outweigh the sound-quality gap. Both are rated below 3.0/5 among the 150 medium speakers, and the Earfun Uboom L, ranked #1 at $49.79, is a better place to start if sound quality matters.
The case for the Ultimate Ears Wonderboom 4: Small size. The tradeoff: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
The case for the Tozo PA2: IPX8 rated, rugged fabric-wrapped design. The tradeoff: Quite a bit of bass distortion thudding as you turn the volume up.
Buy the Ultimate Ears Wonderboom 4. It is rated higher for sound quality, and the $20 saving on the Tozo PA2 is not enough to make up the difference.
If battery life is a priority, the Tozo PA2 is rated for 25 hours versus 14 hours for the Ultimate Ears Wonderboom 4.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Ultimate Ears Wonderboom 4 | Tozo PA2 | |
|---|---|---|
| Price | $59.99 | $39.99 |
| Ranked | #95 of 150 in Medium Size Portable Bluetooth Speakers | #118 of 150 in Medium Size Portable Bluetooth Speakers |
| Battery Life | 14 hours (Manufacturer specified) | 25 hours (Manufacturer specified) |
| Maximum SPL | 87dB (Manufacturer specified) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Yes | No |
| Weight | 0.9 lbs (420 g) | 1.2 lbs (540 g) |
| IP Rating | IP67 | IPX8 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.2 | 5.3 |
| Dimensions | 4.1” x 3.8” (104 x 95.3 mm) | 7.1” x 2.8” x 3” (180 x 70 x 76 mm) |
| Drivers | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) | 2x 1.7-inch full-range drivers + 2x passive radiators (44x49mm each) |
| TWS | Yes | Yes |
| Party Mode | No | - |
| App | No | Yes (TOZO App) |
| EQ | No | Yes (16 EQ modes via app) |
| Built-in Microphone | No | Yes |
| Power Bank | No | - |
| Aux Input | No | No |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC, AAC |
| Strap | Yes (built-in loop) | - |
| Amplifier Power | - | 16W |
Related Speaker Comparisons
More worthwhile head-to-heads for Ultimate Ears Wonderboom 4:
- 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 September 30, 2026 at 2:57 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 4: $59.99 Amazon 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).
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 | 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 132 comparisons
Tozo PA2: $39.99 Amazon eBay
Pros: IPX8 rated, rugged fabric-wrapped design. App offers 16 EQ modes and TWS dual-pairing with a second PA2.
Cons: Quite a bit of bass distortion thudding as you turn the volume up. Bass not that deep. The Tozo PA1 totally outclasses it.
Full Tozo PA2 review and specifications →
| Amplifier Power | 16W |
|---|---|
| App | Yes (TOZO App) |
| Aux Input | No |
| Battery Life | 25 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 7.1” x 2.8” x 3” (180 x 70 x 76 mm) |
| Drivers | 2x 1.7-inch full-range drivers + 2x passive radiators (44x49mm each) |
| EQ | Yes (16 EQ modes via app) |
| IP Rating | IPX8 |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.2 lbs (540 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons