Short answer: the TOZO PA1. It ranks #60 of 179 medium speakers by sound quality, rated 3.5/5, at $39.99; the Ultimate Ears Wonderboom 4 ranks #109, rated 2.9/5, and costs $64.99, so there is not much of a tradeoff to weigh.
The TOZO PA1 is the better-sounding, longer-running option. A budget water resistant speaker with very long battery life, app EQ and pairing with a second unit. It is rated for 25 hours of battery against 14 for the Ultimate Ears Wonderboom 4. It supports AAC Bluetooth, which the Ultimate Ears Wonderboom 4 lacks. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks. Watch for: Bass is limited, fading by about 52Hz.
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 noticeably less than the TOZO PA1 at 1.3 lbs (581 g). Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the TOZO PA1. It is rated higher for sound quality than the Ultimate Ears Wonderboom 4 and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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Specifications Side By Side
| TOZO PA1 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $39.99 | $64.99 |
| Ranked | #60 of 179 in Medium Size Portable Bluetooth Speakers | #109 of 179 in Medium Size Portable Bluetooth Speakers |
| Bass Extension (-10dB) | 52Hz | - |
| Battery Life | 25 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Bluetooth Latency | 220ms | - |
| Maximum SPL | 98dB (measured by Alan Ross Reviews) | 87dB (Manufacturer specified) |
| Stereo | No | No |
| Omnidirectional | No | Yes |
| Weight | 1.3 lbs (581 g) | 0.9 lbs (420 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.0 | 5.2 |
| Drivers | 67mm fullrange | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| Dimensions | 8.3” x 3.6” x 2.4” (210 x 91 x 61 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Frequency Response | 55Hz - 18kHz (Manufacturer specified) | - |
| Amplifier Power | 20W | - |
| IP Rating | IPX6 | IP67 |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC, AAC | SBC |
| App | Yes | No |
| Aux Input | No | No |
| EQ | Yes | No |
| TWS | Yes | Yes |
| Power Input | USB-C | USB-C |
| Strap | Yes (lanyard) | Yes (built-in loop) |
| Party Mode | - | No |
| Built-in Microphone | - | No |
| Power Bank | - | No |
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