Short answer: the Tronsmart Mirtune C3. It ranks #102 of 182 medium speakers by sound quality, rated 3.1/5, at $29.99; the Ultimate Ears Wonderboom 4 ranks #110, rated 2.9/5, and costs $64.99, so there is not much of a tradeoff to weigh.
What the Tronsmart Mirtune C3 does well: A small, light waterproof speaker at a budget price, with Auracast multi speaker sync, stereo pairing, USB-C audio input and app EQ. It links with other speakers (Auracast), which the Ultimate Ears Wonderboom 4 cannot. It has an adjustable EQ, which the Ultimate Ears Wonderboom 4 lacks. The catch: In GiT’s three way blind test it came behind the Creative Muvo Go and Xiaomi Sound Outdoor, sounding good only on sparse tracks, and listeners in AudioPro Reviews’ comparison found the JBL Flip 6 fuller with more bass.
The Ultimate Ears Wonderboom 4 is the lighter option. 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 Tronsmart Mirtune C3 at 1.2 lbs (530 g). Watch for: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Tronsmart Mirtune C3. 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
| Tronsmart Mirtune C3 | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $29.99 | $64.99 |
| Ranked | #102 of 182 in Medium Size Portable Bluetooth Speakers | #110 of 182 in Medium Size Portable Bluetooth Speakers |
| Aux Input | No | No |
| Amplifier Power | 30W | - |
| App | Yes (Tronsmart) | No |
| Battery Capacity | 14.8Wh (7.4V, 2000mAh) | - |
| Battery Life | 12 hours at 50% volume (Manufacturer specified) | 14 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 6.0 | 5.2 |
| Charging Time | 2 hours | - |
| Digital Aux Input | Yes (USB-C) | No |
| Dimensions | 7.1”H x 2.8”W x 2.8”D (180 x 70 x 72 mm) | 4.1” x 3.8” (104 x 95.3 mm) |
| Drivers | 1x racetrack woofer + 1x tweeter | 2x 40mm active drivers + 2x passive radiators (46.1 x 65.2mm) |
| EQ | Yes (app) | No |
| Frequency Response | 55Hz - 20kHz (Manufacturer specified) | - |
| IP Rating | IPX7 | IP67 |
| Omnidirectional | No | Yes |
| Party Mode | Yes (Auracast) | No |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Strap | Yes (lanyard) | Yes (built-in loop) |
| TWS | Yes | Yes |
| Weight | 1.2 lbs (0.53 kg) | 0.9 lbs (420 g) |
| Maximum SPL | - | 87dB (Manufacturer specified) |
| Built-in Microphone | - | No |
| Power Bank | - | No |
Where the Ratings Come From
- Tronsmart Mirtune C3: reviews by THBOX, GiT and AudioPro.
- Ultimate Ears Wonderboom 4: reviews by Smart Home Sounds and YouTube.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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