Short answer: the Tronsmart Mirtune C3 Plus. It ranks #84 of 182 medium speakers by sound quality, rated 3.3/5, at $49.99; the Ultimate Ears Wonderboom 4 ranks #110, rated 2.9/5, and costs $64.99, which makes this an easy call rather than a real tradeoff.
The Tronsmart Mirtune C3 Plus is the better-sounding option. An affordable waterproof speaker with a separate tweeter, app EQ, Auracast linking, stereo pairing and USB-C audio input. 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 side by side tests by Clinch Audio Bass and Mateusz Cholewa, the Xiaomi Sound Party and Soundcore Boom 3i sounded more refined and fuller, and listeners described the C3 Plus’s treble as dull.
The Ultimate Ears Wonderboom 4 is the lighter choice. 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 much less than the Tronsmart Mirtune C3 Plus at 1.8 lbs (810 g). The catch: Bass isn’t as deep as the top-ranked speakers and is a little thuddy.
Buy the Tronsmart Mirtune C3 Plus. 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.
Prices on this page were last checked November 14, 2026 at 6:17 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.
Specifications Side By Side
| Tronsmart Mirtune C3 Plus | Ultimate Ears Wonderboom 4 | |
|---|---|---|
| Price | $49.99 | $64.99 |
| Ranked | #84 of 182 in Medium Size Portable Bluetooth Speakers | #110 of 182 in Medium Size Portable Bluetooth Speakers |
| Aux Input | No | No |
| Amplifier Power | 50W | - |
| App | Yes (Tronsmart) | No |
| 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 | 4 hours | - |
| Digital Aux Input | Yes (USB-C) | No |
| Dimensions | 8.3”H x 3.1”W x 3.3”D (210 x 80 x 85 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 | 50Hz - 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 | 1.8 lbs (0.81 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 Plus: reviews by Oluv, Mateusz Cholewa and Techder Audios.
- 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.
Related Speaker Comparisons
More worthwhile head-to-heads for Tronsmart Mirtune C3 Plus: