Short answer: the Tronsmart Mirtune C3 Plus. It ranks #75 of 150 medium speakers by sound quality, rated 3.3/5, at $49.99; the Ultimate Ears Boom 4 ranks #99, rated 2.9/5, and costs $109.99, so there is not much of a tradeoff to weigh.
The case for the Tronsmart Mirtune C3 Plus: A racetrack woofer and a tweeter rated for 50W, with IPX7 waterproofing, Bluetooth 6.0, Auracast multi-speaker sync, stereo pairing, USB-C audio input, app EQ and a detachable lanyard, at 0.81 kg. 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.
Why pick the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. Watch for: Not much improvement over the old ones.
Buy the Tronsmart Mirtune C3 Plus. It is rated higher for sound quality than the Ultimate Ears Boom 4 and costs less, so only choose the other one for a particular feature it does better.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Tronsmart Mirtune C3 Plus | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $49.99 | $109.99 |
| Ranked | #75 of 150 in Medium Size Portable Bluetooth Speakers | #99 of 150 in Medium Size Portable Bluetooth Speakers |
| Amplifier Power | 50W | - |
| App | Yes (Tronsmart) | Yes |
| Battery Life | 12 hours at 50% volume (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Bluetooth Version | 6.0 | 5.1 |
| 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) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 1x racetrack woofer + 1x tweeter | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| EQ | Yes (app) | Yes (via app) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) | - |
| IP Rating | IPX7 | IP67 |
| Omnidirectional | No | No |
| Party Mode | Yes (Auracast) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Strap | Yes (lanyard) | Yes (built-in loop) |
| TWS | Yes | Yes |
| Weight | 1.8 lbs (0.81 kg) | 1.4 lbs (620 g) |
| Built-in Microphone | - | No |
| Power Bank | - | No |
| Aux Input | - | No |
| Maximum SPL | - | 85dBC (Manufacturer specified) |
Related Speaker Comparisons
How Tronsmart Mirtune C3 Plus compares with other leading options:
- Soundcore Motion 300 vs Tronsmart Mirtune C3 Plus
- JBL Charge 6 vs Tronsmart Mirtune C3 Plus
- JBL Flip 6 vs Tronsmart Mirtune C3 Plus
- JBL Flip 7 vs Tronsmart Mirtune C3 Plus
- Xiaomi Sound Party vs Tronsmart Mirtune C3 Plus
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
Tronsmart Mirtune C3 Plus: $49.99 Tronsmart Best Buy eBay
Pros: A racetrack woofer and a tweeter rated for 50W, with IPX7 waterproofing, Bluetooth 6.0, Auracast multi-speaker sync, stereo pairing, USB-C audio input, app EQ and a detachable lanyard, at 0.81 kg.
Cons: 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. Tronsmart rates the battery at only 12 hours at half volume. It is a mono unit with no aux input.
Full Tronsmart Mirtune C3 Plus review and specifications →
| Amplifier Power | 50W |
|---|---|
| App | Yes (Tronsmart) |
| Battery Life | 12 hours at 50% volume (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 6.0 |
| Charging Time | 4 hours |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 8.3”H x 3.1”W x 3.3”D (210 x 80 x 85 mm) |
| Drivers | 1x racetrack woofer + 1x tweeter |
| EQ | Yes (app) |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (lanyard) |
| TWS | Yes |
| Weight | 1.8 lbs (0.81 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Clinch Audio Bass: Mirtune C3 Plus 50w VS Xioami Sound Party 50w
- Clinch Audio Bass: Mirtune C3 Plus 50w VS SoundCore Boom 3i 50w
- Techder Audios: Xiaomi Sound Party vs Tronsmart Mirtune C3 Plus - Real Sound & Bass Test! More from techderaudios →
- Mateusz Cholewa: Soundcore Boom 3i vs Tronsmart Mirtune C3 Plus More from Mateusz Cholewa →
- Importados Neto Rocha: Vale a pena pagar o dobro? Tronsmart C3 Plus vs JBL Flip 7
- GiT: Tronsmart Mirtune C3 vs C3+ blind test
- Head-to-Head Comparisons
- Tronsmart Mirtune C3 Plus vs Klipsch Nashville
- Tronsmart Mirtune C3 Plus vs JBL Charge 3
- Tronsmart Mirtune C3 Plus vs JBL Charge Essential
- Tronsmart Mirtune C3 Plus vs JBL Flip Essential 2
- Tronsmart Mirtune C3 Plus vs JBL Flip 5
- Tronsmart Mirtune C3 Plus vs Tronsmart Mirtune S100
- Tronsmart Mirtune C3 Plus vs JBL Grip
- Tronsmart Mirtune C3 Plus vs Sony ULT Field 1
- See all 33 comparisons
Ultimate Ears Boom 4: $109.99 Amazon eBay
Older model: the Ultimate Ears Boom 3 (ranked lower, rated 2.9/5).
Pros: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app.
Cons: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 85dBC (Manufacturer specified) |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.4 lbs (620 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Boom 4 vs Ultimate Ears Boom 3
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom
- Ultimate Ears Boom 4 vs Klipsch Groove/Heritage Groove
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 2
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 3
- Ultimate Ears Boom 4 vs DBSONO X-Blast F37
- Ultimate Ears Boom 4 vs Ultimate Ears Wonderboom 4
- Ultimate Ears Boom 4 vs Sony SRS-XE300
- See all 133 comparisons