Short answer: the Bose Soundlink Flex. It ranks #38 of 182 medium speakers by sound quality, rated 3.8/5, at $79.99. The Tronsmart Mirtune C3 Plus ranks #84, rated 3.3/5, at $49.99, $30 cheaper, which does not close the gap in sound quality.
The Bose Soundlink Flex is the better-sounding, lighter pick. A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use. At 1.3 lbs (589 g) it weighs noticeably less than the Tronsmart Mirtune C3 Plus at 1.8 lbs (810 g). The catch: Warm sounding with overly boosted bass which drowns out midrange detail.
The case for the Tronsmart Mirtune C3 Plus: An affordable waterproof speaker with a separate tweeter, app EQ, Auracast linking, stereo pairing and USB-C audio input. It has an adjustable EQ, which the Bose Soundlink Flex lacks. Watch for: 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.
Buy the Bose Soundlink Flex. It is rated higher for sound quality, and the $30 you would save on the Tronsmart Mirtune C3 Plus does not close the gap.
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.
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Specifications Side By Side
| Bose Soundlink Flex | Tronsmart Mirtune C3 Plus | |
|---|---|---|
| Price | $79.99 | $49.99 |
| Ranked | #38 of 182 in Medium Size Portable Bluetooth Speakers | #84 of 182 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (Tronsmart) |
| Bass Extension (-10dB) | 56Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 12 hours at 50% volume (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | No | Yes (app) |
| IP Rating | IP67 | IPX7 |
| Bluetooth Latency | 33ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Bose Party mode) | Yes (Auracast) |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (589 g) | 1.8 lbs (0.81 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 6.0 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 8.3”H x 3.1”W x 3.3”D (210 x 80 x 85 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | 1x racetrack woofer + 1x tweeter |
| Digital Aux Input | No | Yes (USB-C) |
| Bluetooth Codecs | SBC | SBC |
| Aux Input | No | No |
| Strap | Yes (built-in loop) | Yes (lanyard) |
| Amplifier Power | - | 50W |
| Charging Time | - | 4 hours |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
Where the Ratings Come From
- Bose Soundlink Flex: reviews by Joy & Oluv’Sone, Oluv and Alan Ross.
- Tronsmart Mirtune C3 Plus: reviews by Oluv, Mateusz Cholewa and Techder Audios.
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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