Short answer: the Bose Soundlink Flex 2nd gen for better sound quality, the Tronsmart Mirtune C3 Plus for the lower price. The Bose Soundlink Flex 2nd gen ranks #37 of 182 medium speakers, rated 3.8/5, at $159. The Tronsmart Mirtune C3 Plus ranks #84, rated 3.3/5, at $49.99, $109.01 cheaper.
The Bose Soundlink Flex 2nd gen is the better-sounding, lighter pick. A small, rugged waterproof speaker with clear, well balanced mids, app EQ, aptX Adaptive and stereo pairing with a second unit. At 1.3 lbs (586 g) it weighs noticeably less than the Tronsmart Mirtune C3 Plus at 1.8 lbs (810 g). It supports aptX Adaptive Bluetooth, which the Tronsmart Mirtune C3 Plus lacks. The tradeoff: One Flex remains mono and cannot deliver genuine low-bass rumble; RTINGS also found the elevated treble can turn hi-hats and other high-frequency detail piercing.
Why pick the Tronsmart Mirtune C3 Plus: An affordable waterproof speaker with a separate tweeter, app EQ, Auracast linking, stereo pairing and USB-C audio input. The tradeoff: 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 2nd gen if sound quality matters more than the price. Buy the Tronsmart Mirtune C3 Plus if the price matters more than sound quality.
Want more options? Browse the full Portable Bluetooth rankings.
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 2nd gen | Tronsmart Mirtune C3 Plus | |
|---|---|---|
| Price | $159.00 | $49.99 |
| Ranked | #37 of 182 in Medium Size Portable Bluetooth Speakers | #84 of 182 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (Tronsmart) |
| Battery Life | 12 hours (Manufacturer specified) | 12 hours at 50% volume (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | Yes (3 band) | Yes (app) |
| IP Rating | IP67 | IPX7 |
| 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 (586 g) | 1.8 lbs (0.81 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 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) |
| Aux Input | No | No |
| Drivers | 60mm full-range driver with passive radiators | 1x racetrack woofer + 1x tweeter |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC |
| Digital Aux Input | No | Yes (USB-C) |
| 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 2nd gen: 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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