Short answer: the Bose Soundlink Flex 2nd gen. It ranks #37 of 179 medium speakers by sound quality, rated 3.8/5, at $159. The Tronsmart Mirtune S100 ranks #97, rated 3.1/5, at $79.99, $79.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
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 much less than the Tronsmart Mirtune S100 at 3 lbs (1.36 kg). It supports aptX Adaptive Bluetooth, which the Tronsmart Mirtune S100 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.
The Tronsmart Mirtune S100 is the longer-running choice. A waterproof speaker with long battery life for outdoor and casual listening. It is rated for 20 hours of battery against 12 for the Bose Soundlink Flex 2nd gen. It keeps a wired aux input, which the Bose Soundlink Flex 2nd gen lacks.
Buy the Bose Soundlink Flex 2nd gen. It is rated higher for sound quality, and the $79.01 saving on the Tronsmart Mirtune S100 is not enough to make up the difference.
Want more options? Browse the full Portable Bluetooth rankings.
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Specifications Side By Side
| Bose Soundlink Flex 2nd gen | Tronsmart Mirtune S100 | |
|---|---|---|
| Price | $159.00 | $79.99 |
| Ranked | #37 of 179 in Medium Size Portable Bluetooth Speakers | #97 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (3 band) | Yes |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Bose Party mode) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Partially |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (586 g) | 3 lbs (1.36 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.3 | 5.3 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 9.1” x 3.5” x 3.9” (231 x 88 x 100 mm) |
| Aux Input | No | Yes |
| Drivers | 60mm full-range driver with passive radiators | 20W drivers |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | - |
| Bass Extension (-10dB) | - | ~64Hz |
| Wi-Fi | - | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 50W |
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