Short answer: the Bose Soundlink Flex. It ranks #38 of 179 medium speakers by sound quality, rated 3.8/5, at $79.99. The Dayton Audio Boost ranks #153, rated 2.4/5, at $29.98, $50.01 cheaper, which does not close the gap in sound quality.
The Bose Soundlink Flex is the better-sounding, deeper-bass option. A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use. Its bass reaches about 56Hz before falling 10dB, against 87Hz for the Dayton Audio Boost. It is rated for 12 hours of battery against 6 for the Dayton Audio Boost. The tradeoff: Warm sounding with overly boosted bass which drowns out midrange detail.
The Dayton Audio Boost is the lighter option. A small, cheap soda can sized waterproof speaker with stereo pairing, microSD playback and an aux input. At 0.9 lbs (426 g) it weighs noticeably less than the Bose Soundlink Flex at 1.3 lbs (589 g). It keeps a wired aux input, which the Bose Soundlink Flex lacks. It plays in stereo from a single unit, unlike the Bose Soundlink Flex. Watch for: Some midrange peaks, treble slightly rolled off.
Buy the Bose Soundlink Flex. It is rated higher for sound quality, and the $50.01 saving on the Dayton Audio Boost is not enough to make up the difference.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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 | Dayton Audio Boost | |
|---|---|---|
| Price | $79.99 | $29.98 |
| Ranked | #38 of 179 in Medium Size Portable Bluetooth Speakers | #153 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 56Hz | 87Hz |
| Battery Life | 12 hours (Manufacturer specified) | 6 hours (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | No | No |
| IP Rating | IP67 | IPX7 |
| Bluetooth Latency | 33ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Bose Party mode) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (589 g) | 0.9 lbs (426 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.0 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 3.5” x 3.5” x 4.3” (88.9 x 88.9 x 109.2 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | 2x 1.5” full-range drivers + 2x passive radiators |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Aux Input | No | Yes |
| Strap | Yes (built-in loop) | - |
| Amplifier Power | - | 70W RMS |
| MicroSD Playback | - | Yes |
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