Short answer: the Bogasing G4. It ranks #27 of 177 medium speakers by sound quality, rated 4.0/5, at $42.49; the Bose Soundlink Flex ranks #38, rated 3.8/5, and costs $79.99, so there is little reason to consider the other one.
The Bose Soundlink Flex is the lighter choice. 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 Bogasing G4 at 1.8 lbs (830 g). It links with other speakers (Bose Party mode), which the Bogasing G4 cannot. Watch for: Warm sounding with overly boosted bass which drowns out midrange detail.
The Bogasing G4 is the louder, longer-running pick. A light, affordable waterproof speaker with surprisingly strong bass for its size, solid loudness, long battery life and stereo pairing. Alan Ross Reviews measured it at 100dB at full volume, against 96dB for the Bose Soundlink Flex. It is rated for 24 hours of battery against 12 for the Bose Soundlink Flex. It keeps a wired aux input, which the Bose Soundlink Flex lacks. The catch: The upper treble is boosted and uneven, while the mids sit slightly behind the bass and highs, so it is not a neutral choice for vocal-focused music.
Buy the Bogasing G4. It is rated higher for sound quality than the Bose Soundlink Flex 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.
A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use.
A light, affordable waterproof speaker with surprisingly strong bass for its size, solid loudness, long battery life and stereo pairing.
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Specifications Side By Side
| Bose Soundlink Flex | Bogasing G4 | |
|---|---|---|
| Price | $79.99 | $42.49 |
| Ranked | #38 of 177 in Medium Size Portable Bluetooth Speakers | #27 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 56Hz | 56Hz |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Built-in Microphone | Yes | - |
| EQ | No | No |
| IP Rating | IP67 | IPX7 |
| Bluetooth Latency | 33ms | 90ms |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | 100dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Bose Party mode) | No |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (589 g) | 1.8 lbs (0.83 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.3 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 8.9”H x 2.5”W x 3.4”D (225 x 64 x 86 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | Two drivers and passive radiators |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | LE Audio with LC3 |
| Aux Input | No | Yes |
| Strap | Yes (built-in loop) | - |
| Aux Latency | - | 16ms |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 50W |
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