Short answer: the Minirig 4 if sound quality matters most, the Bose Soundlink Flex if price matters most. The Minirig 4 ranks #7 of 177 medium speakers, rated 4.3/5, at $229.95. The Bose Soundlink Flex ranks #38, rated 3.8/5, at $79.99, $149.96 cheaper.
The Bose Soundlink Flex is the tougher option. A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use. It is rated IP67 against Splash resistant for the Minirig 4. The catch: Warm sounding with overly boosted bass which drowns out midrange detail.
The Minirig 4 is the better-sounding, louder pick. A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery. Alan Ross Reviews measured it at 106dB at full volume, against 96dB for the Bose Soundlink Flex. It is rated for 30 hours of battery against 12 for the Bose Soundlink Flex. It supports AAC Bluetooth, which the Bose Soundlink Flex lacks. Watch for: Calls itself splash resistant and has no official water rating.
Buy the Bose Soundlink Flex if the price matters more than sound quality. Buy the Minirig 4 if sound quality matters more than the price.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use.
A small, long lasting speaker that gets loud and can add a matching subwoofer, with a 30 hour battery.
Prices on this page were last checked October 31, 2026 at 7:11 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 | Minirig 4 | |
|---|---|---|
| Price | $79.99 | $229.95 |
| Ranked | #38 of 177 in Medium Size Portable Bluetooth Speakers | #7 of 177 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | 56Hz | 56Hz |
| Battery Life | 12 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes |
| IP Rating | IP67 | Splash resistant |
| Bluetooth Latency | 33ms | 60ms |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | 106dB (measured by Alan Ross Reviews) |
| Party Mode | Yes (Bose Party mode) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | Pointing up |
| TWS | Yes | Yes (Bluetooth or cable) |
| Weight | 1.3 lbs (589 g) | 1.2 lbs (550 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.0 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 4” x 2.9” (101.6 x 73 mm) (diameter x height) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | 70mm custom driver |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | AAC, SBC |
| Aux Input | No | Yes |
| Strap | Yes (built-in loop) | - |
| Aux Latency | - | 0ms |
| Power Bank | - | Yes (USB-C) |
| Frequency Response | - | 60Hz - 18kHz (Manufacturer specified) |
| Amplifier Power | - | 50W |
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