These sit in different size classes, so this is not a straight ranking comparison. The Marshall Willen II ranks #11 of 62 small speakers by sound quality at $129.99; the Bose Soundlink Flex 2nd gen ranks #37 of 179 medium speakers by sound quality at $159.
The Marshall Willen II is the longer-running, lighter choice. A tiny waterproof strap on speaker with balanced sound, a long battery, and app EQ that clips easily onto a bag. It is rated for 17 hours of battery against 12 for the Bose Soundlink Flex 2nd gen. At 0.8 lbs (360 g) it weighs much less than the Bose Soundlink Flex 2nd gen at 1.3 lbs (586 g). The catch: Not that deep of bass.
Why pick the Bose Soundlink Flex 2nd gen: A small, rugged waterproof speaker with clear, well balanced mids, app EQ, aptX Adaptive and stereo pairing with a second unit. It supports aptX Adaptive Bluetooth, which the Marshall Willen II lacks. It links with other speakers (Bose Party mode), which the Marshall Willen II cannot. The catch: 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.
Buy the Marshall Willen II at $129.99 for a small speaker, or the Bose Soundlink Flex 2nd gen at $159 for a medium speaker instead.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
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
| Marshall Willen II | Bose Soundlink Flex 2nd gen | |
|---|---|---|
| Price | $129.99 | $159.00 |
| Ranked | #11 of 62 in Small Size Portable Bluetooth Speakers | #37 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | 70Hz | - |
| Battery Life | 17 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes | Yes (3 band) |
| IP Rating | IP67 | IP67 |
| Party Mode | No | Yes (Bose Party mode) |
| Power Bank | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | No |
| TWS | No | Yes |
| Weight | 0.8 lbs (360 g) | 1.3 lbs (586 g) |
| Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, aptX Adaptive |
| Bluetooth Version | 5.3 | 5.3 |
| Frequency Response | 75Hz - 20kHz (Manufacturer specified) | - |
| Charging Time | 2.5 hours | - |
| Drivers | 2” (51mm) full-range with dual passive radiators | 60mm full-range driver with passive radiators |
| Dimensions | 3.9” x 1.7” x 3.9” (99 x 43 x 99 mm) | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) |
| Amplifier Power | 10W | - |
| Digital Aux Input | No | No |
| Strap | Yes (built-in strap) | Yes (built-in loop) |
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