These are not really the same size class, and that is the honest framing here. The Soundcore Boom 2 ranks #10 of 120 large speakers by sound quality at $99.99; the Bose Soundlink Flex ranks #38 of 179 medium speakers by sound quality at $79.99.
Different sizes. The Boom 2 is a large speaker at 3.7 lbs (1.68 kg). The Flex is a medium at 1.3 lbs (589 g) that clips to a bag and floats. Each is rated within its own class.
The Boom 2 is far louder and deeper. It reaches about 105dB measured and down to roughly 47Hz. The Flex measures about 96dB and reaches 56Hz. The Boom 2 also has partial stereo from two tweeters, a claimed 24 hours of battery against 12, and a power bank output.
The Flex is warm with heavily boosted bass that can drown out midrange detail, and it has no EQ adjustment. The Boom 2 needs EQ too: turn BassUp off and use one of the community EQs linked on its page for its best sound.
The Flex is the easier one to carry, it is IP67 against the Boom 2’s IPX7, and it has a built-in microphone.
Buy the Soundcore Boom 2 at $99.99 if you want a large speaker. Buy the Bose Soundlink Flex at $79.99 if you want 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
| Soundcore Boom 2 | Bose Soundlink Flex | |
|---|---|---|
| Price | $99.99 | $79.99 |
| Ranked | #10 of 120 in Large Size Portable Bluetooth Speakers | #38 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 47Hz | 56Hz |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | No | Yes |
| EQ | Yes | No |
| IP Rating | IPX7 | IP67 |
| Bluetooth Latency | 125ms | 33ms |
| Maximum SPL | 105dB (measured by Alan Ross Reviews) | 96dB (measured by Alan Ross Reviews) |
| MicroSD Playback | No | - |
| Party Mode | Yes (PartyCast 2.0 up to 100 speakers) | Yes (Bose Party mode) |
| Power Bank | Yes (USB-A) | - |
| Power Input | USB-C | USB-C |
| Stereo | Partially (1 woofer) | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 3.7 lbs (1.68 kg) | 1.3 lbs (589 g) |
| Bluetooth Version | 5.3 | 4.2 |
| Dimensions | 11.7” x 7.3” x 4” (297 x 185 x 102 mm) | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) |
| Drivers | 120mm x 90mm woofer, 2x 20mm tweeters | 1x 60mm full-range driver + 2x passive radiators |
| Frequency Response | 45Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 80W | - |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | No | Yes (built-in loop) |
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