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 2nd gen ranks #37 of 179 medium speakers by sound quality at $159.
Different sizes. The Boom 2 is a large 3.7 lbs (1.68 kg) speaker. The Flex 2nd Gen is a medium 1.3 lbs (586 g) speaker that clips to a bag. Each is rated within its own class.
The Boom 2 plays far bigger, at about 105dB measured with bass to about 47Hz, partial stereo from two tweeters, and a claimed 24 hours. Turn BassUp off and use a community EQ from its page for its best sound.
The Flex 2nd Gen has a clear, well balanced midrange, an app EQ, AAC and aptX Adaptive, and a built-in microphone. It is mono, cannot produce low bass rumble, its treble can be piercing, and it claims 12 hours.
Weather: IP67 on the Flex, IPX7 on the Boom 2.
Buy the Soundcore Boom 2 at $99.99 if you want a large speaker. Buy the Bose Soundlink Flex 2nd gen at $159 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 2nd gen | |
|---|---|---|
| Price | $99.99 | $159.00 |
| Ranked | #10 of 120 in Large Size Portable Bluetooth Speakers | #37 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Bass Extension (-10dB) | 47Hz | - |
| Battery Life | 24 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC, AAC, aptX Adaptive |
| Built-in Microphone | No | Yes |
| EQ | Yes | Yes (3 band) |
| IP Rating | IPX7 | IP67 |
| Bluetooth Latency | 125ms | - |
| Maximum SPL | 105dB (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 (586 g) |
| Bluetooth Version | 5.3 | 5.3 |
| 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 | 60mm full-range driver with 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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