Short answer: the Bose Soundlink Flex 2nd gen. It ranks #35 of 144 medium speakers by sound quality, rated 3.8/5, at $159. The Treblab HD77 ranks #82, rated 3.1/5, at $69.97, $89.03 cheaper, a saving that is not big enough to make up the sound-quality gap.
What the Bose Soundlink Flex 2nd gen does well: A very portable 586g, IP67-rated speaker with a clear, well-balanced midrange that keeps voices and instruments intelligible. The tradeoff: 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.
The case for the Treblab HD77: Supports TWS pairing with a second HD77 for wider stereo sound. The catch: Lacking quite a bit of bass compared to higher ranked speakers.
Buy the Bose Soundlink Flex 2nd gen. It is rated higher for sound quality, and saving $89.03 with the Treblab HD77 does not make up for the sound-quality gap.
There is a real battery-life gap here: the Treblab HD77 is rated for 20 hours, the Bose Soundlink Flex 2nd gen only 12 hours.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Bose Soundlink Flex 2nd gen | Treblab HD77 | |
|---|---|---|
| Price | $159.00 | $69.97 |
| Ranked | #35 of 144 in Medium Size Portable Bluetooth Speakers | #82 of 144 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | Yes (3 band) | No |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Bose Party mode) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No (front/rear drivers) |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (586 g) | 1.4 lbs (637 g) |
| Bluetooth Version | 5.3 | 5.0 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 7.4” x 3” x 3” (187 x 76 x 76 mm) |
| Aux Input | No | Yes |
| Drivers | 60mm full-range driver with passive radiators | 2x 48mm fullrange |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC (additional codecs unverified) |
| Digital Aux Input | No | No |
| Strap | Yes (built-in loop) | - |
| Bass Extension (-10dB) | - | ~66Hz |
| Wi-Fi | - | No |
| Frequency Response | - | 50Hz - 20kHz (Manufacturer specified) |
| Amplifier Power | - | 25W RMS |
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Prices on this page were last checked September 26, 2026 at 11:14 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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The Two Speakers In Full
Bose Soundlink Flex 2nd gen: $159.00 Amazon eBay
Older model: the Bose Soundlink Flex (rated 3.8/5).
Pros: A very portable 586g, IP67-rated speaker with a clear, well-balanced midrange that keeps voices and instruments intelligible. The second generation adds a Bose app with 3-band EQ, better-placed controls and stereo pairing with another Bose Soundlink Flex 2nd gen. It supports AAC and aptX Adaptive in addition to SBC, making it a stronger wireless option than most small rivals.
Cons: 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. The claimed battery life is only 12 hours, and some owners report accelerated standby drain after firmware updates. It is expensive for its size, so the added app and codec support, not a transformational sound upgrade over the original, are the main reasons to choose it.
Full Bose Soundlink Flex 2nd gen review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive |
| Bluetooth Version | 5.3 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) |
| Drivers | 60mm full-range driver with passive radiators |
| EQ | Yes (3 band) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Bose Party mode) |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.3 lbs (586 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen vs Flex More from Oluv’Sone →
- Oluv Patreon: Bose Soundlink Flex 2nd gen - sound demo
- Tô Thái Trí Hùng: Unbox & Sound Test - Bose Soundlink Flex 2
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen & Soundcore Motion 300 sound test
- Alan Ross: Hall of Fame classic vs latest Bose tech! More from alanrossreviews →
- CEONTHEMAKING: Bose Soundlink Flex 2nd Gen VS Marshall Emberton III - What’s NEW?? More from CEONTHEMAKING →
- Alan Ross - The Anti Shill!: Small speaker, mighty sound, The Flex gen 2 shatters physics!
- Head-to-Head Comparisons
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Treblab HD77: $69.97 Amazon eBay
Pros: Supports TWS pairing with a second HD77 for wider stereo sound. Aux input for wired listening. ~20 hour battery at low-medium volume; built-in mic for hands-free calls. Measured bass extension of ~66Hz (-10dB).
Cons: Lacking quite a bit of bass compared to higher ranked speakers. Unable to disable the music flashing lights
Full Treblab HD77 review and specifications →
| Amplifier Power | 25W RMS |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | ~66Hz |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC (additional codecs unverified) |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 7.4” x 3” x 3” (187 x 76 x 76 mm) |
| Drivers | 2x 48mm fullrange |
| EQ | No |
| Frequency Response | 50Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Omnidirectional | Yes |
| Power Input | USB-C |
| Stereo | No (front/rear drivers) |
| TWS | Yes |
| Weight | 1.4 lbs (637 g) |
| Wi-Fi | No |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons