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 Teufel Rockster Go 2 ranks #75, rated 3.2/5, at $99.99, $59.01 cheaper, a saving that is not big enough to make up the sound-quality gap.
The case for the Bose Soundlink Flex 2nd gen: A very portable 586g, IP67-rated speaker with a clear, well-balanced midrange that keeps voices and instruments intelligible. 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.
What the Teufel Rockster Go 2 does well: At 0.74 kg, the IP67 Rockster Go 2 is genuinely easy to carry, and its claimed 28-hour battery life, USB-C fast charging, stereo pairing, and tripod mount suit outdoor use. Watch for: There is no companion app or 3.5 mm input.
Buy the Bose Soundlink Flex 2nd gen. It is rated higher for sound quality, and the $59.01 you would save on the Teufel Rockster Go 2 does not close the gap.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Bose Soundlink Flex 2nd gen | Teufel Rockster Go 2 | |
|---|---|---|
| Price | $159.00 | $99.99 |
| Ranked | #35 of 144 in Medium Size Portable Bluetooth Speakers | #75 of 144 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes (Teufel Go) |
| Battery Life | 12 hours (Manufacturer specified) | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| Built-in Microphone | Yes | No |
| EQ | Yes (3 band) | Yes |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Bose Party mode) | Yes (Party Link, up to 100 speakers) |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (586 g) | 1.6 lbs (735 g) |
| Bluetooth Version | 5.3 | - |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Aux Input | No | No |
| Drivers | 60mm full-range driver with passive radiators | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| Bluetooth Codecs | SBC, AAC, aptX Adaptive | SBC, AAC |
| Digital Aux Input | No | Yes (USB-C sound card) |
| Strap | Yes (built-in loop) | Yes (detachable strap) |
| Discontinued | - | No |
| Power Bank | - | No |
| USB Playback | - | No |
| Amplifier Power | - | 8W |
| Frequency Response | - | 60Hz - 20kHz (Manufacturer specified) |
| Charging Time | - | 2.5 hours (Manufacturer specified) |
Related Speaker Comparisons
How Bose Soundlink Flex 2nd gen compares with other leading options:
- Bose Soundlink Flex 2nd gen vs Earfun Uboom L
- Bose Soundlink Flex 2nd gen vs Soundcore Motion 300
- Bose Soundlink Flex 2nd gen vs Soundcore Motion+
- Bose Soundlink Flex 2nd gen vs Soundcore Boost “upgraded” 2021
- Bose Soundlink Flex 2nd gen vs Minirig 4
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!
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Teufel Rockster Go 2: $99.99 Amazon eBay
Older model: the Teufel Rockster Go (rated 2.6/5).
Pros: At 0.74 kg, the IP67 Rockster Go 2 is genuinely easy to carry, and its claimed 28-hour battery life, USB-C fast charging, stereo pairing, and tripod mount suit outdoor use. Independent listening found a balanced, clear midrange and tuneful bass at sensible levels.
Cons: There is no companion app or 3.5 mm input. Reviewers found it loses some definition at maximum volume, and the claimed battery figure is optimistic for loud outdoor playback.
Full Teufel Rockster Go 2 review and specifications →
| Amplifier Power | 8W |
|---|---|
| App | Yes (Teufel Go) |
| Aux Input | No |
| Battery Life | 15 hours, 28 with Eco Mode (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC |
| Built-in Microphone | No |
| Charging Time | 2.5 hours (Manufacturer specified) |
| Digital Aux Input | Yes (USB-C sound card) |
| Dimensions | 8.3” x 4.3” x 2.4” (211 x 109 x 61 mm) |
| Discontinued | No |
| Drivers | 2x 50mm wide-band drivers + 1x 64mm passive radiator |
| EQ | Yes |
| Frequency Response | 60Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Omnidirectional | No |
| Party Mode | Yes (Party Link, up to 100 speakers) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (detachable strap) |
| TWS | Yes |
| USB Playback | No |
| Weight | 1.6 lbs (735 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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