Short answer: the Teufel Rockster XS. It ranks #31 of 136 medium speakers by sound quality; the Bose Soundlink Flex ranks #34.
The case for the Teufel Rockster XS: A good sounding speaker. Watch for: Not quite as deep of bass as others. Only available in Europe.
What the Bose Soundlink Flex offers: IP67 rated; rugged enough to survive drops from several feet and floats. The catch: Not stereo. Warm sounding with overly boosted bass which drowns out midrange detail.
Buy the Teufel Rockster XS if sound quality matters more than the price. Buy the Bose Soundlink Flex if the price matters more than sound quality.

Specifications Side By Side
| Teufel Rockster XS | Bose Soundlink Flex | |
|---|---|---|
| Price | €180 Discontinued | $89.00 |
| Ranked | #31 of 136 in Medium Size Portable Bluetooth Speakers | #34 of 136 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | - |
| Battery Life | 14 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| Power Bank | Yes (USB-A) | - |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| Weight | 1.6 lbs / 720 g | 1.3 lbs / 589 g |
| Bluetooth Codecs | aptX | - |
| Bluetooth Version | 4.0 | 4.2 |
| Dimensions | 2.7" x 3.4" x 7" (69 x 86 x 178 mm) | 7.9" x 3.5" x 2" (201 x 90 x 52 mm) |
| Output Power | 32W | - |
| Drivers | 65mm woofer + 20mm tweeter | 1x 60mm full-range driver + 2x passive radiators |
| IP Rating | IPX7 | IP67 |
| Discontinued | Yes | - |
| Digital Aux Input | No | No |
| App | - | Yes |
| Bass Extension (-10dB) | - | 56Hz |
| Built in Microphone | - | Yes |
| EQ | - | No |
| Bluetooth Latency | - | 33ms |
| Max Volume | - | 96dB |
| Party Mode | - | Yes (Bose Party mode) |
| Power Input | - | USB-C |
| TWS | - | Yes |
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The Two Speakers In Full
Teufel Rockster XS: €180 Discontinued
Pros: A good sounding speaker.
Cons: Not quite as deep of bass as others. Only available in Europe. Discontinued.
Full Teufel Rockster XS review and specifications →
| Aux Input | Yes |
|---|---|
| Battery Life | 14 hours (Manufacturer specified) |
| Bluetooth Codecs | aptX |
| Bluetooth Version | 4.0 |
| Digital Aux Input | No |
| Dimensions | 2.7" x 3.4" x 7" (69 x 86 x 178 mm) |
| Discontinued | Yes |
| Drivers | 65mm woofer + 20mm tweeter |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Output Power | 32W |
| Power Bank | Yes (USB-A) |
| Stereo | Yes |
| Weight | 1.6 lbs / 720 g |
As an eBay Partner, we may be compensated if you make a purchase.
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Bose Soundlink Flex: $89.00 Amazon
Pros: IP67 rated; rugged enough to survive drops from several feet and floats. Around 12 hours of battery at moderate volume.
Cons: Not stereo. Warm sounding with overly boosted bass which drowns out midrange detail
Full Bose Soundlink Flex review and specifications →
| App | Yes |
|---|---|
| Bass Extension (-10dB) | 56Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Latency | 33ms |
| Bluetooth Version | 4.2 |
| Built in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 7.9" x 3.5" x 2" (201 x 90 x 52 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators |
| EQ | No |
| IP Rating | IP67 |
| Max Volume | 96dB |
| Omnidirectional | No |
| Party Mode | Yes (Bose Party mode) |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 1.3 lbs / 589 g |
As an eBay Partner, we may be compensated if you make a purchase.
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