Short answer: the Bose Soundlink Flex for ruggedness, the Teufel Rockster XS for a flatter tuning. The Flex is IP67 rated, floats and survives drops from several feet, but it is not stereo and sounds warm with overly boosted bass that drowns out midrange detail. The XS is a good sounding speaker, yet its bass is not quite as deep as others and it is only available in Europe.
Buy the Bose Soundlink Flex, since the Teufel Rockster XS is discontinued and only worth hunting down used.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Teufel Rockster XS | Bose Soundlink Flex | |
|---|---|---|
| Price | €180 Discontinued | $79.99 |
| Ranked | #34 of 157 in Medium Size Portable Bluetooth Speakers | #37 of 157 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | No |
| 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 | Yes | Yes |
| Bluetooth Codecs | aptX | SBC |
| 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) |
| Amplifier Power | 32W | - |
| Drivers | 65mm woofer + 20mm tweeter | 1x 60mm full-range driver + 2x passive radiators |
| IP Rating | IPX7 | IP67 |
| Digital Aux Input | No | No |
| App | No | Yes |
| EQ | No | No |
| TWS | Yes | Yes |
| Power Input | Micro USB | USB-C |
| Bass Extension (-10dB) | - | 56Hz |
| Built-in Microphone | - | Yes |
| Bluetooth Latency | - | 33ms |
| Maximum SPL | - | 96dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Bose Party mode) |
| Strap | - | Yes (built-in loop) |
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Prices on this page were last checked October 3, 2026 at 10:26 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
Teufel Rockster XS: €180 Discontinued eBay
Pros: Teufel Rockster XS uses 65mm woofer + 20mm tweeter. Its 720 g, claimed 14 hours (Manufacturer specified) battery life, IPX7 protection, aux input and stereo playback make it a practical option for its intended room or portable use. A good sounding speaker for its size.
Cons: There is no companion app. No EQ adjustment. Bass does not reach as deep as others, and it was only sold in Europe. Discontinued.
Full Teufel Rockster XS review and specifications →
| Amplifier Power | 32W |
|---|---|
| App | No |
| Aux Input | Yes |
| Battery Life | 14 hours (Manufacturer specified) |
| Bluetooth | Yes |
| 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) |
| Drivers | 65mm woofer + 20mm tweeter |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | No |
| Power Bank | Yes (USB-A) |
| Power Input | Micro USB |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.6 lbs (720 g) |
- Links
- Reviews, Comparisons and Sound Samples
- No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
- Head-to-Head Comparisons
- Teufel Rockster XS vs Tribit Xsound Plus 2
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- Teufel Rockster XS vs Soundcore Boom 3i
- Teufel Rockster XS vs JBL Charge Essential 2
- Teufel Rockster XS vs JBL Charge 5
- Teufel Rockster XS vs JBL Charge 5 Wifi
- Teufel Rockster XS vs Soundcore Motion 100
- Teufel Rockster XS vs Tribit Stormbox Pro
- See all 23 comparisons
Bose Soundlink Flex: $79.99 Amazon eBay
Newer model: the Bose Soundlink Flex 2nd gen, ranked higher, rated 3.8/5.
Pros: IP67 rated; rugged enough to survive drops from several feet and floats. Around 12 hours of battery at moderate volume. Measured bass extension of 56Hz (-10dB).
Cons: Not stereo. Warm sounding with overly boosted bass which drowns out midrange detail
Full Bose Soundlink Flex review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Bass Extension (-10dB) | 56Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| 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 |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) |
| 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 (589 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen vs Flex More from Oluv’Sone →
- Alan Ross Reviews: Bose Soundlink Flex Review! vs JBL Flip 6 and JBL Charge 5. Travel heaven?? 🤞 More from alanrossreviews →
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- Alan Ross Reviews: Tribit Xsound Mega vs the world! (JBL Charge 5, Bose Flex, Sony XB33, LG PL7) 👍
- Alan Ross Reviews: Bose Soundlink Flex vs Soundcore Boost vs Bogasing M4 - cheap or Bose?
- Alan Ross Reviews: Tribit Stormbox Flow has deeper bass than the Bose Flex but………..
- Jay’s Straight Up Reviews & More: Tribit Stormbox Flow vs Soundcore Motion 300 (LDAC) 😵 Budget Bose Soundlink Flex "Inspired" Speakers More from JaysStraightUpReviews →
- Oluv Patreon: Soundcore Motion 300 = Bose Soundlink Flex = Earfun UBoom L?
- Alan Ross Reviews: Bose Soundlink Flex or JBL Flip 6 (eq adjusted) or Denon Envaya - best speaker for travel!
- Alan Ross Reviews: Bose Soundlink Flex or Beosound A1 (1st gen) - ultimate compact speaker 😇
- Alan Ross Reviews: Bose Soundlink Flex or JBL Flip 6 (eq adjusted) or Denon Envaya - best speaker for travel!
- Jay’s Straight Up Reviews & More: Tribit Stormbox Flow vs Soundcore Motion 300 (LDAC) 😵 Budget Bose Soundlink Flex "Inspired" Speakers
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- Patricio Benadon: Bose SoundLink Flex vs. Mini 2 SE. Music audio quality sound test. Listen 4 different genres!
- Danny Pops: BEST Bose Speaker?? Bose Soundlink Flex vs micro, Color II, and revolve + More from DannyPops →
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- Joy & Oluv’Sone: JBL, Bose, B&O, Sonos, Earfun, SoundCore… which portable speaker sounds best?
- Alan Ross - The Anti Shill!: Small speaker, mighty sound, The Flex gen 2 shatters physics!
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