Short answer: the Bose Soundlink Flex. It ranks #37 of 157 medium speakers by sound quality (rated 3.8/5); the Boat Stone 350 ranks #135 (rated 2.3/5).
The Bose Soundlink Flex is the better-sounding, deeper-bass option. IP67 rated; rugged enough to survive drops from several feet and floats. Its bass reaches about 56Hz before falling 10dB, against 87Hz for the Boat Stone 350. It is rated for 12 hours of battery against 6 for the Boat Stone 350. The tradeoff: Warm sounding with overly boosted bass which drowns out midrange detail.
The Boat Stone 350 is the lighter option. 10W cylindrical stereo speaker with dual passive radiators, IPX7 water resistance, microSD card slot, and 3.5mm aux input. At 0.9 lbs (426 g) it weighs noticeably less than the Bose Soundlink Flex at 1.3 lbs (589 g). It keeps a wired aux input, which the Bose Soundlink Flex lacks. It has an adjustable EQ, which the Bose Soundlink Flex lacks. Watch for: Midrange peaks with rolled-off treble.
Buy the Bose Soundlink Flex. It is rated higher for sound quality than the Boat Stone 350.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| Bose Soundlink Flex | Boat Stone 350 | |
|---|---|---|
| Price | $79.99 | - |
| Ranked | #37 of 157 in Medium Size Portable Bluetooth Speakers | #135 of 157 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Bass Extension (-10dB) | 56Hz | 87Hz |
| Battery Life | 12 hours (Manufacturer specified) | 6 hours (Manufacturer specified) |
| Built-in Microphone | Yes | Yes |
| EQ | No | Yes (multiple modes) |
| IP Rating | IP67 | IPX7 |
| Bluetooth Latency | 33ms | - |
| Maximum SPL | 96dB (measured by Alan Ross Reviews) | - |
| Party Mode | Yes (Bose Party mode) | - |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.3 lbs (589 g) | 0.9 lbs (426 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 4.2 | 5.0 |
| Dimensions | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) | 3.5” x 7.1” (90 x 180 mm) |
| Drivers | 1x 60mm full-range driver + 2x passive radiators | 2x 20mm tweeters + 2x 45mm drivers |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC (inferred; additional codecs unverified) |
| Aux Input | No | Yes |
| Strap | Yes (built-in loop) | No |
| MicroSD Playback | - | Yes |
| Amplifier Power | - | 10W |
Related Speaker Comparisons
How Bose Soundlink Flex compares with other leading options:
- Bose Soundlink Flex vs Earfun Uboom L
- Soundcore Motion 300 vs Bose Soundlink Flex
- Soundcore Motion+ vs Bose Soundlink Flex
- Soundcore Boost “upgraded” 2021 vs Bose Soundlink Flex
- Bose Soundlink Flex vs Minirig 4
Prices on this page were last checked October 2, 2026 at 10:18 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: $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 →
- Joy & Oluv’Sone: Bose Soundlink Flex 2nd gen vs Flex
- Alan Ross Reviews: Beats Pill vs Harman Luna vs Bose Flex vs Soundcore Motion Plus
- 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
- Patricio Benadon: Bose SoundLink Flex vs. Mini 2 SE. Music audio quality sound test. Listen 4 different genres!
- 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 →
- Alan Ross Reviews: Bose Soundlink Flex vs Minirig MK3 and Marshall Emberton - best bluetooth speaker?
- 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!
- Head-to-Head Comparisons
- Bose Soundlink Flex vs Bose Soundlink Flex 2nd gen
- Bose Soundlink Flex vs JBL Charge Essential 2
- Bose Soundlink Flex vs Tribit Xsound Plus 2
- Bose Soundlink Flex vs Huawei Sound Joy
- Bose Soundlink Flex vs Teufel Rockster XS
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- Bose Soundlink Flex vs Earfun Uboom Slim
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- See all 137 comparisons
Boat Stone 350 eBay
Pros: 10W cylindrical stereo speaker with dual passive radiators, IPX7 water resistance, microSD card slot, and 3.5mm aux input. Measured bass extension of 87Hz (-10dB).
Cons: Midrange peaks with rolled-off treble. Bass extension limited below 87Hz.
Full Boat Stone 350 review and specifications →
| Amplifier Power | 10W |
|---|---|
| App | No |
| Aux Input | Yes |
| Bass Extension (-10dB) | 87Hz |
| Battery Life | 6 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Bluetooth Version | 5.0 |
| Built-in Microphone | Yes |
| Digital Aux Input | No |
| Dimensions | 3.5” x 7.1” (90 x 180 mm) |
| Drivers | 2x 20mm tweeters + 2x 45mm drivers |
| EQ | Yes (multiple modes) |
| IP Rating | IPX7 |
| MicroSD Playback | Yes |
| Omnidirectional | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | Yes |
| Weight | 0.9 lbs (426 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
- Boat Stone 350 vs Boat Stone 352
- Boat Stone 350 vs Doss Soundbox Pro
- Boat Stone 350 vs Marshall Emberton II
- Boat Stone 350 vs Marshall Emberton III
- Boat Stone 350 vs Ultimate Ears Boom 4
- Boat Stone 350 vs Ultimate Ears Wonderboom 4
- Boat Stone 350 vs Soundcore 2
- Boat Stone 350 vs Sony ULT Field 1
- See all 29 comparisons