Bluetooth Speakers / Bose SoundLink Flex (2nd Gen) vs JBL Boombox 4
Bose SoundLink Flex (2nd Gen) vs JBL Boombox 4
JBL Boombox 4
210W, 34 hours and a swappable battery — the loudest thing here.
Wins overall by 0.9 points
Quick Verdict
The JBL Boombox 4 takes this by a clear 0.9 points. 210W, 34 hours and a swappable battery — the loudest thing here. The Bose SoundLink Flex (2nd Gen) only makes sense if it wins on a category you care about more than the total.
The Bose SoundLink Flex (2nd Gen) and JBL Boombox 4 are both closely matched bluetooth Speaker models, and the Bose SoundLink Flex (2nd Gen) is $391 cheaper than the JBL Boombox 4 ($159 vs $549.95). On Portability, the Bose SoundLink Flex (2nd Gen) leads (8.5 vs 3.5/10) — weight, size and how easily it travels. On Battery, the JBL Boombox 4 leads (9.5 vs 5.5/10) — rated playtime and how it holds up at real listening volume. On Loudness, the JBL Boombox 4 leads (9.8 vs 6.5/10) — maximum usable volume before it strains. Overall, the JBL Boombox 4 scores 8.1/10 across our 8 scoring categories versus 7.2/10 for the Bose SoundLink Flex (2nd Gen). Below, we break down the full spec sheet, category-by-category scores, and exactly who should buy which one.
Side-by-Side Comparison
| Spec | Bose SoundLink Flex (2nd Gen) | JBL Boombox 4 |
|---|---|---|
| Price | $159.00 | $549.95 |
| Release Year | 2024 | 2025 |
| Battery Life (hrs) | 12 | 28✓ |
| Water & Dust Rating | IP67 — dust and water | IP68 — dust and water |
| Floats | Yes | Not confirmed |
| Power Output (W) | Bose does not publish power ratings for any SoundLink speaker | 210W on mains (2x 65W woofers plus 2x 40W tweeters), 200W on battery |
| Weight (g) | 585✓ | 5890 |
| Bluetooth | 5.3 | 5.4 (SBC, AAC, LC3) |
| Drivers | Single full-range transducer with passive radiators; Bose does not publish driver dimensions | 2x 5-inch woofers plus 2x 0.75-inch tweeters and three passive radiators |
| Stereo & Multi-Speaker Pairing | Two compatible Bose speakers can run in Stereo Mode or Party Mode; there is no large-scale chaining | Auracast — stereo pair two Boombox 4s or link many Auracast JBL speakers |
| Speakerphone | Yes | No |
| App EQ | Yes | Yes |
| Charges Your Phone | No | Yes |
| Warranty | 12 months | 12 months |
| Colors | Black, Blue Dusk, Alpine Sage | Black, Blue, Brown |
Category Scores
Sound Quality
The JBL Boombox 4 leads clearly here, 8.5 against 8.0 — a 0.5-point margin on tonal balance, clarity and detail. If that is what you are buying for, the Bose SoundLink Flex (2nd Gen) does not close the gap elsewhere.
Bass
The JBL Boombox 4 leads clearly here, 9.5 against 6.5 — a 3.0-point margin on low-end weight and extension for the size. If that is what you are buying for, the Bose SoundLink Flex (2nd Gen) does not close the gap elsewhere.
Battery
The JBL Boombox 4 leads clearly here, 9.5 against 5.5 — a 4.0-point margin on rated playtime and how it holds up at real listening volume. If that is what you are buying for, the Bose SoundLink Flex (2nd Gen) does not close the gap elsewhere.
Durability
The Bose SoundLink Flex (2nd Gen) and JBL Boombox 4 are level here, at 9.0/10 each. IP rating, drop resistance and whether it floats is not what separates these two — look to the categories where the scores diverge.
Portability
The Bose SoundLink Flex (2nd Gen) leads clearly here, 8.5 against 3.5 — a 5.0-point margin on weight, size and how easily it travels. If that is what you are buying for, the JBL Boombox 4 does not close the gap elsewhere.
Loudness
The JBL Boombox 4 leads clearly here, 9.8 against 6.5 — a 3.3-point margin on maximum usable volume before it strains. If that is what you are buying for, the Bose SoundLink Flex (2nd Gen) does not close the gap elsewhere.
Features
The JBL Boombox 4 leads clearly here, 8.0 against 6.5 — a 1.5-point margin on app EQ, multi-speaker pairing, charge-out and extras. If that is what you are buying for, the Bose SoundLink Flex (2nd Gen) does not close the gap elsewhere.
Value
The Bose SoundLink Flex (2nd Gen) and JBL Boombox 4 are level here, at 7.0/10 each. performance and features relative to price is not what separates these two — look to the categories where the scores diverge.
Best For
Choose the Bose SoundLink Flex (2nd Gen) if…
- • Portability matters most to you — the Bose SoundLink Flex (2nd Gen) scores 8.5/10 here (weight, size and how easily it travels).
- • You want to spend less — it's $391 cheaper.
- • Your main use case is portable or poolside.
Choose the JBL Boombox 4 if…
- • Battery matters most to you — the JBL Boombox 4 scores 9.5/10 here (rated playtime and how it holds up at real listening volume).
- • Loudness matters most to you — the JBL Boombox 4 scores 9.8/10 here (maximum usable volume before it strains).
- • Bass matters most to you — the JBL Boombox 4 scores 9.5/10 here (low-end weight and extension for the size).
- • Features matters most to you — the JBL Boombox 4 scores 8.0/10 here (app EQ, multi-speaker pairing, charge-out and extras).
- • Your main use case is party.
Pros & Cons
Bose SoundLink Flex (2nd Gen)
Pros
- +The best tonal balance of any small speaker here — Bose's core strength
- +PositionIQ genuinely works, retuning whether it is upright, flat or hanging
- +Floats, with a full IP67 rating
- +App EQ finally added this generation
Cons
- −12 hours is short next to the Marshall's 32 or the Tribit's 24
- −Bose publishes no wattage or driver specification at all
- −No USB charge-out
- −No aux input
- −List price has risen from $149 to $159
JBL Boombox 4
Pros
- +Loudest and deepest-hitting speaker here by a clear margin
- +The battery pack is swappable, which is almost unheard of and hugely extends its useful life
- +Measured runtime exceeds 34 hours
- +IP68 and can run on mains while charging
Cons
- −5.9kg — this is a two-hands, plan-ahead speaker
- −The 3.5mm aux input was removed compared with the Boombox 3
- −No microphone
- −Not intended for TV use
- −Expensive at list price
Shop by Need
FAQs
Is the Bose SoundLink Flex (2nd Gen) or JBL Boombox 4 better overall?+
Based on our 8-category scoring, the JBL Boombox 4 comes out ahead overall. See the full breakdown in the scores section above — the right pick still depends on which categories matter most for your use case.
Which is better for Portability, the Bose SoundLink Flex (2nd Gen) or the JBL Boombox 4?+
The Bose SoundLink Flex (2nd Gen) scores higher on Portability (8.5/10 vs 3.5/10) — weight, size and how easily it travels.
Which is better for Battery, the Bose SoundLink Flex (2nd Gen) or the JBL Boombox 4?+
The JBL Boombox 4 scores higher on Battery (9.5/10 vs 5.5/10) — rated playtime and how it holds up at real listening volume.
Which is better for Loudness, the Bose SoundLink Flex (2nd Gen) or the JBL Boombox 4?+
The JBL Boombox 4 scores higher on Loudness (9.8/10 vs 6.5/10) — maximum usable volume before it strains.
Which is better for Bass, the Bose SoundLink Flex (2nd Gen) or the JBL Boombox 4?+
The JBL Boombox 4 scores higher on Bass (9.5/10 vs 6.5/10) — low-end weight and extension for the size.
Is the Bose SoundLink Flex (2nd Gen) worth the price difference over the JBL Boombox 4?+
The Bose SoundLink Flex (2nd Gen) is the cheaper option at $159 versus $549.95. Whether the pricier model is "worth it" depends on how much you value its lead in Portability.
Which is better suited to my use case?+
The Bose SoundLink Flex (2nd Gen) is the better fit if you mainly care about portable or poolside. The JBL Boombox 4 is the better fit for party.
What's the warranty on the Bose SoundLink Flex (2nd Gen) vs the JBL Boombox 4?+
The Bose SoundLink Flex (2nd Gen) ships with a 12-month warranty; the JBL Boombox 4 ships with a 12-month warranty. Always confirm current terms on the manufacturer's site before buying.
Should I wait for the next model instead of buying either of these?+
If either model is more than two years old, a successor may be close — check the "Latest Model" link on each product page. Otherwise, both are current, well-supported options and there's no strong reason to wait.
Cheaper Option
JBL Flip 7 — $149.95
Specifications and prices for both products last verified . Scores are calculated from published specifications — see how we compare products.