Short answer: the JBL Flip 4. It ranks #63 of 136 medium speakers by sound quality at $70; the KEF Muo gen2 ranks #73 and costs $249.99, which makes this an easy call rather than a real tradeoff.
What the JBL Flip 4 offers: Less bass than a Flip 5. Peaky lower treble. Watch for: Battery failures are common.
What the KEF Muo gen2 offers: KEF seemed to have fixed the rolled off treble and overall balance Watch for: Lacking deeper bass. Very thuddy bass. Appears to be the exact same hardware but with updated tuning. Bass distorts as volume increases, and the claimed 43Hz extension is really only audible at low listening volumes, with a few seconds of lag after volume changes. Loses most of its bass off-axis. Customer reviews are mixed, ranging from praise for detail at low volume to complaints of a boxy, hollow sound.
Buy the JBL Flip 4. It ranks higher for sound quality than the KEF Muo gen2 and costs less, so there is no real case for the other one.
There is a real battery-life gap here: the KEF Muo gen2 is rated for 24 hours, the JBL Flip 4 only 12 hours.
Specifications Side By Side
| JBL Flip 4 | KEF Muo gen2 | |
|---|---|---|
| Price | $70 Discontinued | $249.99 |
| Ranked | #63 of 136 in Medium Size Portable Bluetooth Speakers | #73 of 136 in Medium Size Portable Bluetooth Speakers |
| Aux Input | Yes | - |
| Bass Extension (-10dB) | 66Hz | - |
| Battery Life | 12 hours (Manufacturer specified) | 24 hours (Manufacturer specified) |
| Bluetooth Latency | 300ms | - |
| Party Mode | Yes (Connect+ up to 100 speakers) | Yes (Auracast) |
| Power Input | Micro USB | - |
| TWS | No | Yes |
| Weight | 1.1 lbs / 510 g | 1.6 lbs / 740 g |
| Bluetooth Version | 4.2 | 5.4 |
| Drivers | 2x 40mm fullrange | 1x 58x117mm racetrack woofer, 1x 20mm tweeter |
| Dimensions | 6.9" x 2.8" x 2.6" (175 x 70 x 65 mm) | 8.5" x 3.2" x 2.3" (216 x 82 x 59 mm) |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) | 43Hz - 20kHz (Manufacturer specified) |
| Output Power | 16W RMS | 40W |
| IP Rating | IPX7 | IP67 |
| Discontinued | Yes | - |
| Max Volume | 92dB | 90dB |
| Digital Aux Input | No | Yes (USB-C) |
| Omnidirectional | No | No |
| App | - | Yes |
| Bluetooth Codecs | - | SBC, aptX Adaptive up to 48 KHz 24 bit |
| Stereo | - | Yes |
Related Speaker Comparisons
More useful head-to-heads from the same speaker class:
- Bose Soundlink Revolve+ II vs JBL Flip 5
- JBL Charge 5 Wifi vs JBL Flip 5
- Turtlebox Ranger vs JBL Flip 5
- KEF Muo gen2 vs Tribit Stormbox 2
- JBL Charge 5 Wifi vs JBL Flip 4
Prices on this page were last checked August 27, 2026 at 10:09 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
JBL Flip 4: $70 Discontinued Amazon eBay
Pros: Less bass than a Flip 5. Peaky lower treble.
Cons: Battery failures are common. Discontinued.
Full JBL Flip 4 review and specifications →
| Aux Input | Yes |
|---|---|
| Bass Extension (-10dB) | 66Hz |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Latency | 300ms |
| Bluetooth Version | 4.2 |
| Digital Aux Input | No |
| Dimensions | 6.9" x 2.8" x 2.6" (175 x 70 x 65 mm) |
| Discontinued | Yes |
| Drivers | 2x 40mm fullrange |
| Frequency Response | 70Hz - 20kHz (Manufacturer specified) |
| IP Rating | IPX7 |
| Max Volume | 92dB |
| Omnidirectional | No |
| Output Power | 16W RMS |
| Party Mode | Yes (Connect+ up to 100 speakers) |
| Power Input | Micro USB |
| TWS | No |
| Weight | 1.1 lbs / 510 g |
- Links
- Reviews, Comparisons and Sound Samples
- DLX Willington: JBL Flip 5 vs Flip 4 :Sound Battle: Almost to the size of the JBL Charge 3? More from DLXWillington →
- GYMCADDY: Best $100 Speaker? JBL Flip 4 Vs Sony XB20 Vs UE WONDERBOOM Vs Altec Mini Lifejacket 2 More from GYMCADDY →
- GYMCADDY: Best $100 Speaker? JBL Flip 4 Vs Sony XB20 Vs UE WONDERBOOM Vs Altec Mini Lifejacket 2
- Reddit Search for JBL Flip 4 Review
- Head-to-Head Comparisons
KEF Muo gen2: $249.99 Amazon eBay
Pros: KEF seemed to have fixed the rolled off treble and overall balance
Cons: Lacking deeper bass. Very thuddy bass. Appears to be the exact same hardware but with updated tuning. Bass distorts as volume increases, and the claimed 43Hz extension is really only audible at low listening volumes, with a few seconds of lag after volume changes. Loses most of its bass off-axis. Customer reviews are mixed, ranging from praise for detail at low volume to complaints of a boxy, hollow sound.
Full KEF Muo gen2 review and specifications →
| App | Yes |
|---|---|
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 KHz 24 bit |
| Bluetooth Version | 5.4 |
| Digital Aux Input | Yes (USB-C) |
| Dimensions | 8.5" x 3.2" x 2.3" (216 x 82 x 59 mm) |
| Drivers | 1x 58x117mm racetrack woofer, 1x 20mm tweeter |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Max Volume | 90dB |
| Omnidirectional | No |
| Output Power | 40W |
| Party Mode | Yes (Auracast) |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.6 lbs / 740 g |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons