Short answer: the KEF Muo gen2 for the higher ranking, the Ultimate Ears Megaboom 4 for the lower price. The KEF Muo gen2 ranks #72 of 134 medium speakers at $249.99. The Ultimate Ears Megaboom 4 ranks #130 at $200, $49.99 cheaper.
On the KEF Muo gen2 side: KEF seemed to have fixed the rolled off treble and overall balance. Set against that: Lacking deeper bass.
The case for the Ultimate Ears Megaboom 4: IP67 rated, floats, and finally uses USB-C charging. Set against that: A lot of distortion at higher volumes.
Buy the KEF Muo gen2 if the ranking matters more than the price. Buy the Ultimate Ears Megaboom 4 if the price matters more than the ranking.
Specifications Side By Side
| KEF Muo gen2 | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $249.99 | $200 |
| Ranked | #72 of 134 in Medium Size Portable Bluetooth Speakers | #130 of 134 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 24 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 KHz 24 bit | - |
| IP Rating | IP67 | IP67 |
| Party Mode | Auracast | Yes |
| Stereo | Yes | No |
| TWS | Yes | Yes |
| USB Audio | Yes | - |
| Weight | 1.6 lbs / 740 g | 2.4 lbs / 1.1 kg |
| Bluetooth Version | 5.4 | 5.1 |
| Drivers | 1x 58x117mm racetrack woofer, 1x 20mm tweeter | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| Dimensions | 8.5" x 3.2" x 2.3" (216 x 82 x 59 mm) | 3.43" x 3.43" x 8.86" (87 x 87 x 225 mm) |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) | - |
| Output Power | 40W | - |
| Max Volume | 90dB | 91dB |
| EQ | - | Yes (via app) |
| Power Input | - | USB-C |
| Built in Microphone | - | No |
The Two Speakers In Full
KEF Muo gen2: $249.99 Amazon
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
| App | Yes |
|---|---|
| Battery Life | 24 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 KHz 24 bit |
| Bluetooth Version | 5.4 |
| 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 |
| Output Power | 40W |
| Party Mode | Auracast |
| Stereo | Yes |
| TWS | Yes |
| USB Audio | Yes |
| Weight | 1.6 lbs / 740 g |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- KEF Muo gen2 vs B&O Beosound A1
- KEF Muo gen2 vs B&O Beosound Explore
- KEF Muo gen2 vs Bose Soundlink Revolve+ II
- KEF Muo gen2 vs Denon Envaya DSB-250BT
- KEF Muo gen2 vs JBL Charge 5 Wifi
- KEF Muo gen2 vs Sony ULT Field 3
- KEF Muo gen2 vs Tribit Stormbox Mini+
- KEF Muo gen2 vs Turtlebox Ranger
- KEF Muo gen2 vs B&O Beosound A1 2nd gen
- KEF Muo gen2 vs Huawei Sound Joy
- KEF Muo gen2 vs JBL Pulse 5
- KEF Muo gen2 vs Minirig 4
- KEF Muo gen2 vs Sony SRS-XB30
- KEF Muo gen2 vs B&O Beosound A1 3rd gen
- KEF Muo gen2 vs Harman Kardon Luna
- KEF Muo gen2 vs JBL Charge 5
- KEF Muo gen2 vs Marshall Emberton II
- KEF Muo gen2 vs Sonos Roam 2
- KEF Muo gen2 vs Ultimate Ears Megaboom 3
- Links
Ultimate Ears Megaboom 4: $200 Amazon
Pros: IP67 rated, floats, and finally uses USB-C charging. 20 hour battery life. ‘PartyUp’ feature syncs multiple UE speakers together.
Cons: A lot of distortion at higher volumes. Rolled off treble. Not very loud. They really screwed this up
| App | Yes |
|---|---|
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Version | 5.1 |
| Built in Microphone | No |
| Dimensions | 3.43" x 3.43" x 8.86" (87 x 87 x 225 mm) |
| Drivers | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Max Volume | 91dB |
| Party Mode | Yes |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 2.4 lbs / 1.1 kg |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.