Short answer: the KEF Muo gen2 for cleaner loud playback, the Ultimate Ears Megaboom 4 for ruggedness and USB-C. The Megaboom 4 is IP67 rated, floats and finally uses USB-C charging, but it produces a lot of distortion at higher volumes. The Muo gen2 keeps KEF’s fixed treble and overall balance, though it still lacks deeper bass.
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 sound quality is the priority over the price, or the Ultimate Ears Megaboom 4 if the price is the priority over sound quality.
Skip the Ultimate Ears Megaboom 4 if sound quality matters to you. It ranks near the bottom of the 142 medium speakers.
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| KEF Muo gen2 | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $249.99 | $200 |
| Ranked | #76 of 142 in Medium Size Portable Bluetooth Speakers | #137 of 142 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 | SBC |
| IP Rating | IP67 | IP67 |
| Party Mode | Yes (Auracast) | Yes (PartyUp up to 50 speakers) |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| 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) | 3.4" x 3.4" x 8.9" (87 x 87 x 225 mm) |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | - |
| Maximum SPL | 90dB (Manufacturer specified) | 91dB (Manufacturer specified) |
| Aux Input | No | No |
| EQ | Yes | Yes (via app) |
| Power Input | USB-C | USB-C |
| Built-in Microphone | - | No |
Related Speaker Comparisons
How KEF Muo gen2 compares with other leading options:
- Earfun Uboom L vs KEF Muo gen2
- Soundcore Motion 300 vs KEF Muo gen2
- Soundcore Motion+ vs KEF Muo gen2
- Soundcore Boost “upgraded” 2021 vs KEF Muo gen2
- Denon Envaya DSB-250BT vs KEF Muo gen2
Prices on this page were last checked September 22, 2026 at 5:11 AM 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
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 →
| Amplifier Power | 40W |
|---|---|
| App | Yes |
| Aux Input | No |
| 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 |
| EQ | Yes |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) |
| IP Rating | IP67 |
| Maximum SPL | 90dB (Manufacturer specified) |
| Omnidirectional | No |
| Party Mode | Yes (Auracast) |
| Power Input | USB-C |
| Stereo | Yes |
| TWS | Yes |
| Weight | 1.6 lbs (740 g) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Ultimate Ears Megaboom 4: $200 Amazon eBay
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
Full Ultimate Ears Megaboom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 3.4" x 3.4" x 8.9" (87 x 87 x 225 mm) |
| Drivers | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 91dB (Manufacturer specified) |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Input | USB-C |
| Stereo | No |
| TWS | Yes |
| Weight | 2.4 lbs (1.1 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Megaboom 4 vs Doss Soundbox
- Ultimate Ears Megaboom 4 vs Doss Soundbox Pro
- Ultimate Ears Megaboom 4 vs Zealot S61
- Ultimate Ears Megaboom 4 vs Skullcandy Terrain
- Ultimate Ears Megaboom 4 vs Beats Pill+
- Ultimate Ears Megaboom 4 vs Walla Sound
- Ultimate Ears Megaboom 4 vs Ultimate Ears Roll 2
- Ultimate Ears Megaboom 4 vs Xdobo X8
- See all 93 comparisons