Short answer: the KEF Muo gen2. It ranks #97 of 175 medium speakers by sound quality (rated 3.1/5) at $249.99 and is still sold new; the Ultimate Ears Wonderboom ranks #112 (rated 2.9/5) and is discontinued, so it is only an option used. The Ultimate Ears Wonderboom’s replacement, the Ultimate Ears Wonderboom 4, is rated 2.9/5 at $74.50.
The KEF Muo gen2 is the longer-running option. KEF seemed to have fixed the rolled off treble and overall balance. It is rated for 24 hours of battery against 10 for the Ultimate Ears Wonderboom. It links with other speakers (Auracast), which the Ultimate Ears Wonderboom cannot. It has an adjustable EQ, which the Ultimate Ears Wonderboom lacks. The catch: Lacking deeper bass.
The Ultimate Ears Wonderboom is the lighter option. IP67 rated and floats. At 0.9 lbs (425 g) it weighs much less than the KEF Muo gen2 at 1.6 lbs (740 g). Watch for: Not stereo, barely any bass, recessed treble.
Buy the KEF Muo gen2. It is rated higher for sound quality, and the Ultimate Ears Wonderboom is discontinued, so it is only available used.
Looking for alternatives? See the complete Portable Bluetooth rankings.
Specifications Side By Side
| KEF Muo gen2 | Ultimate Ears Wonderboom | |
|---|---|---|
| Price | $249.99 | $79 Discontinued |
| Ranked | #97 of 175 in Medium Size Portable Bluetooth Speakers | #112 of 175 in Medium Size Portable Bluetooth Speakers |
| App | Yes | No |
| Battery Life | 24 hours (Manufacturer specified) | 10 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC, aptX Adaptive up to 48 kHz 24 bit | SBC (inferred; additional codecs unverified) |
| IP Rating | IP67 | IPX7 |
| Party Mode | Yes (Auracast) | No |
| Stereo | Yes | No |
| Omnidirectional | No | Yes |
| TWS | Yes | Yes |
| Digital Aux Input | Yes (USB-C) | No |
| Weight | 1.6 lbs (740 g) | 0.9 lbs (425 g) |
| Bluetooth Version | 5.4 | - |
| Drivers | 1x 58x117mm racetrack woofer, 1x 20mm tweeter | 2x 1.6” active drivers + 2x 1.8” x 2.6” passive radiators |
| Dimensions | 8.5” x 3.2” x 2.3” (216 x 82 x 59 mm) | 4” x 3.7” (102 x 93.5 mm) |
| Frequency Response | 43Hz - 20kHz (Manufacturer specified) | - |
| Amplifier Power | 40W | - |
| Maximum SPL | 90dB (Manufacturer specified) | - |
| Aux Input | No | No |
| EQ | Yes | No |
| Power Input | USB-C | Micro USB |
| Built-in Microphone | - | No |
| Strap | - | Yes (built-in loop) |
Related Speaker Comparisons
More worthwhile head-to-heads for KEF Muo gen2:
- 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 October 12, 2026 at 4:13 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
KEF Muo gen2: $249.99 Amazon $249.99 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 | Yes |
| 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 Wonderboom: $79 Discontinued eBay
Newer model: the Ultimate Ears Wonderboom 4, ranked higher, rated 2.9/5, released Jun 2024. See every Ultimate Ears Wonderboom, Boom and Megaboom generation.
Pros: IP67 rated and floats. Compact, light, and simple to use.
Cons: Not stereo, barely any bass, recessed treble. Dip at 9kHz. Low mid bass distortion. Not technically a 360 speaker, only front and rear. Discontinued.
Full Ultimate Ears Wonderboom review and specifications →
| Released | Nov 2017 (8 years ago) |
|---|---|
| App | No |
| Aux Input | No |
| Battery Life | 10 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 4” x 3.7” (102 x 93.5 mm) |
| Drivers | 2x 1.6” active drivers + 2x 1.8” x 2.6” passive radiators |
| EQ | No |
| IP Rating | IPX7 |
| Omnidirectional | Yes |
| Party Mode | No |
| Power Input | Micro USB |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 0.9 lbs (425 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Ultimate Ears Wonderboom vs Ultimate Ears Wonderboom 2
- Ultimate Ears Wonderboom vs Ultimate Ears Boom 4
- Ultimate Ears Wonderboom vs Ultimate Ears Wonderboom 3
- Ultimate Ears Wonderboom vs Ultimate Ears Boom 3
- Ultimate Ears Wonderboom vs Klipsch Groove
- Ultimate Ears Wonderboom vs Ultimate Ears Wonderboom 4
- Ultimate Ears Wonderboom vs Ultimate Ears Megaboom 3
- Ultimate Ears Wonderboom vs LG Xboom Grab
- See all 74 comparisons