The Ultimate Ears WONDERBOOM 4 is the most rugged, take-anywhere speaker under $100, combining an IP67 rating with a floating, drop-proof body and omnidirectional 360-degree sound. It's punchy for its size and now charges over USB-C, making it the ideal companion for a hike, pool or shower. The downsides are that it's only a small step up from the Wonderboom 3 and still lacks app support, but as a grab-and-go durable speaker it's hard to beat.
Full review
Sound Quality
The Wonderboom 4's defining trait is its omnidirectional design. As SoundGuys explained, "it still features two drivers and two passive radiators in an omnidirectional design for 360-degree sound," so it throws audio evenly in all directions rather than firing forward. That makes it ideal for a group sitting around it – there's no wrong side, and placement is forgiving in a way the JBL Flip 6's directional drivers aren't.
For its size the sound is satisfying. SoundGuys found that "at quieter volumes at home, around 25% on my phone, the Wonderboom 4 sounds perfectly acceptable," and TechRadar went further, praising its "impressive sound quality" and "surprisingly punchy" bass. An Outdoor Boost mode lifts the midrange and treble for open spaces where bass dissipates. Consumer Reports was more measured, calling the overall sound "acceptable" with "obvious shortcomings," a reminder that this is a fun, rugged speaker rather than an audiophile one.
The omnidirectional layout does come with a subtle trade-off: because the sound radiates in every direction rather than being focused forward, it can feel slightly less direct and detailed than a front-firing speaker like the JBL Flip 6 when you're sitting right in front of it. But that same dispersion is exactly what makes it shine for a group sitting around it, and for casual outdoor listening the even coverage matters more than pinpoint imaging.
Battery Life and Power
Ultimate Ears rates the Wonderboom 4 for up to 14 hours of playback, and TechRadar backed that up with "solid battery life" in testing – enough for a full day on the trail or a weekend of intermittent use. The big practical upgrade this generation is the move to USB-C charging, which SoundGuys welcomed as "the change to a USB-C charging port is welcome," finally retiring the micro-USB port of older models.
Power is the area where it shows its size. SoundGuys was clear that it's best "for a solo hike or when it's just you and a few friends," not a party. It gets loud enough for a campsite or a bathroom, and Outdoor Boost helps outdoors, but it won't fill a large backyard the way a bigger speaker could – a limitation it shares with the other compact picks here. If you regularly need to cover a bigger group, pairing two Wonderboom 4 units helps, but a single Flip 6 will still go louder on its own.
Build Quality and Design
Durability is where the Wonderboom 4 truly stands apart. SoundGuys confirmed it "retains an IP67 protection rating and is still dust, drop, and water-proof," and crucially it floats – drop it in a pool and it bobs back to the surface. The squat, can-shaped body is wrapped in tough fabric with a chunky rubber base and a fabric loop on top for clipping or hanging.
It's genuinely built to be abused: bounced down a trail, splashed at the beach, knocked off a shelf. At around 424g it's light and pocketable, and the big rubber buttons on top are easy to operate with wet hands. For an active, outdoorsy buyer, this build is the whole point – it's the speaker you don't have to baby. Ultimate Ears also offers it in a range of bright colors, which makes it easy to spot on a crowded beach blanket or campsite table.
What Reviewers Loved
TechRadar's 4.5-star verdict captured the consensus: "its simplicity, portability and durability make it a great choice to travel with," concluding that "for its size and price, the Wonderboom 4 is one of the best Bluetooth speakers you can buy." The appeal is in how little it asks of you – pair it once and it just works, anywhere, in any weather.
SoundGuys, while noting the modest generational changes, still recommended it as "a durable, ultra-portable, and convenient speaker." The 360-degree sound, the floating IP67 body and the no-fuss operation are the features reviewers keep coming back to. A new Podcast mode optimizes spoken-word audio, a small but thoughtful touch for audiobook and podcast listeners. RTINGS even ranks it among the best Bluetooth speakers under $100 overall, a reflection of how well its durability-first design resonates in this price band.
Where It Falls Short
The Wonderboom 4's biggest knock is that it's a minor upgrade. SoundGuys put it plainly: "the new Ultimate Ears Wonderboom 4 doesn't offer many upgrades over the 3, and the UE app still doesn't support it." The lack of app support is a real omission – there's no EQ, no firmware tuning, no custom controls, so what you hear out of the box is what you get.
It's also Bluetooth-only with no aux input and no speakerphone, and its compact drivers cap how loud and full it can get. Anyone hoping to fill a large space, dial in their own EQ, or plug in a wired source will be better served by the JBL Flip 6 or a larger speaker. The Wonderboom 4 trades versatility for ruggedness and simplicity.
Connectivity and Extras
The Wonderboom 4 keeps things deliberately simple: Bluetooth 5.2 with a long 131-foot (40 m) range and one-touch Outdoor Boost and Podcast modes accessed via the buttons on top. There's no aux input and no microphone, in keeping with its rugged, no-fuss philosophy. You can wirelessly pair two Wonderboom 4 units together to double the sound for a small gathering.
The notable absence is app support. As SoundGuys flagged, "the UE app still doesn't support it," so unlike the JBL Clip 5 there's no custom EQ or firmware tuning – what you hear out of the box is final. For some buyers that simplicity is a feature, not a bug; for those who like to tweak their sound, it's a real limitation. The move to USB-C charging this generation is the most meaningful connectivity upgrade.
How It Compares to Alternatives
The Wonderboom 4's natural rival here is the JBL Flip 6 – both are IP67-rated take-anywhere speakers around the same price. The Flip 6 is louder, has clearer vocals and supports multi-speaker pairing; the Wonderboom 4 counters with omnidirectional 360-degree sound, a floating body and a slightly more pocketable shape. Which wins comes down to whether you prioritize raw output (Flip 6) or maximum durability and even coverage (Wonderboom 4).
Against the smaller speakers in this guide – the JBL Clip 5, Sony SRS-XB100 and Anker Soundcore 2 – the Wonderboom 4 is tougher and fuller-sounding but larger and pricier. RTINGS even rates it as one of the best Bluetooth speakers under $100 overall, reflecting how well its durability-first formula lands in this price bracket.
Who It's Best For
The Wonderboom 4 is the pick for the active, outdoorsy buyer: hikers, campers, paddlers and poolside loungers who need a speaker that survives water, dust and drops and sounds the same no matter how it's positioned. Its floating IP67 body and 360-degree output make it the most genuinely take-anywhere option under $100.
It's a weaker fit if you want the loudest possible sound, custom EQ, or a wired input – there the JBL Flip 6 or a larger speaker make more sense. And if you already own the Wonderboom 3, the upgrade is too small to bother with. But for a first rugged speaker that you'll throw in a bag without a second thought, it's an excellent choice.
The floating, omnidirectional design also makes it a uniquely good poolside and water-activity speaker: drop it in and it bobs back, and wherever it ends up, everyone hears the same sound. For a buyer whose listening happens at the lake, the beach or the campsite rather than on a tidy desk, the Wonderboom 4's specific strengths line up almost perfectly, which is why it edges out the smaller speakers for that audience.
Strengths
- +Genuinely durable: IP67 dust- and waterproof rating plus a drop-proof, floating design
- +Omnidirectional 360-degree sound that stays consistent no matter how it's placed
- +Surprisingly punchy bass and Outdoor Boost mode for open spaces
- +Modern USB-C charging finally replaces the old micro-USB port
- +Compact, light and easy to clip or toss in any bag
Watch-outs
- −Only a modest upgrade over the Wonderboom 3
- −Still not supported by the Ultimate Ears companion app, so no EQ
- −Not powerful enough to fill a large room or big backyard
- −Bluetooth-only with no aux input or speakerphone
How it compares
The Ultimate Ears Wonderboom 4 is the durability champion of this group, matching the JBL Flip 6's IP67 rating but adding a floating, drop-proof design and omnidirectional 360-degree output the Flip 6's forward-firing drivers don't offer. It's more rugged and more pocketable than the Flip 6 but pushes less volume, and like the Sony SRS-XB100 and Anker Soundcore 2 it's aimed at personal and small-group listening rather than filling a space.
Who this is for
At a glance: Hikers, campers and poolside listeners who want the toughest, most weatherproof speaker under $100 with consistent 360-degree sound.
Why you’d buy the Ultimate Ears WONDERBOOM 4
- Genuinely durable: IP67 dust- and waterproof rating plus a drop-proof, floating design.
- Omnidirectional 360-degree sound that stays consistent no matter how it's placed.
- Surprisingly punchy bass and Outdoor Boost mode for open spaces.
Why you’d skip it
- Only a modest upgrade over the Wonderboom 3.
- Still not supported by the Ultimate Ears companion app, so no EQ.
- Not powerful enough to fill a large room or big backyard.
Rating sources
“Its simplicity, portability and durability make it a great choice to travel with, backed up by solid battery life and impressive sound quality. For its size and price, the Wonderboom 4 is one of the best Bluetooth speakers you can buy.”
“The Wonderboom 4 is still a durable, ultra-portable, and convenient speaker for a solo hike or when it's just you and a few friends.”
“Ultimate Ears's Wonderboom 4 had acceptable overall sound quality - this model reproduces music and dialog reasonably well despite the obvious shortcomings in its sound.”
Our 4.4 score is the average of these published ratings. Ratings marked * were derived from the reviewer’s written analysis or video transcript — the publisher didn’t print an explicit numeric score, so we inferred one from their own words. Click through to verify. More about methodology.
