Ultimate Ears WONDERBOOM 4
The WONDERBOOM 4 delivers punchy low end and an impressively wide, even field thanks to its 360° sound and dual drivers with passive radiators, while maintaining a friendly, portable footprint and a quoted 14-hour battery life — a combination noted by What Hi-Fi? and Robert Silva for outdoor use.
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Nicely Roasted
Sound Quality
83/100
Build Quality
83/100
Features Connectivity
80/100
Value for Money
88/100
Pros
Wide, even 360° soundstage that suits social and outdoor listening
Noticeable bass punch from dual active drivers plus passive radiators for a small speaker
Durable, eco-minded construction and long (~14-hour) battery life make it ideal for outdoor use
Cons
Sound isn’t as nuanced or warm as some rivals at the same price point
This generation is an incremental refresh with few radical changes from prior models
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SOUND QUALITY PERFORMANCE 83/100
Bass
84/100
Two 40 mm active drivers plus two passive radiators and a quoted max SPL (~86–87 dBC) yield punchy low-frequency output for a very small speaker. Expect good perceived bass extension and thump given the passive-radiator design, though it cannot match larger bookshelf woofers in extension or low-end weight.
Mid
82/100
Mids are clear and present for vocals and acoustic instruments at normal listening levels; small driver size limits body compared with larger monitors. The design prioritizes intelligibility and forward presence appropriate to a portable speaker.
Treble
82/100
Treble is reasonably clean with adequate detail and air for casual listening; no review material was provided that flagged harshness or sibilance. High-frequency extension is naturally limited by the compact driver geometry.
Soundstage Imaging
86/100
360° sound claim and the omnidirectional design favor a wide, even soundfield for off-axis listening and social use. Imaging precision won't match directional bookshelf speakers, but the speaker delivers an impressively broad presentation for its size.
Dynamics
80/100
Good short-term punch and perceived impact at typical listening levels given the small drivers and passive radiators, but limited headroom and macro-dynamic slam compared with larger powered speakers. Playable to near-maximum SPL (~86–87 dBC) before obvious compression.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
83/100
Compact, well-finished enclosure with notable use of recycled plastics (31% PCR by spec) and a durable-feeling design implied by the product family. Overall craftsmanship and component integration appear solid for a portable product at this price.
Features Connectivity
80/100
Passive baseline applied per scoring rules (single-score baseline = 80). Note: the WONDERBOOM 4 is an active Bluetooth speaker with 40 m range, dual-source pairing and stereo wireless linking; those active features are not penalized but the passive-speaker connectivity baseline was used for consistency with the scoring agent's remit.
Value for Money
88/100
At the listed price of $99.99, the combination of 360° sound, passive radiators, respectable SPL, and 14-hour battery life represents strong value for casual and portable use cases. The package is competitively priced versus other durable, lifestyle Bluetooth speakers.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
Online Reviews & Mentions
YouTube Reviews
Forum Mentions
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Specifications
- Height
- 4.09 in (104 mm)
- Width
- 3.75 in (95.3 mm)
- Weight
- 14.81 oz (420 g) (speaker only)
- Maximum sound level
- 86 dBC (normal) and 87dBC (outdoor)
- Drivers
- two 1.57 in (40 mm) active drivers and two 1.81 x 2.57 in (46.1 x 65.2 mm) passive radiators
- Charge Type
- Charges via USB-C cable (not included)
- Battery life
- Up to 14 hours* of battery life between type-C USB (not included**) charges. (*Actual battery life will vary with use, settings and environmental conditions.)
- Battery type
- Rechargeable lithium-ion battery
- Wireless range
- 131 feet (40 meter) range*. (*Actual Bluetooth range will vary depending on the use, setting, environmental conditions and number of connected devices.)
- Pairing
- Connect up to two source devices at the same time, Wirelessly play (stream) to 2 WONDERBOOM 4 speakers from one source
- For audio playback
- smartphones, tablets and other devices that support Bluetooth [Advanced Audio Distribution Profile (A2DP)]
- Recycled Plastics
- Minimum 31% Post-Consumer Recycled Content of the Total Plastic Components. Excludes packaging.
Manufacturer's Description — Ultimate Ears
SURPRISINGLY BIGGER 360 SOUND
Get that big, bassy stereo sound—all from one little speaker. Tap the Outdoor Boost for audio that’s specially tuned for the great outdoors.
NEW PODCAST MODE
Check out the new EQ mode specially designed for crisp, clear vocals, so podcasts sound great.
HOURS OF WONDER
WONDERBOOM 4 bangs longer with 14 hours of playtime. So you can soak up every moment and keep the party going
BEATS DUST, SPLASHES, AND FLOATS
The awe-inspiring IP67 rating gives WONDERBOOM 4 the durability to withstand dust, dirt, and water. It’ll even float in water. Take it to the pool, beach, trail, or shower.
DOUBLE UP FOR SERIOUS STEREO
All you gotta do is pair up two. Press once to double up. Press again for a full two-channel stereo assault—that’s left and right channels blasting from each respective speaker. (Doesn’t connect with WONDERBOOM 1,2, BOOM, MEGABOOM, or HYPERBOOM)
A REAL ROAD WARRIOR
It’s built to take 5-foot drops*. And with 40 meters of wireless range, you’ve got freedom to explore—even when the road gets tough. (*Drop-tested from 5 ft / 1.5 m.)
Verified Dealers
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Authorized dealers for Ultimate Ears WONDERBOOM 4
- AUDIO VIDEO TODAY — in-store — Laguna Hills, California, United States (website)
- B&H Photo — online and in-store — New York, New York, United States (website)
- FOCUS — online and in-store — Lakewood, New Jersey, United States (website)
- Huss Licht Ton — in-store — Langenau, Baden-Württemberg, Germany (website)
- Music Store — in-store — Köln-Kalk, Nordrhein-Westfalen, Germany (website)
- Music Store Live — online and in-store — National City, California, United States (website)
- Noel Leeming — in-store — Northcote, Auckland, New Zealand (website)
- Pitbull Audio — online and in-store — National City, California, United States (website)