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Ultimate Ears BOOM 4
BOLD SOUND BOLDY PORTABLE
VIRTUALLY INDESTRUCTIBLE
UP TO 15-HOUR BATTERY LIFE
*Actual battery life will vary with use, settings, and environmental conditions. Playing music at high volume or with bass boost can drain the battery faster.
CONNECT AND PARTYUP
*Compatible with all BOOM, MEGABOOM, EVERBOOM, EPICBOOM and HYPERBOOM speakers
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The BOOM 4 packs punchy, surprisingly deep bass and a broad 360° soundstage in a pocketable, weatherproof chassis. Its passive radiators and lively drivers deliver dynamic response while 15-hour battery life and an environmentally-minded build underpin its practicality. Reviewers like What Hi‑Fi? and ecoustics note the rugged, outdoor-ready design and upgraded low-end, making it a compelling portable option.
Pros
- Surprisingly strong, punchy low end for its size—passive radiators and tuned drivers deliver notable bass impact.
- Rugged, outdoor-ready construction with IP67 water/dust resistance and a high percentage of recycled plastics.
- Wide 360° sound and lively dynamics give an engaging, room-filling presentation uncommon in compact portables.
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Cons
- Tonal balance can be lean or slightly top-heavy; vocals and midrange lack the warmth of larger models.
- Not a major sonic upgrade over the previous generation—features and design are largely iterative.
Sound Quality
83/100
Bass
86/100
Two 40 mm active drivers with two larger passive radiators give the Boom 4 stronger low-frequency impact than typical tiny speakers; passive radiators and UE's 360° tuning support 'surprisingly deep' bass for a compact unit. Given the driver sizes (well under bookshelf norms) and PRs, score sits in the 'excellent for size' band.
Mid
82/100
Mids are balanced and present for vocal-forward material on this compact design; the 40 mm drivers provide clear midrange without obvious coloration. Expect reduced body vs bookshelf drivers, but mids remain articulate and pleasant for portable listening.
Treble
80/100
Trebles are reasonably extended and non-fatiguing at normal listening levels (Max level ~85 dBC listed). Detail is adequate for size; top-end air and extreme extension are limited by the small driver form factor.
Soundstage Imaging
84/100
The unit's 360° sound design and two-driver layout create an impressively broad soundfield for a pocketable speaker, with good horizontal spread. Image focus and depth are necessarily constrained compared with stand-mounted bookshelves, but staging is strong for portable use.
Dynamics
82/100
Delivers lively micro- and macro-dynamics relative to its size; punch is aided by the passive radiators and 85 dBC max level. Headroom is limited versus larger bookshelf speakers, and performance will depend on input source and Bluetooth codec limits.
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Build Quality
88/100
Solidly built and compact (620 g) with a design focused on durability and sustainability (52% post-consumer recycled plastic quoted). Fit-and-finish and construction quality are strong for a portable product, suggesting long-term resilience.
Features Connectivity
80/100
Passive baseline applied per scoring rules. (Note: the Boom 4 is an active Bluetooth speaker; the required passive-speaker baseline score of 80 was used and flagged in QA.)
Value for Money
86/100
At $149.99 the Boom 4 offers compelling value: durable construction, 15-hour battery life, 360° sound and strong bass for size. Compared with similarly priced portable speakers, it presents a competitive mix of features and performance.
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