Ultimate Ears Boom 4 - Powerful and balanced sound

Powerful, balanced audio performance is delivered by the Ultimate Ears BOOM 4 portable Bluetooth speaker, engineered for immersive sound and rugged outdoor use. A cylindrical design is used to produce spatial 360° sound that radiates evenly in all directions, ensuring consistent audio coverage in any environment. Deep, accurate bass is generated without distortion, while dual active drivers and passive radiators work together to maintain clarity at both low and high volumes. Whether used indoors or outdoors, a bold and dynamic listening experience is consistently provided.

Durability and portability are combined with smart functionality to support active lifestyles. An IP67 rating ensures the speaker is waterproof, dustproof, floatable, and drop-resistant, allowing use in demanding conditions such as beaches, pools, and outdoor adventures. Extended listening is supported by up to 15 hours of battery life on a single charge, while PartyUp technology allows multiple compatible Ultimate Ears speakers to be wirelessly connected for a larger, more immersive soundstage.

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Key Features 

Virtually Indestructible Design
An IP67-rated enclosure is used to protect the speaker from water, dust, and drops, while a floatable design allows worry-free use near water.

Spatial 360° Sound
Audio is evenly dispersed in all directions through a cylindrical speaker layout, delivering immersive, room-filling sound regardless of placement.

Deep and Accurate Bass
Punchy, rich bass is produced using a combination of active drivers and passive radiators, ensuring depth without overpowering distortion.

Up to 15-Hour Battery Life
Long-lasting playback is supported with up to 15 hours of use per charge, keeping music playing throughout extended outings and events.
Actual battery life may vary based on volume, settings, and environmental conditions.

PartyUp Multi-Speaker Connectivity
PartyUp functionality allows one, two, or over 150 compatible Ultimate Ears speakers to be paired together using the UE | BOOM App for synchronized playback.

Magic Button One-Tap Control
Playback, pause, and track skipping are controlled directly from the speaker, while one-touch playlists can be accessed from supported streaming platforms.

Signature Sound with EQ Presets
Ultimate Ears Signature sound is supported alongside preset EQ modes such as Bass Boost, Cramped Space, Deep Relaxation, and Podcast/Vocal, all adjustable through the UE | BOOM App.

Made with Recycled Plastic
A minimum of 52% certified post-consumer recycled plastic is used in the speaker’s plastic components, excluding packaging, supporting more sustainable design practices.

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Product Specifications

Product Name
Ultimate Ears BOOM 4

Dimensions
Height: 7.24 in (184 mm)
Width: 2.9 in (73 mm)
Length: 2.9 in (73 mm)

Weight
21.87 oz (620 g) – speaker only

Battery Life
Up to 15 hours per charge*
Actual battery life may vary with usage, settings, and environment.

Battery Type
Rechargeable lithium-ion battery

Charging Method
USB-C charging (USB-C cable not included)

Maximum Sound Level
85 dBC (normal)*
Actual SPL may vary depending on environment.

Drivers
Two 1.57 in (40 mm) active drivers
Two 1.81 × 2.57 in (46.1 × 65.2 mm) passive radiators

Wireless Connectivity
Bluetooth audio playback

Wireless Range
Up to 147 ft (45 m)*
Actual range may vary depending on conditions and connected devices.

Compatibility
Smartphones, tablets, and other Bluetooth-enabled devices supporting A2DP

Water and Dust Resistance
IP67 rated (waterproof, dustproof, floatable)

Sustainability
Minimum 52% post-consumer recycled plastic content (excluding packaging)

Warranty
2-Year Limited Hardware Warranty

Available Part Numbers
Active Black: 984-001963
Cobalt Blue: 984-001967
Raspberry Red: 984-002004
Enchanting Lilac: 984-002009

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Conclusion
Designed for powerful audio performance and rugged portability, the Ultimate Ears BOOM 4 delivers immersive 360° sound, deep bass, and reliable durability in a compact form. With long battery life, multi-speaker connectivity, intuitive controls, and sustainable materials, a versatile and dependable portable speaker solution is provided for everyday listening and outdoor adventures alike.