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Ultimate Ears Boom 4 specifications and in-depth review

Ultimate Ears Boom 4

Manufacturer: Ultimate Ears

The Ultimate Ears Boom 4 is a wireless portable speaker designed for use in a variety of environments. Weighing 620 g and measuring 184 mm in height, it offers a solid, cylindrical build with on-device controls and IP67 ingress protection, making it resistant to both dust and water immersion. A two-year warranty and rechargeable battery round out its core design profile.

On the technical side, the Boom 4 houses four 40 mm drivers and uses a passive radiator to support its frequency range of 60 Hz to 20,000 Hz, with a sound pressure level of 85 dB/mW. It connects via Bluetooth 5 with a maximum range of 45 meters and charges through a USB Type-C port in approximately three hours. The speaker also supports stereo pairing with a compatible unit, includes voice prompts, a sleep timer, and a battery level indicator, while operating entirely without a wired audio input or Wi-Fi connectivity.

Pros
  • IP67 rating provides full dust protection and resistance to water immersion, making it suitable for outdoor and wet environments
  • Bluetooth 5 with a 45-meter range allows reliable wireless playback from a considerable distance
  • Stereo pairing support lets two units be used together for wider sound coverage
  • A passive radiator extends low-frequency response down to 60 Hz without requiring a separate subwoofer
  • USB Type-C charging port offers a modern, widely compatible connection for power
  • A sleep timer and battery level indicator add practical convenience during everyday use
Cons
  • No advanced Bluetooth audio codecs are supported, including AAC, aptX, LDAC, or any of their variants
  • Wired audio input is entirely absent, with no 3.5 mm jack or AUX connection available
  • Wireless charging is not supported, requiring a physical cable for every charge
  • At 620 g, the speaker carries notable weight for a portable device
  • No fast pairing feature, which can make initial or repeated Bluetooth connections less convenient
  • A travel bag is not included, offering no dedicated protection for transport
Who is this for?

This speaker is well-suited to users who frequently take it outdoors or into wet and dusty environments, thanks to its IP67 ingress protection rating. The 45-meter Bluetooth 5 range makes it a practical choice for open spaces like gardens, patios, or poolside settings where the source device may not always be close at hand. Users who want to expand their setup will also appreciate the stereo pairing capability, and the 15-hour battery life supports extended listening sessions without needing access to a power source.

Who is this NOT for?

Users who prioritize high-fidelity wireless audio will find this speaker limiting, as it lacks support for any advanced Bluetooth codec — including AAC, aptX, and LDAC — which restricts audio transmission quality regardless of the source. It is also a poor fit for those who need wired audio connectivity, since neither a 3.5 mm input nor an AUX connection is available. Additionally, at 620 g, it may feel cumbersome for users looking for a truly lightweight speaker to carry during activities like hiking or travel, especially without an included travel bag for protection.

Design:

Ingress Protection (IP) rating IP67
volume 980.536 cm³
drivers count 4
driver unit size 40 mm
has a neodymium magnet ✕
control panel placed on a device ✓
water resistance Water resistant
travel bag is included ✕
has a touch screen ✕
warranty period 2 years
has RGB lighting ✕
has a detachable cable ✕
is a neckband speaker ✕
has a remote control ✕
weight 620 g
height 184 mm
width 73 mm
thickness 73 mm

The Ultimate Ears Boom 4 has a cylindrical form factor measuring 184 mm in height and 73 mm in both width and thickness, with a total volume of 980.536 cm³ and a weight of 620 g. It carries an IP67 ingress protection rating, confirming water resistance against immersion in addition to dust. The speaker integrates a physical control panel directly on the device and houses four 40 mm drivers, though it does not use a neodymium magnet. No travel bag, remote control, touchscreen, detachable cable, or RGB lighting is included, and it is not a neckband-style speaker. A two-year warranty is provided with the product.

Sound quality:

has stereo speakers ✓
has a subwoofer ✕
highest frequency 20000 Hz
lowest frequency 60 Hz
Has a passive radiator ✓
has a noise-canceling microphone ✕
sound pressure level 85 dB/mW
has a magnetic shielding ✕

The Boom 4 supports stereo sound and covers a frequency range of 60 Hz to 20,000 Hz, with a passive radiator contributing to its low-end reproduction. The speaker delivers a sound pressure level of 85 dB/mW and does not include a dedicated subwoofer or magnetic shielding. A microphone is present but lacks noise-canceling capability.

Power:

Battery life 15 hours
charge time 3 hours
has a battery level indicator ✓
has a rechargeable battery ✓
has a removable battery ✕
has wireless charging ✕

The Boom 4 is equipped with a built-in rechargeable battery offering 15 hours of battery life, with a full charge taking approximately 3 hours. A battery level indicator is included to help monitor remaining charge. The battery is not removable, and wireless charging is not supported.

Connectivity:

Bluetooth version 5
supports Bluetooth pairing using NFC ✕
has a socket for a 3.5 mm audio jack ✕
has an AUX input ✕
has aptX Lossless ✕
has LDAC ✕
has aptX Adaptive ✕
has aptX HD ✕
has aptX ✕
has aptX Low Latency ✕
has AAC ✕
has AirPlay ✕
maximum Bluetooth range 45 m
supports Wi-Fi ✕
USB ports 1
Has USB Type-C ✓
has a 3.5mm male connector ✕
has an external memory slot ✕
is DLNA-certified ✕
supports Ethernet ✕
has a microphone input ✕

The Boom 4 connects wirelessly via Bluetooth 5 with a maximum range of 45 meters, and charges through a single USB Type-C port. It does not support NFC pairing, Wi-Fi, AirPlay, Ethernet, or DLNA, and no wired audio input is available — there is no 3.5 mm jack, AUX input, 3.5 mm male connector, or microphone input. On the codec side, none of the advanced Bluetooth audio formats are supported, including aptX, aptX HD, aptX Adaptive, aptX Lossless, aptX Low Latency, LDAC, or AAC. External memory expansion and a dedicated memory slot are also absent.

Features:

Can be used wirelessly ✓
supports a remote smartphone ✓
has fast pairing ✕
has voice commands ✕
Has a radio ✕
Has voice prompts ✓
has a mute function ✕
works as a power bank ✕
has a sleep timer ✓

The Boom 4 operates wirelessly and supports smartphone remote control, allowing playback management from a paired device. It includes voice prompts for audio feedback and a sleep timer for timed shutoff. Fast pairing, voice commands, a mute function, built-in radio, and power bank functionality are not available on this speaker.

Miscellaneous:

supports pairing for stereo sound ✓

The Boom 4 supports stereo pairing, allowing two compatible units to be linked together for stereo sound playback.

Final Verdict

The Ultimate Ears Boom 4 is a rugged portable speaker built around practical outdoor use, with its IP67 waterproof rating and 45-meter Bluetooth 5 range standing out as its most compelling attributes for on-the-go listeners. A 15-hour battery life, stereo pairing support, and a modern USB Type-C charging port round out a feature set that serves casual, environment-exposed use cases well. That said, the absence of wired audio inputs, advanced Bluetooth codecs, and wireless charging places a ceiling on its appeal to more demanding users. Overall, the Boom 4 is a dependable choice for those whose priority is durability and wireless freedom in outdoor settings, as long as audiophile-grade streaming quality and connectivity flexibility are not primary concerns.

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