Ultimate Ears Boom 3 vs Bose SoundLink Flex – Key Differences & Best Choice (2026)

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Brand	Ultimate Ears	Bose
Model No	Boom 3	SoundLink Flex
Wired / Wireless	Bluetooth Speaker Specification	Bluetooth Speaker Specification
Driver Type	Dynamic	Dynamic

Driver Diameter	NA	NA
Impedance	NA	NA
Sensitivity	90 dBC	NA
Frequency Response	90 Hz - 20000 Hz	NA
Maximum Power Input	5 V / 2A	NA
Maximum Power Output	90 W ( RMS ) Two 2” Drivers Two 2” x 4” Passive Radiators	High-Quality Audio
Signal to Noise Ratio	NA	NA

Wireless Technology	Bluetooth	Bluetooth
Bluetooth Version	5.0	4.2
Compatible Profiles	All Bluetooth Devices	All Bluetooth Devices
Supported Codecs	A2DP	NA
Battery Type	Lithium-Ion Batteries	Lithium-Ion Batteries
Bluetooth Range	45 Meters	9 Meters
Battery Life	15 Hours	12 Hours
Charging Time	2 Hours	4 Hours

Noise Cancelling	Passive	NA
Aux Connectivity	No	No
Weight	608 Gram	600 Gram
Dimensions	184 mm X 73 mm X 73 mm	90 mm X 201 mm X 52 mm
Available Colors	Black, Blue, Red, Pink	Black, White, Blue, Red
Accessories	Ultimate Ears Boom 3 Bluetooth Speaker Quick Start Guide	Bose SoundLink Flex Bluetooth Speaker USB-C To USB-A Charging Cable
Other Features	2-YEAR Limited Hardware warranty. BOOM 3 delivers loud and immersive 360Â° sound with deep and accurate bass, all carefully balanced so you can hear every note. BOOM 3 runs on the same battery cell technology as some of the most crave-worthy electric cars. BOOM 3 will stay powered and pumping tunes for 15 hours. BOOM 3 is completely waterproof and floats. Boasting an insane IP67 water and dustproof rating, it can be totally submerged in water for up to 30-minutes. The all-new Magic Button on BOOM 3 allows you to play, pause and skip tracks directly on the speaker. Just push for convenient control of any streaming music. Use PartyUp on the Ultimate Ears app to pair 2, 3, 4...and over 150 speakers for the ultimate sound experience. You can pair any generation of BOOM and MEGABOOM together. BOOM 3 is virtually indestructible. Itâ€™s passed more than 25 seriously tough durability tests, including thousands of button pushes, 100s of tumbles, multiple drop tests, and more.	Keeps up with you all day. Incredible sound in any position. Easy to Connect; lightweight but powerful sound. Rigorously tested to meet an IP67 rating, SoundLink Flex is waterproof and dustproof, inside and out. Its innovative transducer ensures the clearest possible sound, meaning you hear distinct instruments, nuances in the vocals, and balanced treble and bass.
	Compare Ultimate Ears Boom 3 with: Zebronics Zeb-Vibe Elista ELS TT-14000 AUFB Aiwa RS-X 100 Natsukasii Pro boAt PartyPal 65Pro Aiwa SBX-350 A	Compare Bose SoundLink Flex with: Aiwa RS-X 100 Natsukasii Pro Aiwa SBX-350 A boAt PartyPal 65Pro Elista ELS TT-14000 AUFB Zebronics Zeb-Vibe

Modern connectivity options make these systems flexible for different setups and devices. Both systems aim to provide room-filling sound suitable for various entertainment needs. Ultimate Ears Boom 3 and Bose SoundLink Flex are feature-rich speaker setups offering a combination of powerful sound, surround experience, and connectivity options. Variations in sound output and surround capabilities affect how immersive the audio experience feels. Audio enhancements and surround technologies improve clarity and spatial sound performance.

Verdict: Both systems are competitive, and the right option depends on your room size, usage, and feature requirements.

Top Differences

Bluetooth Version: 5.0 vs 4.2
Frequency Response: 90 Hz - 20000 Hz vs NA

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Top Differences