Short answer: the Bose Portable Smart Speaker. It ranks #65 of 145 medium speakers by sound quality, rated 3.4/5, at $399. The Ultimate Ears Megaboom 4 ranks #140, rated 2.1/5, at $200, $199 cheaper, which does not close the gap in sound quality.
The case for the Bose Portable Smart Speaker: Both Alexa and Google Assistant are built in, and RTINGS rates its microphones as excellent at hearing commands from far away or in a noisy room. The catch: RTINGS found the out of the box tuning boomy and says it doesn’t get very loud; the app’s bass and treble sliders help, and SoundGuys recommended cutting bass by 10 to 20 steps to balance it.
What the Ultimate Ears Megaboom 4 does well: IP67 rated, floats, and finally uses USB-C charging. Watch for: A lot of distortion at higher volumes.
Buy the Bose Portable Smart Speaker. It is rated higher for sound quality, and saving $199 with the Ultimate Ears Megaboom 4 does not make up for the sound-quality gap.
Battery life favors the Ultimate Ears Megaboom 4: rated for 20 hours against 12 hours for the Bose Portable Smart Speaker.
There is a real gap in water resistance: the Ultimate Ears Megaboom 4 at IP67 (brief submersion) against the Bose Portable Smart Speaker, which has IPX4 (splashing).
Want more options? Browse the full Portable Bluetooth rankings.
Specifications Side By Side
| Bose Portable Smart Speaker | Ultimate Ears Megaboom 4 | |
|---|---|---|
| Price | $399.00 | $200 |
| Ranked | #65 of 145 in Medium Size Portable Bluetooth Speakers | #140 of 145 in Medium Size Portable Bluetooth Speakers |
| Aux Input | No | No |
| Battery Life | 12 hours (Manufacturer specified) | 20 hours (Manufacturer specified) |
| IP Rating | IPX4 | IP67 |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | Pointing up | Yes |
| Weight | 2.3 lbs (1.06 kg) | 2.4 lbs (1.1 kg) |
| Bluetooth Version | 4.2 | 5.1 |
| Dimensions | 7.6” x 4.7” x 4.1” (192 x 119 x 104 mm) (H x W x D) | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| App | Yes (Bose Music) | Yes |
| Built-in Microphone | Yes (far-field mic array, mic mute button) | No |
| Bluetooth Codecs | SBC, AAC | SBC |
| EQ | Yes (Bass/Treble) | Yes (via app) |
| Drivers | 1x high-excursion driver with 360-degree deflector + 3x passive radiators | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| Digital Aux Input | No | No |
| Wi-Fi | Yes | - |
| Voice Assistants | Amazon Alexa & Google Assistant | - |
| Party Mode | Yes (Bose Music multi-room, SimpleSync, AirPlay 2) | Yes (PartyUp up to 50 speakers) |
| Power Bank | No | - |
| Strap | No | Yes (built-in loop) |
| Streaming Services | AirPlay 2, Chromecast built-in, Spotify Connect, Amazon Music, Pandora, SiriusXM, TuneIn | - |
| TWS | - | Yes |
| Maximum SPL | - | 91dB (Manufacturer specified) |
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Prices on this page were last checked September 26, 2026 at 11:14 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
Bose Portable Smart Speaker: $399.00 Bose eBay
Pros: Both Alexa and Google Assistant are built in, and RTINGS rates its microphones as excellent at hearing commands from far away or in a noisy room. It works as a Wi-Fi speaker at home (AirPlay 2, Chromecast built-in, Spotify Connect) and as a Bluetooth speaker away from Wi-Fi, weighs about 1 kg with a carry handle, and is IPX4 splash resistant. SoundGuys measured 13 hours 6 minutes of playback at 75 dB, beating Bose’s 12 hour claim, and found the bass impressive for its size, especially near a wall or corner. Its 360 degree design spreads sound evenly around a room.
Cons: RTINGS found the out of the box tuning boomy and says it doesn’t get very loud; the app’s bass and treble sliders help, and SoundGuys recommended cutting bass by 10 to 20 steps to balance it. Pushed to full volume, Tom’s Guide heard unbalanced sound and Pocket-lint found the bass struggling and turning incoherent. RTINGS measured only about 5 hours of battery in its own test. It is mono, has no aux input (the USB-C port only charges), uses Bluetooth 4.2, and the Bose Music app supports a limited list of streaming services. IPX4 covers splashes only, not submersion or dust.
Full Bose Portable Smart Speaker review and specifications →
| App | Yes (Bose Music) |
|---|---|
| Aux Input | No |
| Battery Life | 12 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC |
| Bluetooth Version | 4.2 |
| Built-in Microphone | Yes (far-field mic array, mic mute button) |
| Digital Aux Input | No |
| Dimensions | 7.6” x 4.7” x 4.1” (192 x 119 x 104 mm) (H x W x D) |
| Drivers | 1x high-excursion driver with 360-degree deflector + 3x passive radiators |
| EQ | Yes (Bass/Treble) |
| IP Rating | IPX4 |
| Omnidirectional | Pointing up |
| Party Mode | Yes (Bose Music multi-room, SimpleSync, AirPlay 2) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | No |
| Strap | No |
| Streaming Services | AirPlay 2, Chromecast built-in, Spotify Connect, Amazon Music, Pandora, SiriusXM, TuneIn |
| Voice Assistants | Amazon Alexa & Google Assistant |
| Weight | 2.3 lbs (1.06 kg) |
| Wi-Fi | Yes |
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Ultimate Ears Megaboom 4: $200 Amazon eBay
Older model: the Ultimate Ears Megaboom 3 (ranked higher, rated 3/5).
Pros: IP67 rated, floats, and finally uses USB-C charging. 20 hour battery life. ‘PartyUp’ feature syncs multiple UE speakers together.
Cons: A lot of distortion at higher volumes. Rolled off treble. Not very loud. They really screwed this up
Full Ultimate Ears Megaboom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 20 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 3.4” x 3.4” x 8.9” (87 x 87 x 225 mm) |
| Drivers | 2x 50x50mm full-range + 2x 55x86mm passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 91dB (Manufacturer specified) |
| Omnidirectional | Yes |
| Party Mode | Yes (PartyUp up to 50 speakers) |
| Power Input | USB-C |
| Stereo | No |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 2.4 lbs (1.1 kg) |
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