Short answer: the Ultimate Ears Boom 4 on rank and price, though neither ranks well in its class. It ranks #110 of 164 medium speakers at $149.99 against the Emberton II’s #123 of 164 at $144.99, and it is IP67 rated, floats and finally charges over USB-C instead of Micro-USB. It is not much of an improvement over the older Booms; the Emberton II counters with 30 hours of battery and a 20 minute quick charge for 4 hours. Both are rated below 3.0/5 among the 164 medium speakers, and the Earfun Uboom L, ranked #2 at $49.79, is a better place to start if sound quality matters.
Buy the Ultimate Ears Boom 4. It is rated higher for sound quality, and saving $5 with the Marshall Emberton II does not make up for the sound-quality gap.
There is a real battery-life gap here: the Marshall Emberton II is rated for 30 hours, the Ultimate Ears Boom 4 only 15 hours.
Still deciding? The full Portable Bluetooth rankings cover every ranked option.
Specifications Side By Side
| Marshall Emberton II | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $144.99 | $149.99 |
| Ranked | #123 of 164 in Medium Size Portable Bluetooth Speakers | #110 of 164 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Bass Extension (-10dB) | 62Hz | - |
| Battery Life | 30 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth Latency | 80ms | - |
| Maximum SPL | 88dB (measured by Alan Ross Reviews) | 85dBC (Manufacturer specified) |
| Party Mode | Yes (Marshall Stack) | - |
| Weight | 1.5 lbs (700 g) | 1.4 lbs (620 g) |
| IP Rating | IP67 | IP67 |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 5.1 |
| Bluetooth Codecs | SBC | SBC |
| Dimensions | 6.3” x 2.7” x 3” (160 x 68 x 76 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 2” full-range drivers + 2x passive radiators | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| TWS | No | Yes |
| EQ | Yes (3 presets via app) | Yes (via app) |
| Built-in Microphone | No | No |
| Stereo | Yes | Yes |
| Omnidirectional | Yes | No |
| Power Input | USB-C | USB-C |
| Power Bank | No | No |
| Aux Input | No | No |
| Amplifier Power | 20W | - |
| Digital Aux Input | No | No |
| Strap | No | Yes (built-in loop) |
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Prices on this page were last checked October 4, 2026 at 9:58 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
Marshall Emberton II: $144.99 Amazon eBay
Newer model: the Marshall Emberton III, ranked higher, rated 2.7/5.
Pros: 30 hour battery life: among the best in its class; a 20 min quick-charge gives 4 hours. IP67 rated, durable rubbery build using 50% recycled plastic. Measured bass extension of 62Hz (-10dB).
Cons: Strange unnatural echo-like sound coloration, bass not as deep as competitors. Not technically a 360 speaker, only front and rear. Not very loud.
Full Marshall Emberton II review and specifications →
| Amplifier Power | 20W |
|---|---|
| App | Yes |
| Aux Input | No |
| Bass Extension (-10dB) | 62Hz |
| Battery Life | 30 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Latency | 80ms |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 6.3” x 2.7” x 3” (160 x 68 x 76 mm) |
| Drivers | 2x 2” full-range drivers + 2x passive radiators |
| EQ | Yes (3 presets via app) |
| IP Rating | IP67 |
| Maximum SPL | 88dB (measured by Alan Ross Reviews) |
| Omnidirectional | Yes |
| Party Mode | Yes (Marshall Stack) |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | No |
| TWS | No |
| Weight | 1.5 lbs (700 g) |
- Links
- Reviews, Comparisons and Sound Samples
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Ultimate Ears Boom 4: $149.99 Amazon eBay
Older model: the Ultimate Ears Boom 3 (ranked lower, rated 2.9/5).
Pros: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. 15 hour battery. Customizable EQ and speaker-pairing via the UE app.
Cons: Not much improvement over the old ones. Weak bass extension and thuddy bass. Gets distorted above 90%
Full Ultimate Ears Boom 4 review and specifications →
| App | Yes |
|---|---|
| Aux Input | No |
| Battery Life | 15 hours (Manufacturer specified) |
| Bluetooth | Yes |
| Bluetooth Codecs | SBC |
| Bluetooth Version | 5.1 |
| Built-in Microphone | No |
| Digital Aux Input | No |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| EQ | Yes (via app) |
| IP Rating | IP67 |
| Maximum SPL | 85dBC (Manufacturer specified) |
| Omnidirectional | No |
| Power Bank | No |
| Power Input | USB-C |
| Stereo | Yes |
| Strap | Yes (built-in loop) |
| TWS | Yes |
| Weight | 1.4 lbs (620 g) |
- Links
- Reviews, Comparisons and Sound Samples
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