Marshall Emberton II vs Ultimate Ears Boom 4

Last updated: August 20, 2026

Short answer: the Ultimate Ears Boom 4. It ranks #88 of 136 medium speakers by sound quality at $105; the Marshall Emberton II ranks #100 and costs $159.99, so there is not much of a tradeoff to weigh.

What the Marshall Emberton II offers: 30 hour battery life, among the best in its class; a 20 min quick-charge gives 4 hours. Set against that: Strange unnatural echo-like sound coloration, bass not as deep as competitors.

The case for the Ultimate Ears Boom 4: IP67 rated, floats, and finally charges via USB-C instead of the older Booms’ Micro-USB. The catch: Not much improvement over the old ones.

Buy the Ultimate Ears Boom 4. It ranks higher for sound quality than the Marshall Emberton II and costs less, so there is no real case for the other one.

If battery life is a priority, the Marshall Emberton II is rated for 30 hours versus 15 hours for the Ultimate Ears Boom 4.

Marshall Emberton II vs Ultimate Ears Boom 4

Specifications Side By Side

Marshall Emberton II Ultimate Ears Boom 4
Price$159.99$105
Ranked#100 of 136 in Medium Size Portable Bluetooth Speakers#88 of 136 in Medium Size Portable Bluetooth Speakers
AppYesYes
Bass Extension (-10dB)62Hz-
Battery Life30 hours (Manufacturer specified)15 hours (Manufacturer specified)
Bluetooth Latency80ms-
Max Volume88dB85dBC
Party ModeYes (Marshall Stack)-
Weight1.5 lbs / 700 g1.4 lbs / 620 g
IP RatingIP67IP67
Bluetooth Version5.15.1
Bluetooth CodecsSBC-
Dimensions6.3" 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)
Drivers2x 2" full-range drivers + 2x passive radiators2x 1.57" (40mm) active drivers + 2x 1.81" x 2.57" (46.1 x 65.2mm) passive radiators
TWSNoYes
EQYes (3 presets via app)Yes (via app)
Built in MicrophoneNoNo
StereoYesYes
OmnidirectionalYesNo
Power InputUSB-CUSB-C
Power BankNoNo
Aux InputNoNo
Output Power20W-
Digital Aux InputNoNo

More useful head-to-heads from the same speaker class:

The Two Speakers In Full

Marshall Emberton II: $159.99 Amazon

Marshall Emberton II ranking card

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.

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.

AppYes
Aux InputNo
Bass Extension (-10dB)62Hz
Battery Life30 hours (Manufacturer specified)
Bluetooth CodecsSBC
Bluetooth Latency80ms
Bluetooth Version5.1
Built in MicrophoneNo
Digital Aux InputNo
Dimensions6.3" x 2.7" x 3" (160 x 68 x 76 mm)
Drivers2x 2" full-range drivers + 2x passive radiators
EQYes (3 presets via app)
IP RatingIP67
Max Volume88dB
OmnidirectionalYes
Output Power20W
Party ModeYes (Marshall Stack)
Power BankNo
Power InputUSB-C
StereoYes
TWSNo
Weight1.5 lbs / 700 g

As an eBay Partner, we may be compensated if you make a purchase.

Ultimate Ears Boom 4: $105 Amazon

Ultimate Ears Boom 4 ranking card

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%

AppYes
Aux InputNo
Battery Life15 hours (Manufacturer specified)
Bluetooth Version5.1
Built in MicrophoneNo
Digital Aux InputNo
Dimensions7.2" x 2.9" x 2.9" (184 x 73 x 73 mm)
Drivers2x 1.57" (40mm) active drivers + 2x 1.81" x 2.57" (46.1 x 65.2mm) passive radiators
EQYes (via app)
IP RatingIP67
Max Volume85dBC
OmnidirectionalNo
Power BankNo
Power InputUSB-C
StereoYes
TWSYes
Weight1.4 lbs / 620 g

As an eBay Partner, we may be compensated if you make a purchase.