Wireless speakers / Compare

Marshall Emberton II vs Ultimate Ears BOOM 4

A

Product A: Marshall

Emberton II

49 of 96 known

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B

Product B: Ultimate Ears

BOOM 4

51 of 96 known

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Every value links to where we found it.

Only differences

AMarshall Emberton II

BUltimate Ears BOOM 4

General

5 of 8 differ

Series

Emberton1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

BOOM1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

1006234, 1006788, 1006237, 10067871Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026US Black and Steel page: pid and Product JSON-LD SKU 1006788. The US store sells it at 159.99 USD with an Add to Bag button (read 2026-10-23). Other colour SKUs are in the sources below.2Maker product pagemarshall.com/gb/en/product/emberton-iiRead 23 October 2026UK Black and Brass page: SKU 1006234.3Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026US Cream page: SKU 1006237.4Maker product pagemarshall.com/de/de/product/emberton-iiRead 23 October 2026German page Cream: SKU 1006787, which is the EU Cream SKU.

S001762Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

GTIN / EAN

Not available

Not available

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

3 May 20229Press articlenotebookcheck.net/Marshall-unveils-Willen-and-Emberton-II-speakers-with-Stack-Mode-feature.617447.0.htmlRead 23 October 2026Marshall revealed the speaker on 3 May 2022. SoundGuys lists the same release date.

26 June 20243Press releasenews.logitech.com/press-releases/news-details/2024/The-Rugged-Ultimate-Ears-EVERBOOM-Superior-Sound-That-Is-Waterproof-Dustproof-and-Floatable/default.aspxRead 8 October 2026

Status

Available1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026The maker still sells it next to the Emberton III. The support page says Released in 2022.

Available1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Ultimate Ears BOOM 38Reviewtrustedreviews.com/reviews/ultimate-ears-boom-4Read 10 October 2026Trusted Reviews says a successor to the UE Boom 3 finally arrived in the Boom 4.9Measurementrtings.com/speaker/reviews/ultimate-ears/boom-3Read 23 October 2026RTINGS shows a notice on the BOOM 3 page that it was replaced by the Ultimate Ears BOOM 4.

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Marshall Emberton III18Reviewwhathifi.com/news/rock-on-marshalls-third-gen-portable-speakers-are-here-to-rock-your-world-wherever-you-goRead 23 October 2026What Hi-Fi calls the Emberton III a sequel to the second-generation Emberton and says it is slightly larger than its predecessor.19Press articlet3.com/tech/bluetooth-speakers/marshall-emberton-3-reviewRead 23 October 2026T3's review calls the Emberton III the replacement for the Emberton II.

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$169.999Press articlenotebookcheck.net/Marshall-unveils-Willen-and-Emberton-II-speakers-with-Stack-Mode-feature.617447.0.htmlRead 23 October 2026Pre-order price 169.99 USD in North America. SoundGuys lists MSRP 169.99 USD. Tax treatment not stated.

$149.993Press releasenews.logitech.com/press-releases/news-details/2024/The-Rugged-Ultimate-Ears-EVERBOOM-Superior-Sound-That-Is-Waterproof-Dustproof-and-Floatable/default.aspxRead 8 October 2026US launch MSRP $149.99 before tax.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€16910Press articlenotebookcheck.com/Der-Marshall-Emberton-II-startet-mit-Stack-Modus-20-Watt-Leistung-und-30-Stunden-Laufzeit.616924.0.htmlRead 23 October 20263 May 2022 launch report: available now at a suggested retail price of 169 EUR. hifi.de also lists a German UVP of 169 euro. Tax treatment not stated.11Press articlehifi.de/news/marshall-emberton-2-bluetooth-nachfolger-mit-30-stunden-laufzeit-97115Read 23 October 2026Launch news: listed in the Marshall online shop with a UVP of 169 Euro.

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

US1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

ColoursiThe maker's own colour names

Black and Brass, Black and Steel, Cream1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table lists Black and Brass and Black and Steel. The page JSON-LD and RTINGS also list Cream.

Raspberry Red, Enchanting Lilac, Active Black, Cobalt Blue1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Speaker typeiHome covers speakers made to stay in one place, including smart speakers. A speaker with Wi-Fi or a voice assistant can be of any type.

Portable1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

Portable1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Audio

7 of 18 differ

Audio channelsiSound channels reproduced by one speaker. Pairing two speakers for stereo is separate.

Stereo1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Stereo/mono: Stereo. True Stereophonic is the multi-directional playback feature, not a wireless left and right pair.

Stereo4Reviewrtings.com/speaker/reviews/ultimate-ears/boom-4Read 8 October 2026Public Music verdict describes the single BOOM 4 unit stereo capabilities and soundstage performance. Two-unit stereo linking is a separate field and is not inferred from PartyUp.

Audio driversiPowered audio transducers in one speaker. Passive radiators are counted separately. Circular diameter and rectangular width and height have separate columns. Per-driver power must state continuous or RMS basis and battery or mains operation in the source note.

AMarshall Emberton II

Driver type	Count	Diameter (mm)
Dynamic full-range	2	50.8

Source1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Two 2 inch 10 W full range, driver type dynamic. The nominal 2 inch converts exactly to 50.8 mm. The per-driver 10 W has no continuous or RMS basis, so it is not stored per driver.

BUltimate Ears BOOM 4

Driver type	Count	Diameter (mm)
Active audio driver	2	40

Source1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026Specs and Compatibility: two 1.57 in (40 mm) active drivers and two 1.81 x 2.57 in (46.1 x 65.2 mm) passive radiators. Support page lists rounded 2 inch sizes. Rated power not published.2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Support Speaker Specifications: two active drivers and two passive radiators. Support lists a rounded 2 inch driver. The maker product page and Trusted Reviews give 40 mm, which is stored. The support passive radiator size of 2 x 4 inch also differs from the product page 46.1 x 65.2 mm, so the support sizes are treated as rounded.8Reviewtrustedreviews.com/reviews/ultimate-ears-boom-4Read 10 October 2026Full specs list 2x 40mm active drivers.

Passive radiatorsiPassive, unpowered bass radiators. Excludes powered drivers.

21Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

22Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Rated audio poweriMaker-published total rated continuous audio output. Battery power is used for portable speakers when mains and battery ratings differ. Peak marketing power is separate.

Not available

Not available

Rated audio power on mainsiTotal rated continuous audio output with external power. Store a separate battery rating when the maker publishes both.

Not available

Not available

Audio output power (unspecified rating)iMaker- or reviewer-published audio output power whose continuous or peak rating basis is not stated. This is separate from rated continuous output and explicitly published peak output.

20W1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Power amplifiers two 10 W Class D. Stored 20 as the sum of the two amplifiers. No continuous, RMS or peak basis is stated. Notebookcheck also reports 20 W.

Not available

Peak audio poweriExplicitly published peak audio output. Never substitute for rated continuous output.

Not available

Not available

Frequency response lower limit (claimed)iPublished acoustic frequency response limit. Tolerance and operating mode belong in the source note. The Bluetooth transmission range that some spec tables and retailers label Frequency Response, such as A2DP 20 to 20,000 Hz, is not stored.

60Hz1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Published frequency range 60-20,000 Hz. No tolerance stated. The separate 87 dB SPL at 1 m maker claim is not a measurement.

90Hz2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Maker claim 90 Hz to 20 kHz. No tolerance or test settings stated.

Frequency response upper limit (claimed)iPublished acoustic frequency response limit. Tolerance and operating mode belong in the source note. The Bluetooth transmission range that some spec tables and retailers label Frequency Response, such as A2DP 20 to 20,000 Hz, is not stored.

20kHz1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Published frequency range 60-20,000 Hz. No tolerance stated.

20kHz2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Maker claim 90 Hz to 20 kHz. No tolerance or test settings stated.

Signal-to-noise ratio (claimed)

Not available

Not available

Adjustable equalizeriUser-adjustable frequency bands. Selecting fixed sound presets alone does not qualify.

No1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Adjustable bass and treble controls: No. Customise sound: yes, equaliser presets in the app. Fixed presets only.

Yes2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Equalizer bandsiNumber of user-adjustable frequency bands. Do not count sound presets.

Not available

Not available

Automatic sound adjustmentiAdjusts audio to placement or playback conditions. Keep the named feature and conditions in the source note.

Not available

Not available

Sound modesiNamed playback modes. Battery extension modes are also qualified in battery source notes.

Marshall, Push, Voice13Reviewt3.com/reviews/marshall-emberton-ii-reviewRead 23 October 2026App presets: Marshall signature sound, Push (boosts bass and treble) and Voice. Fixed presets, no manual equalizer.

Signature, Bass Boost, Cramped Space, Deep Relaxation, Podcast/Vocal1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026Key features: Signature sound plus four pre-set EQ modes in the UE | BOOM app: Bass Boost, Cramped Space, Deep Relaxation and Podcast/Vocal.

Wireless stereo pairingiTwo compatible speakers can play separate left and right channels.

Not available

Not available

Speaker link protocolsiNamed systems for linking compatible speakers, such as PartyBoost, Auracast or Party Connect. Linking support does not establish compatibility across all models.

Stack mode5Owner's manualassets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdfRead 23 October 2026Page 7 Stack mode links two or more Emberton II speakers that play in sync. No maximum is stated.6Maker product pagemarshall.com/us/en/support/speakers/support-for-emberton-ii/how-to-use-stack-modeRead 23 October 2026Stack mode works only between Emberton II, Middleton (1st gen) and Willen (1st gen). Marshall recommends stacking the same model.

PartyUp1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026PartyUp compatible with BOOM, MEGABOOM, EVERBOOM, EPICBOOM and HYPERBOOM. Product page says over 150 speakers. The Getting Started guide says up to 150, see max_linked_speakers.

Max linked speakersiPublished maximum in a speaker group. A stereo pair is recorded separately. A figure such as 100+ is stored as 100.

Not available

1505Owner's manualsupport.logi.com/hc/en-us/articles/17139015562519-Getting-Started-UE-BOOM-4Read 10 October 2026UE | BOOM app section: Party Up pairs up to 150 speakers. Any BOOM, MEGABOOM, EVERBOOM, EPICBOOM or HYPERBOOM can join. Product page says over 150, the guide figure is stored. Linking is app based, so the Bluetooth group field is not set.

Max Bluetooth group speakersiPublished maximum speakers in one Bluetooth playback group, including the first speaker. Source notes name the compatible models or families, linking system and firmware requirements. Wi-Fi groups and concurrent Bluetooth source devices are excluded. A stereo pair alone does not establish the maximum when other Bluetooth linking systems are supported. A figure such as 100+ is stored as 100.

Not available

Not available

Connectivity

6 of 16 differ

Bluetooth audio playbackiPlays audio streamed over Bluetooth from a phone or other source. Bluetooth used only for setup or app control does not count.

Yes1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

Yes2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Bluetooth versioniVersion of the Bluetooth radio. Some Wi-Fi speakers use Bluetooth only for setup. See Bluetooth audio playback.

5.11Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Wireless connectivity Bluetooth 5.1.

5.02Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Bluetooth codecsiExplicitly supported receive codecs. Bluetooth version alone does not establish codecs.

SBC12Measurementsoundguys.com/marshall-emberton-ii-review-117005Read 23 October 2026Review: Bluetooth 5.1, SBC only, no multipoint. Mighty Gadget and Delamar also say SBC only.14Reviewmightygadget.com/marshall-emberton-ii-reviewRead 23 October 2026Review: limited to Bluetooth and only SBC.15Reviewdelamar.de/test/marshall-emberton-ii-testRead 23 October 2026Review: apart from SBC the speaker supports no further Bluetooth audio codecs.

SBC2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Bluetooth profiles

Not available

A2DP2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Bluetooth LE AudioiExplicit LE Audio support. Bluetooth LE for app control alone does not qualify.

Not available

Not available

AuracastiExplicit Auracast support. Sending, receiving and speaker-group roles belong in source notes.

Not available

Not available

MultipointiConcurrent Bluetooth source connections. Pairing memory and speaker-to-speaker linking do not qualify.

Not available

No4Reviewrtings.com/speaker/reviews/ultimate-ears/boom-4Read 8 October 2026Public Music/Outdoors verdict explicitly lists no Bluetooth multi-device pairing.

Multipoint source devicesiMaximum concurrently connected Bluetooth source devices, not remembered pairings.

Not available

Not available

Bluetooth range (claimed)iMaker-claimed Bluetooth range to the source device. Test conditions belong in the source note.

10m1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Bluetooth range 10 m / 30 ft. Delamar also found about ten metres.

45m2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Wi-FiiBuilt-in Wi-Fi, for audio streaming, setup or control.

No1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Wi-Fi No.16Reviewrtings.com/speaker/reviews/marshall/emberton-iiRead 23 October 2026Public header says Wi-Fi: No.

No4Reviewrtings.com/speaker/reviews/ultimate-ears/boom-4Read 8 October 2026Public Wi-Fi row explicitly says No.

Wi-Fi standardsiOne 802.11 name per item, such as 802.11ax. A Wi-Fi generation is written as its standard, so Wi-Fi 5 is 802.11ac and Wi-Fi 6 is 802.11ax. Older standards are listed only when a source names them.

Not available

Not available

Network audio protocolsiNamed systems that stream audio to the speaker over the home network. AirPlay is written as AirPlay 2. Chromecast built-in is written as Google Cast. Other names follow the maker, such as Spotify Connect.

Not available

Not available

USB audio inputiPlayback from a connected computer or phone through USB. Charging, service ports and USB flash-drive playback do not qualify.

No1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Wired connectivity No. The USB-C port is a power input in the manual.

No2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Connection Type is Bluetooth. Wireless speaker, charging by USB-C cable. USB-C is documented for charging only.

USB drive playbackiPlayback of audio files on a connected USB storage device.

No1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Wired connectivity No.

Not available

USB audio file formats

Not available

Not available

PortsiPhysical speaker connectors. Record charging, audio input, power output and service roles separately. A shared microphone and guitar jack is one port. A combo jack that takes XLR and 6.35 mm plugs is 6.35 mm audio, and the role names XLR. Optical is a TOSLINK digital audio socket.

AMarshall Emberton II

Connector	Count	Role
USB-C	1	Power input for charging

Source5Owner's manualassets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdfRead 23 October 2026Page 4 device layout: one USB-C power input. Data and charging standard versions are not stated.

BUltimate Ears BOOM 4

Connector	Count	Role
USB-C	1	Charging input

Source2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Speaker is charged via USB-C. Device input voltage/current not established by the separately listed adapter rating.

Controls and software

3 of 8 differ

SpeakerphoneiBuilt-in microphone and call support, through a connected phone or a voice assistant's calling. A microphone used only for voice commands does not count. Microphone inputs for karaoke are separate.

No1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: Microphone system No, voice command No.12Measurementsoundguys.com/marshall-emberton-ii-review-117005Read 23 October 2026Review: no built-in microphone for calls. Agrees with the maker spec table.16Reviewrtings.com/speaker/reviews/marshall/emberton-iiRead 23 October 2026Public header says Speakerphone: No and Voice Assistant: No. Locked numeric cells were not read.

No2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Voice assistantsiVoice assistants explicitly usable through the speaker, such as Amazon Alexa, Google Assistant, Siri or Sonos Voice Control. State whether a connected phone is required.

Not available

Not available

Controls

Bluetooth pairing button, Multidirectional control knob for power, play and pause, skip, fast forward, rewind and volume, Stack mode via Bluetooth button presses5Owner's manualassets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdfRead 23 October 2026Page 4: Bluetooth button, control knob (hold 2 s on or off, push once play or pause, push right or left skip, hold right or left fast forward or rewind, hold up or down volume). Page 7: triple press of the Bluetooth button starts or ends Stack mode. The 10-segment battery indicator is a status display.

Power, Bluetooth pairing, Volume up/down, Play/pause, Next/previous track, Magic Button playlist shortcut, Battery level2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Companion app

Marshall Bluetooth7Maker product pagemarshall.com/us/en/support/speakers/support-for-emberton-ii/how-to-use-the-appRead 23 October 2026The Marshall Bluetooth app controls the Emberton II.

UE | BOOM2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

App platforms

iOS, Android7Maker product pagemarshall.com/us/en/support/speakers/support-for-emberton-ii/how-to-use-the-appRead 23 October 2026Page links the Apple App Store and Google Play listings of Marshall Bluetooth.

iOS, Android2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

User firmware updates

Yes1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Page text: connect to the Marshall Bluetooth app for Over-the-Air (OTA) updates.5Owner's manualassets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdfRead 23 October 2026Page 9: the Marshall Bluetooth app updates the firmware.

Yes5Owner's manualsupport.logi.com/hc/en-us/articles/17139015562519-Getting-Started-UE-BOOM-4Read 10 October 2026Speaker Updates and Party Up instructions explicitly document OTA firmware updates from the UE | BOOM app.

Built-in lightingiDecorative or ambient lighting. Status, battery, connection and microphone indicator LEDs alone do not qualify.

Not available

No2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Indicator Lights lists four LEDs: power, Bluetooth, Magic button and one charging LED. No decorative lighting is listed.

Lighting modes

Not available

Not available

Smart home

None of 3 known

Matter controlleriCan add and control Matter devices. Being a Matter device alone does not count.

Not available

Not available

Thread border routeriConnects Thread smart home devices to the home network.

Not available

Not available

Zigbee hubiA built-in Zigbee radio that controls Zigbee smart home devices.

Not available

Not available

Battery and charging

5 of 17 differ

Built-in battery

Yes1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

Yes1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Playback time (claimed)iMaximum maker-claimed music playback on one charge in normal playback mode. Battery extension or reduced-bass boost modes belong in battery_life_boost_h. Record volume and lighting conditions in the source note.

30h1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Play time 30+ hours. Stored 30, the plus qualifier is here. No volume, EQ preset or codec is stated.

15h1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026Up to 15 hours. Varies with settings, volume and environmental conditions. High volume and bass boost reduce runtime.

Playback with battery extension (claimed)iTotal claimed runtime with the named battery extension mode enabled. Store the total, not only the extra hours. Keep sound and lighting restrictions in the source note.

Not available

Not available

Battery energyiPublished battery pack energy. Do not calculate from an assumed voltage.

Not available

11.52Wh2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Built-in Li-ion rechargeable battery 11.52 Wh. No pack voltage or mAh inferred.

Battery capacityiPublished pack capacity at the voltage in battery_voltage_v. Do not substitute power-bank output capacity. A figure written per cell, such as 5000mAh*2, is not a pack capacity unless the maker states the pack figure.

Not available

Not available

Nominal battery voltage

Not available

Not available

Battery chemistry

Lithium-ion1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: built-in, rechargeable Li-ion battery. Capacity is not published.5Owner's manualassets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdfRead 23 October 2026Page 6 battery care guide: high-performance lithium-ion battery.

Lithium-ion1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

User-replaceable batteryiBattery that the maker documents as replaceable by the user. Service replacement does not qualify.

Not available

No2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Battery user replaceable: Not recommended, improper assembly may affect waterproof performance. Maker does not document user replacement.

Full charge timeiTime from discharged to full under the maker conditions. Adapter rating and simultaneous use belong in source notes.

3h1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: charging time 3 hours. Adapter and use while charging are not stated.

3h2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Battery Charge Speed: less than 3 hours from empty to full with a Type C charger of 7.5 W or above. Stored as 3, the qualifier is here.

Quick charge duration

20min1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: 20 minutes charge gives 4 hours of playtime.

Not available

Playback after quick chargeiClaimed music playback after quick_charge_min of charging. Source conditions apply.

4h1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: 20 minutes charge gives 4 hours of playtime. Volume and starting charge are not stated.

Not available

Charging input ratingiPublished speaker input voltage and current. An adapter rating alone does not establish device input.

Not available

Not available

Max charging inputiPublished maximum charging input. USB audio power requirements and adapter output are separate.

Not available

Not available

USB Power Delivery charging

Not available

Not available

Charges other devices

Not available

Not available

Max power-bank outputiPublished power delivered by the speaker to another device. Output voltage and current belong in the source note.

Not available

Not available

Wireless chargingiThe speaker battery can be charged wirelessly. Wireless power output to another device is separate.

Not available

Not available

Durability

3 of 5 differ

Dust and water ratingiExact published IP rating. Keep separate ratings, such as IP68 and IP69, as separate entries.

IP671Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026IP67: immersion in 1 m of water for up to 30 minutes.

IP671Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Floats

Not available

Yes1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Drop resistanceiExplicit maker claim or defined drop test. Do not infer from rugged wording.

Not available

Yes1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Drop test heightiMaker-published tested height. Surface and conditions belong in source notes.

Not available

Not available

Carry featuresiPublished handles, straps, carabiners or wheels.

Not available

Bungee loop1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Measured

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Playback time (measured)iReviewer-measured playback per charge. Volume, lighting, sound mode, firmware and connection belong in the source note.

9.13h12Measurementsoundguys.com/marshall-emberton-ii-review-117005Read 23 October 2026SoundGuys standardized battery test: 9 h 8 min, stored as 9.13. Firmware 14.0.35, app 3.2.4. The review gives no test volume. SoundGuys' public method plays music peaking at 75 dB(SPL). Far below the maker claim of 30+ hours. Labo Fnac reports almost 17 h and Delamar reports 30+ hours at low to medium volume, so results depend on volume.

12h6Measurementrtings.com/speaker/reviews/ultimate-ears/boom-4Read 10 October 2026Public Outdoors verdict states 12 hours of battery life for the tested BOOM 4. Locked numeric tables were not read. Maker claim is 15 hours.7Measurementrtings.com/speaker/tests/active-features/batteryRead 10 October 2026Public method: latest firmware, full charge, audio track looped at 80 dB SPL from 1 m until the speaker runs out of charge. Speaker-specific sound mode, EQ and firmware are not published.

Max sound pressure (measured)iReviewer-measured maximum SPL. Distance, test method and power source belong in source notes.

87dB17Measurementleclaireur.fnac.com/test/120210-test-labo-de-la-marshall-emberton-iiRead 23 October 2026Labo Fnac test of 23 August 2022: output reaches 87 dB at 100 Hz, almost nothing at 60 Hz. The page gives no microphone distance or distortion limit. Labo Fnac's BOOM 3 test states 50 cm and 10 percent distortion. The value equals the maker's 87 dB SPL at 1 m claim, so check it.

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Low-frequency extension (measured)iReviewer-measured low-frequency limit. Threshold and test method belong in source notes.

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High-frequency extension (measured)iReviewer-measured high-frequency limit. Threshold and test method belong in source notes.

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Audio latency (measured)iReviewer-measured source-to-speaker latency. Source device, app, codec, firmware and connection belong in source notes. App compensation may affect results.

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Full charge time (measured)iReviewer-measured time from empty to full. Power adapter and method belong in the source note.

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Dimensions and weight

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DimensionsiSpeaker body width, height and depth on explicitly identified axes. Unlabeled tuples do not establish axis meanings. Handle, strap and orientation conditions belong in the source note.

Width160Height68Depth76mm(6.3 × 2.7 × 3 in)1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: width 160 mm, height 68 mm, depth 76 mm. Bare speaker in normal horizontal orientation. Marshall also lists inch figures.

Width73Height184Depth73mm(2.9 × 7.2 × 2.9 in)2Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026Product Dimensions table, Speaker row explicitly labels height 184, width 73, depth 73 mm. Packaging row excluded.

WeightiSpeaker mass including its battery. Excludes packaging, charger and removable carry accessories unless the source states otherwise.

700g(1.5 lb)1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Spec table: 0.7 kg / 1.5 lb, so 700 g. Maker figure is rounded. Labo Fnac weighed 674 g and SoundGuys 673 g.

620g(1.4 lb)1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Body materials

Silicone sleeve, Metal grille1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Page text: textured silicone sleeve and solid metal grille. Internal enclosure material is not stated.

Post-consumer recycled plastic, Recycled polyester fabric3Press releasenews.logitech.com/press-releases/news-details/2024/The-Rugged-Ultimate-Ears-EVERBOOM-Superior-Sound-That-Is-Waterproof-Dustproof-and-Floatable/default.aspxRead 8 October 2026BOOM 4 plastic components minimum 52% PCR by weight. Fabric is 100% PCR polyester. Packaging excluded.

Certifications

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FCC IDs

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Other certifications

EU Declaration of Conformity (2014/53/EU RED), RoHS (2011/65/EU)8Maker spec sheet (PDF)assets.ctfassets.net/javen7msabdh/3Ryqpv66DmmXRLwtonVyqL/e45e1a50c546892505f0aed538bf81d1/pdf_emberton_ii.pdfRead 23 October 2026EU Declaration of Conformity for EMBERTON II, English page 3, signed Stockholm 2022-01-12: Directive 2014/53/EU (RED) and 2011/65/EU (RoHS). Model-level EU claim only.

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In the box

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In the box

Emberton II speaker, USB-C charging cable, User manual with legal and safety information1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026Included in the box: Emberton II speaker, user manual with legal and safety information, USB-C charging cable.

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Links

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Product page

www.marshall.com/us/en/product/emberton-ii1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

www.ultimateears.com/en-us/shop/p/boom-41Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026

Spec sheet

www.marshall.com/us/en/product/emberton-ii1Maker product pagemarshall.com/us/en/product/emberton-iiRead 23 October 2026

support.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-42Maker product pagesupport.logi.com/hc/en-us/articles/17139015760279-Specification-BOOM-4Read 10 October 2026

Manual

assets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdf5Owner's manualassets.ctfassets.net/javen7msabdh/29CADFcziaeD0mjR7nOJ5M/ed8d92ba6d699bb42e000e674b6a131d/Marshall-Emberton-II-User-Manual_EN.pdfRead 23 October 2026Maker Full Online Manual in English, printed pages 3-9.

support.logi.com/hc/en-us/articles/17139015562519-Getting-Started-UE-BOOM-45Owner's manualsupport.logi.com/hc/en-us/articles/17139015562519-Getting-Started-UE-BOOM-4Read 10 October 2026Official getting-started manual explicitly covers BOOM 4 and MEGABOOM 4.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

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2years1Maker product pageultimateears.com/en-us/shop/p/boom-4Read 10 October 2026US page embedded specs and compatibility: 2-Year Limited Hardware Warranty.

Both are also in the API. Back to all wireless speakers.