Wireless speakers / Compare

soundcore Select 4 Go vs Ultimate Ears BOOM 4

A

Product A: soundcore

Select 4 Go

43 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

Asoundcore Select 4 Go

BUltimate Ears BOOM 4

General

4 of 8 differ

Series

Select1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Maker names the Select line. The Select 4 Go is the entry model of that line.

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.

A31X1, A31X1012, A31X1022, A31X1032, A31X1062, A31X1092, A31X10Q22Maker product pageus.soundcore.com/products/a31x1021.jsRead 15 October 2026Public store feed lists SKUs A31X1012, A31X1022, A31X1032, A31X1062, A31X1092 and A31X10Q2. A31X1 is the model on the EU declaration. Two-pack bundle SKUs are excluded. The store text says the latest version, so these SKUs are treated as the Bluetooth 6.0 revision. Old-revision SKUs such as A31X1011 and A31X1021 are left out because the Bluetooth version differs and is not a per-variant field.10Maker spec sheet (PDF)salesforce-knowledge-download.s3.us-west-2.amazonaws.com/000021297/en_US/000021297.pdfRead 15 October 2026EU and UK Declaration of Conformity for model A31X1, version V1.0, dated July 2025.

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

GTIN / EAN

194644207533, 194644207694, 194644207632, 194644207649, 194644207656, 1946442149752Maker product pageus.soundcore.com/products/a31x1021.jsRead 15 October 2026Barcodes of the six single-speaker SKUs. Two-pack bundles have no barcode.

Not available

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

Not available

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 pageus.soundcore.com/products/a31x1021Read 15 October 2026US store shows six colors in stock on 2026-10-15.

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.

Not available

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.

Not available

$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.

Not available

Not available

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

US2Maker product pageus.soundcore.com/products/a31x1021.jsRead 15 October 2026US store.

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

ColoursiThe maker's own colour names

Midnight Black, Pearl White, Pearl Blue, Minty Green, Cream White, Purple2Maker product pageus.soundcore.com/products/a31x1021.jsRead 15 October 2026Color options Midnight Black, Pearl Blue, Minty Green, Cream White, Purple and Pearl White.

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 pageus.soundcore.com/products/a31x1021Read 15 October 2026Maker calls it a portable speaker for showers, camping, hiking and biking.

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

Audio

10 of 18 differ

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

Mono4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026A single Select 4 Go does not support stereo sound.11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026Mono speaker with one full-range driver and one passive radiator.

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.

Asoundcore Select 4 Go

Driver type	Count
Full-range driver	1

Source4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026One 5W full-range speaker. The driver size is not stored because the guide table lists 1.75 without a unit.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026One 5W full-range speaker.

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.

14Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026One passive radiator.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026One passive radiator.

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.

5W1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Page says 5W output. No continuous, RMS or peak basis is stated.3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Audio Output Power 5W.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Output is 5W.

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.

Not available

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.

Not available

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.

Yes5Maker product pageservice.soundcore.com/article-description/How-do-I-get-the-best-sound-performance-from-my-Select-4-GoRead 15 October 2026Tells users to change EQ presets or customize the EQ in the soundcore app. The number of custom bands for this revision is not published by the maker.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026Page advertises a Pro equalizer with finer frequency bands to customize.11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026Reviewer used a customizable 9-band EQ on firmware 3.4.0, the Bluetooth 5.4 revision. The band count of the current revision is not confirmed, so it is not stored.

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.

soundcore Signature, Balanced, Treble Boost, Bass Boost3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026The app offers four EQ presets soundcore Signature, Balanced, Treble Boost and Bass Boost.

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.

Yes1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Page describes TWS pairing for stereo separation. It also says the latest version cannot be TWS-paired with older versions.3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Two identical speakers pair as left and right channels. The current device cannot be TWS paired with previous batches, which are identified by the 7th SN digit.

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.

True Wireless Stereo (TWS)1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026TWS for two speakers.3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026TWS mode only.

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

7 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.

Yes7Maker product pageankerjapan.com/products/a31x1Read 15 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.

6.03Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Bluetooth Version 6.0.6Maker product pageservice.soundcore.com/article-description/What-features-have-been-upgraded-in-the-new-version-of-Select-4-GoRead 15 October 2026New version uses Bluetooth 6.0. The old version is Bluetooth 5.4 and the maker lists no other hardware change.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026Japan page says Bluetooth 6.0.

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.

SBC, AAC7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026Supported codecs SBC and AAC.

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.

30m3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Bluetooth Range 30m / 98 ft.

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.

Not available

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.

Not available

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.

Not available

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.

Asoundcore Select 4 Go

Connector	Count	Role
USB-C	1	Charging input

Source3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026One USB-C charging port. The guide shows no other connector. No power-bank output is documented.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026FAQ says the speaker does not support Aux mode.

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.

No4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026No built-in microphone and no phone calls.11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026No built-in microphone.

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

Power, Bluetooth pairing, TWS pairing, Volume up/down, Play/pause, Next/previous track, Factory reset3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Button table. Reset is Bluetooth plus Volume Up held for at least 8 seconds. Volume buttons adjust volume.9Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000021296/en_US/000021296.pdfRead 15 October 2026Button controls match the current guide.

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

soundcore3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026soundcore app with EQ presets, auto power-off time and voice prompt settings.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Works with the soundcore app.

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

App platforms

iOS, Android4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026App is available for iOS and Android.

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

User firmware updates

Yes3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Firmware update prompt appears when the speaker connects to the app.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Firmware is updated from the soundcore app.

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

8 of 17 differ

Built-in battery

Yes3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table lists battery capacity. The speaker charges through USB-C.

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.

20h1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Page says up to 20 hours on a single charge. The FAQ gives 40% volume in Balanced EQ mode.3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says up to 20H, varies by volume level and music content.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Up to 20 hours at 40% volume in Balanced EQ mode. Varies with content, custom EQs and volume.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026Up to 20 hours. Varies with volume and source.

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.

2,400mAh3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Battery Capacity 2400mAh/3.65V.

Not available

Nominal battery voltage

3.65V3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Published together with the capacity. Wh is not published.

Not available

Battery chemistry

Not available

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.

4h3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Charging Time 4H. FAQ says around 4 hours with a certified 5V/1.5A charger.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Around 4 hours with a certified 5V/1.5A wall charger.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026About 4 hours.

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

Not available

Not available

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

Not available

Not available

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

5 V DC, 1.5 A3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Power Input 5V 1.5A. The adapter data in the guide is for the optional Anker A2337 and is not the speaker input.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Names a certified 5V/1.5A wall charger.

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

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

IP671Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Page says IP67 protection and immersion up to 3.3 ft deep for 30 minutes.3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026Specifications table says Waterproof Level IP67.4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026FAQ writes IPX67 and tells users to seal the waterproof cover. The guide and store page say IP67.7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026IP67.

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

Floats

Yes1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Page says the speaker can even float.11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026Reviewer says it is dustproof, waterproof and floats.

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.

Loop strap1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Page mentions the included strap.11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026Loop attachment to clip to a backpack.12Spec databaseifixit.com/Device/Anker_Soundcore_Select_4_GoRead 15 October 2026Loop strap for hanging or clipping to a bag.

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.

Not available

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.

86.8dB13Reviewouteraudio.comRead 15 October 2026Reviewer volume test reliably reached 86.8 dB at 1 m. Test music, weighting and power source are not stated. The unit was the Bluetooth 5.4 revision reviewed in 2024. The maker says the new revision differs only in the Bluetooth chip.

Not available

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

Not available

Not available

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

Not available

Not available

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.

Not available

Not available

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

Not available

Not available

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.

Not available

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.

265g(9.3 oz)7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026Japan page says about 265 g. Strap inclusion is not stated.11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026Review header lists 263 g. The maker figure of about 265 g is stored.

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

Body materials

Fabric, Rubber11Reviewsoundguys.com/soundcore-select-4-go-review-is-this-the-best-budget-speaker-under-40-137094Read 15 October 2026Enclosure wrapped in durable fabric with a rubberized control strip and rubber feet.12Spec databaseifixit.com/Device/Anker_Soundcore_Select_4_GoRead 15 October 2026Fabric-wrapped body with a rubberized control strip and rubber feet.

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

2AOKB-A31X19Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000021296/en_US/000021296.pdfRead 15 October 2026Quick Start Guide A31X1 (2024 print) lists FCC ID 2AOKB-A31X1. The guide of the Bluetooth 6.0 revision does not print the ID, so the ID is assumed to be unchanged.

Not available

Other certifications

EU Declaration of Conformity (Radio Equipment Directive 2014/53/EU)10Maker spec sheet (PDF)salesforce-knowledge-download.s3.us-west-2.amazonaws.com/000021297/en_US/000021297.pdfRead 15 October 2026Declaration to Directive 2014/53/EU and 2011/65/EU.

Not available

In the box

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In the box

Select 4 Go speaker, 30 cm USB-A to USB-C cable, Quick Start Guide4Maker product pageservice.soundcore.com/article-description/Soundcore-Select-4-Go-FAQRead 15 October 2026Speaker, 30cm A-C cable and Quick Start Guide. Wall charger not included.

Not available

Links

Not compared

Product page

us.soundcore.com/products/a31x10211Maker product pageus.soundcore.com/products/a31x1021Read 15 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

Not available

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

salesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdf3Owner's manualsalesforce-knowledge-download.s3.us-west-2.amazonaws.com/000029047/en_US/000029047.pdfRead 15 October 2026English user guide A31X1 dated 2026-05-15 on the Soundcore support page. It is the Bluetooth 6.0 revision. The 2024 manual says Bluetooth 5.4.

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.

Not available

Not available

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.

1.5years8Maker product pageus.soundcore.com/pages/warrantyRead 15 October 2026US warranty table lists speakers, all series, 18 months from purchase. The multi-language quick start guide shows a 24-month figure that includes 6 extra months after member registration in Japan. US statutory rights are excluded.

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.