Wireless speakers / Compare

Marshall Willen II vs soundcore Select 4 Go

A

Product A: Marshall

Willen II

45 of 96 known

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B

Product B: soundcore

Select 4 Go

43 of 96 known

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Every value links to where we found it.

Only differences

AMarshall Willen II

Bsoundcore Select 4 Go

General

6 of 8 differ

Series

Willen1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Marshall names the speaker Willen II, the second Willen generation.

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.

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

10067141Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Item number 1006714 is the pid of the Black and Brass selection on this page. The Cream colour has its own item number, which is not stored.

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.

GTIN / EAN

Not available

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.

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

19 August 20243Press articlewhathifi.com/news/rock-on-marshalls-third-gen-portable-speakers-are-here-to-rock-your-world-wherever-you-goRead 13 October 2026Article published 19 August 2024 announces the speaker.

Not available

Status

Available1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Maker sells the speaker with an Add to Bag button at USD 129.99 on the accessed date.

Available1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026US store shows six colors in stock on 2026-10-15.

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

Not available

Not available

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.

$1193Press articlewhathifi.com/news/rock-on-marshalls-third-gen-portable-speakers-are-here-to-rock-your-world-wherever-you-goRead 13 October 2026Launch price listed as USD 119 for the Willen II.

Not available

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.

€1193Press articlewhathifi.com/news/rock-on-marshalls-third-gen-portable-speakers-are-here-to-rock-your-world-wherever-you-goRead 13 October 2026Launch price listed as EUR 119. European prices include VAT.

Not available

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

US, EU3Press articlewhathifi.com/news/rock-on-marshalls-third-gen-portable-speakers-are-here-to-rock-your-world-wherever-you-goRead 13 October 2026Prices evidenced for the US and Europe. The article also gives GBP 99 and AUD 199.

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

ColoursiThe maker's own colour names

Black and Brass, Cream1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Colorways table lists Black and Brass and Cream.

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.

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/willen-iiRead 13 October 2026Maker calls it a portable speaker.

Portable1Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026Maker calls it a portable speaker for showers, camping, hiking and biking.

Audio

9 of 18 differ

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

Mono1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Stereo/mono row says Mono.

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.

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 Willen II

Driver type	Count	Diameter (mm)
Full-range driver	1	50.8

Source1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Audio specification says one 2 inch 10 W full range driver. The 2 inch size is converted exactly to 50.8 mm. The rating basis is not stated, so no per-driver rated power is stored.

Bsoundcore 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.

Passive radiatorsiPassive, unpowered bass radiators. Excludes powered drivers.

21Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Audio specification says 2 passive radiators.

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.

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.

10W1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026The 10 W figure belongs to the single full range driver and its rating basis is not stated. The page also lists a 38 W Class D amplifier, which is an amplifier rating and is not stored as audio 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.

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.

75Hz1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Frequency range 75 to 20,000 Hz. Tolerance is not stated. The 88 dB SPL at 1 m maker claim is not entered as a measurement.

Not available

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/willen-iiRead 13 October 2026Frequency range 75 to 20,000 Hz. Tolerance is not stated.

Not available

Signal-to-noise ratio (claimed)

Not available

Not available

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

No4Reviewdigit.in/reviews/audio-video/marshall-willen-ii-review-a-small-package-that-packs-a-punch.htmlRead 13 October 2026Review says the Marshall app has three presets and no custom EQ. Presets alone do not qualify as an adjustable equalizer.

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.

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, Voice4Reviewdigit.in/reviews/audio-video/marshall-willen-ii-review-a-small-package-that-packs-a-punch.htmlRead 13 October 2026Review names the app presets Marshall (default), Push and Voice.

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.

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

Not available

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.

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

Not available

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.

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

Not available

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.

Yes5Reviewtest-aankoop.be/hightech/draadloze-speakers/vergelijker/marshall-willen-ii/461/110300Read 13 October 2026

Yes7Maker product pageankerjapan.com/products/a31x1Read 15 October 2026

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

5.31Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Wireless connectivity row says Bluetooth 5.3 LE. The maker support page says Bluetooth 5.2. The product page spec table is used. Bluetooth LE Audio-ready wording is not a statement of current support, so LE Audio and Auracast are not stored.

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.

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

AAC5Reviewtest-aankoop.be/hightech/draadloze-speakers/vergelijker/marshall-willen-ii/461/110300Read 13 October 2026Comparison table lists AAC: Ja and aptX: Nee. SBC is not listed, so only AAC is stored. The maker states no codecs.

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

Bluetooth profiles

Not available

Not available

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.

Yes1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Product details row says Bluetooth multipoint connectivity: Yes.

Not available

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

22Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Pairing section says Willen II can be connected with 2 devices at a time and remembers up to 8 previously paired devices.

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/willen-iiRead 13 October 2026Bluetooth range row says up to 10 m in free field on every regional page opened. Several retailers and reviews say 100 m. The maker figure is used.

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.

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

Not available

Not available

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

Not available

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.

AMarshall Willen II

Connector	Count	Role
USB-C	1	Charging power input

Source2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Device layout shows one USB-C power input.

Bsoundcore 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.

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.

Yes1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Built-in microphone for hands-free calls.2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Device layout names a microphone that lets the speaker work as a speaker phone.

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.

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 button, Bluetooth pairing and call-routing button, Multi-directional control knob1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Top panel controls: multi-directional control knob, on/off button, Bluetooth pairing button and battery indication.2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Control knob: push once for play/pause and calls, left or right to skip, up or down for volume.

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.

Companion app

Marshall Bluetooth1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Compatible apps row names the Marshall Bluetooth 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.

App platforms

iOS, Android1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Compatible apps row says iOS and Android.

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

User firmware updates

Yes2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Troubleshooting says to connect the Marshall Bluetooth app and follow the in-app instructions to get the latest firmware.

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.

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

Not available

Not available

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

Yes1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Battery section gives play time and charging time for the 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.

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.

17h1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Play time 17+ hours. Stored 17 for the stated threshold with the plus qualifier. No volume or setting is stated.

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.

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

Not available

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

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.

Nominal battery voltage

Not available

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.

Battery chemistry

Lithium-ion2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Battery care guide says the speaker has lithium-ion batteries.

Not available

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

Not available

Not available

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

2.5h1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Charging time 2.5 hours. Charger rating is not stated on the page. The manual says 5 V, 1.5 A.

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.

Quick charge duration

20min1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Quick charging: 20 minutes of charge gives 5.5 hours of playtime.

Not available

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

5.5h1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Maker claim of 5.5 hours of playtime after 20 minutes of charging. 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.

5 V, 1.5 A2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Charging section says to use a USB power source of 5 V, 1.5 A.

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.

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

2 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/willen-iiRead 13 October 2026IP67 means submersion in 1 m of water for up to 30 minutes.

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.

Floats

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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.

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

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

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Carry featuresiPublished handles, straps, carabiners or wheels.

Fastening strap1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Rubber fastening strap for hanging or fixing the speaker.

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.

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.

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

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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.

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.

Width100.5Height100.5Depth43.4mm(4 × 4 × 1.7 in)1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Physical unit table labels width 100.5 mm, height 100.5 mm and depth 43.4 mm. Bare speaker.

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

360g(12.7 oz)1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Physical unit table, 0.36 kg converted exactly to 360 g.

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.

Body materials

Silicone sleeve2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Cleaning section says the silicone sleeve and carry strap can be removed.

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.

Certifications

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FCC IDs

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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.

Other certifications

Not available

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.

In the box

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In the box

Willen II speaker, USB-C charging cable, User manual and legal and safety information1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026Box contents: speaker, USB-C charging cable, user manual and legal and safety information.

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.

Links

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Product page

www.marshall.com/us/en/product/willen-ii1Maker product pagemarshall.com/us/en/product/willen-iiRead 13 October 2026

us.soundcore.com/products/a31x10211Maker product pageus.soundcore.com/products/a31x1021Read 15 October 2026

Spec sheet

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Manual

www.marshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdf2Owner's manualmarshall.com/on/demandware.static/-/Library-Sites-SharedLibrary-Marshall/default/dwe0dadd06/images/cms-pages/user/Marshall_Willen_II_OLM_R1_2_en.pdfRead 13 October 2026Maker English full online manual, revision 1.2, nine pages.

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.

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.

1year6Retailer pageamazon.com/dp/B0DD7T8H2QRead 13 October 2026Amazon US lists 1 Year Limited warranty. Market is the US.

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.

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