Wireless speakers / Compare

Bose SoundLink Flex Portable Speaker (2nd Gen) vs Marshall Emberton III

A

Product A: Bose

SoundLink Flex Portable Speaker (2nd Gen)

47 of 96 known

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B

Product B: Marshall

Emberton III

53 of 96 known

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All 96 fields

Every value links to where we found it.

Only differences

ABose SoundLink Flex Portable Speaker (2nd Gen)

BMarshall Emberton III

General

5 of 8 differ

Series

SoundLink1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Emberton1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

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

4425913Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Regulatory information, page 4: Model 442591.

10068841Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Exact currently sold US Black and Brass selection, pid and public Product JSON-LD SKU 1006884. Selected colour and InStock offer were read. Brown strap bundle, limited editions and other colour SKUs are excluded.12Retailer pagebhphotovideo.com/c/product/1840903-REG/marshall_1006884_emberton_iii_black_brass.htmlRead 8 October 2026

GTIN / EAN

Not available

734005540225512Retailer pagebhphotovideo.com/c/product/1840903-REG/marshall_1006884_emberton_iii_black_brass.htmlRead 8 October 2026Exact Black and Brass MFR 1006884 page explicitly lists EAN 7340055402255. This is the selected normal SKU, not Cream or Hendrix. Public web-rendered page was read. Its incorrect one-driver and 2 x 76 W technical cells are excluded, and no access challenge was bypassed.

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

Not available

19 August 20243Press releaselittleredrooster.co.uk/wp-content/uploads/2024/08/UK_Emberton-III-Willen-II-press-release.pdfRead 8 October 20264Press releasegroup.marshall.com/2024/08/19/marshall-unveils-new-portable-powerhouses-emberton-iii-and-willen-iiRead 8 October 2026

Status

Available1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Available1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

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

Bose SoundLink Flex Bluetooth Speaker5Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026SoundGuys calls the original Bose SoundLink Flex the predecessor of the SoundLink Flex (2nd Gen).

Marshall Emberton II13Reviewwhathifi.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.14Press articlet3.com/tech/bluetooth-speakers/marshall-emberton-3-reviewRead 23 October 2026T3's review calls the Emberton III the replacement for the Emberton II.

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

$1693Press releaselittleredrooster.co.uk/wp-content/uploads/2024/08/UK_Emberton-III-Willen-II-press-release.pdfRead 8 October 2026Page 3 Manufacturer Suggested Retail Price lists US 169 USD and EU 179 EUR. Stored literal whole-currency amounts preserve this primary launch document. Later current 179.99 USD price and differing review quotations are excluded. US tax treatment is not specified.

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

€1793Press releaselittleredrooster.co.uk/wp-content/uploads/2024/08/UK_Emberton-III-Willen-II-press-release.pdfRead 8 October 2026Page 3 original EU MSRP is 179 EUR. Exact normal launch model, not a limited edition or current sale price. VAT treatment is not expressly stated.

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

US1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

US1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

ColoursiThe maker's own colour names

Black, Blue Dusk, Sandstone, Alpine Sage, Twilight Blue, Petal Pink, Citrus Yellow, Fog Grey, Dewdrop Mint1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Current maker page explicitly offers Dewdrop Mint. Other listed colors come from the exact-model support specification.2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026

Black and Brass1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 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 pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Portable1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

Audio

10 of 18 differ

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

Mono1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Stereo1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Maker Stereo/mono table explicitly states Stereo for one physical speaker. True Stereophonic is the built-in multidirectional stereo playback feature, not proof of wireless left/right pairing.

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.

ABose SoundLink Flex Portable Speaker (2nd Gen)

Driver type	Count
Full-range	1

Source4Maker product pagesupport.bose.com/article/poor-sound-quality-from-product-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026Exact second-generation support article: one active speaker and two passive radiators. Full-range role is also stated in product-page sound options.

BMarshall Emberton III

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

Source5Retailer pagecrutchfield.com/p_972EMBT3BK/Marshall-Emberton-III-Black-and-Brass.htmlRead 8 October 2026Exact MFR 1006884 product highlights and narrative explicitly identify two 2-inch full-range powered drivers, each with its own Class D amplifier. Published nominal diameter 2 inches converts exactly to 50.8 mm. No continuous per-driver watts are established. Maker/PR amplifier figure two 38 W and 10 W driver labels have no continuous/RMS operating basis, so all rated/peak audio power fields remain unknown. B&H miscounts one powered driver and says 2 x 76 W, which are excluded.6Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-emberton-iii-bluetooth-speaker-reviewRead 8 October 2026Specs table explicitly lists two full-range drivers and two passive radiators. Its watt labels lack a continuous/RMS basis and are not stored as rated audio output.

Passive radiatorsiPassive, unpowered bass radiators. Excludes powered drivers.

24Maker product pagesupport.bose.com/article/poor-sound-quality-from-product-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026

21Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Two passive radiators. These are unpowered and excluded from the powered-driver table.

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.

Not available

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

65Hz1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Published 65 Hz to 20,000 Hz range. Tolerance and volume mode are not stated. The separate 90 dB SPL at 1 m maker claim is not a reviewer measurement and is not entered in measured_max_spl_db.

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

20kHz1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

Signal-to-noise ratio (claimed)

Not available

Not available

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

Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

No6Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-emberton-iii-bluetooth-speaker-reviewRead 8 October 2026Matching third-generation review states three fixed EQ presets and no EQ customization. Selecting fixed presets does not meet adjustable-band equalizer field meaning.7Reviewlesnumeriques.com/enceintes-portables/marshall-emberton-iii-p75413/test.htmlRead 8 October 20269Reviewtomsguide.com/audio/marshal-emberton-iii-reviewRead 8 October 2026Review states three fixed presets are the only sound personalization. Its approximately 31-hour mid-volume observation has looser conditions than the selected 80 dB / 1 m test and is not mixed into the stored runtime.

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

35Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026Bose app offers Bass, Middle and Treble sliders.

Not available

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

Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026PositionIQ senses speaker orientation and adjusts playback. Standing, lying and hanging orientations are supported.

Yes1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Dynamic Loudness automatically adjusts tonal balance as the listening volume changes. This is not spatial room calibration.

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

Not available

Marshall, Push, Voice7Reviewlesnumeriques.com/enceintes-portables/marshall-emberton-iii-p75413/test.htmlRead 8 October 2026Application section explicitly names Marshall, Push and Voice fixed modes. Tested firmware 9.1.7 and Marshall Bluetooth app 3.2.1.1 (250123.176). No user-adjustable band equalizer.

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

Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Two identical SoundLink Flex (2nd Gen) speakers provide left and right channels. Party Mode can link different compatible current SoundLink models.

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.

Bose Party Mode, Bose Stereo Mode, Bose SimpleSync1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Not available

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

21Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Two speakers in Party or Stereo Mode. SimpleSync connects to a compatible Bose smart speaker or soundbar.

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.

Yes3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026

Yes5Retailer pagecrutchfield.com/p_972EMBT3BK/Marshall-Emberton-III-Black-and-Brass.htmlRead 8 October 20267Reviewlesnumeriques.com/enceintes-portables/marshall-emberton-iii-p75413/test.htmlRead 8 October 2026

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

5.32Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026

5.31Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Maker explicitly publishes Bluetooth 5.3 LE. LE Audio-ready and future Auracast wording do not prove current activation. Current exact-model 9.2.6 firmware notes were checked and only identify security/Fast Pair changes, so LE Audio/Auracast activation and speaker-link limits remain unknown.

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

SBC, AAC, aptX Adaptive3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Page 18 explicitly identifies aptX Adaptive with a compatible Snapdragon Sound source. SBC and AAC are corroborated by the exact-model SoundGuys review.

SBC5Retailer pagecrutchfield.com/p_972EMBT3BK/Marshall-Emberton-III-Black-and-Brass.htmlRead 8 October 2026Current exact-model Specs panel opened in normal Chrome: SBC Yes, AAC No. SBC is independently supported by Les Numeriques and Android Central. Only confirmed SBC is stored. Codec inventory is incomplete: AAC is disputed by those two reviews, so AAC is neither stored as supported nor labelled unsupported. aptX/LDAC are not inferred from Bluetooth version.7Reviewlesnumeriques.com/enceintes-portables/marshall-emberton-iii-p75413/test.htmlRead 8 October 2026Public characteristics table lists SBC and AAC. SBC agrees with current exact Crutchfield table. AAC conflicts with that retailer No cell and is omitted pending direct maker evidence. LC3 is described as unavailable under this tested firmware and is not treated as current universally active support.

Bluetooth profiles

A2DP, AVRCP, BLE, HFP2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026

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 pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Yes2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026

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

21Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

22Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed page 7 explicitly states connected with 2 devices at a time and remembers up to 8 previously paired devices. Stored 2 counts concurrent Bluetooth source devices, not pairing memory or linked speakers.

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

Not available

100m1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Up to 100 m in free field. Published open-field claim, not a typical indoor operating distance or a measured range.

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

No6Reviewrtings.com/speaker/reviews/bose/soundlink-flex-2nd-genRead 8 October 2026Public Wi-Fi test row explicitly says No. Member-only metrics were not used.

No6Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-emberton-iii-bluetooth-speaker-reviewRead 8 October 2026Review describes Bluetooth as the only playback connection. No Wi-Fi or wired playback is offered.

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

No6Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-emberton-iii-bluetooth-speaker-reviewRead 8 October 2026Bluetooth-only music playback. USB-C is charging, not computer/phone USB audio input.

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

Not available

No6Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-emberton-iii-bluetooth-speaker-reviewRead 8 October 2026The review identifies no source route besides Bluetooth. USB-C charging is not USB storage-file playback.

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.

ABose SoundLink Flex Portable Speaker (2nd Gen)

Not available

BMarshall Emberton III

Connector	Count	Role
USB-C	1	Charging power input

Source2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed page 4 complete device layout identifies one USB-C power input. Printed page 5 charging instructions use the supplied USB-C lead and recommend a 5 V / 3 A USB source. Port data version and maximum device input watts are not stated.

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 pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Standard non-SE SoundLink Flex (2nd Gen). Maker specifications exclude the later SE variant from microphone support. No SE variant is included.

Yes2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed pages 4-5 explicitly describe the microphone for speakerphone calls. Bluetooth button routes a call between speaker and phone. Knob answers/ends and rejects calls.

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.

Siri, Google Assistant6Reviewrtings.com/speaker/reviews/bose/soundlink-flex-2nd-genRead 8 October 2026Public Voice Assistant verdict explicitly supports the paired phone Siri or Google Assistant. No independent assistant on the speaker.

Not available

Controls

Power, Bluetooth pairing, Volume up/down, Play/pause, Next/previous track, Programmable shortcut3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Speaker Controls pages 19-23. Shortcut choices include linking, Spotify Tap or connected-phone voice assistant.

Power button, Bluetooth pairing and call-routing button, Multidirectional playback, volume and call-control knob2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed page 4 power and Bluetooth buttons plus the multidirectional knob. Page 5: press once play/pause or answer/end, press twice reject call, left/right skip, up/down volume. Ten-segment battery indication is status, not another control.

Companion app

Bose app1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Marshall Bluetooth1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

App platforms

iOS, Android1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

iOS, Android1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

User firmware updates

Yes3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Care and Maintenance, Update the Speaker: Bose app OTA or Bose updater website.

Yes10Maker product pagemarshall.com/nl/en/support/speakers/support-for-emberton-iii/latest-firmware-versionRead 8 October 2026Exact-model current maker firmware page gives user app update instructions and versions 9.2.6/9.2.1/9.1.7. It does not publish an LE Audio/Auracast activation change, so no activation or broadcast count is inferred.

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

5 of 17 differ

Built-in battery

Yes3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026

Yes1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 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.

12h3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Page 25: up to 12 hours using Bluetooth A2DP at 50% volume, default EQ, Top 50 Global February 2024 tracks, 20-25 C. At maximum volume Bose specifies up to three hours.

32h1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Normal-playback maker claim is 32+ hours on one charge. Stored 32 preserves the stated numerical threshold with the plus qualifier here, not an exact maximum or guaranteed runtime at every volume. No volume, codec, EQ preset or battery-preservation setting is specified. No battery extension total is published.

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

Not available

Nominal battery voltage

Not available

Not available

Battery chemistry

Lithium-ion2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026

Lithium-ion2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed page 6 identifies lithium-ion batteries. Capacity, energy and nominal voltage are not stated and are not inferred.

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.

4h3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Page 25: up to four hours from 0 to 100% in standby, 5 V/1.5 A (7.5 W) USB-A supply.

2h1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Maker says full charge in 2 hours. Manual recommends a 5 V / 3 A USB power source. Charging while playing and battery-preservation settings are not specified. A recommended adapter rating is not substituted for a separately published speaker input ceiling.

Quick charge duration

Not available

20min1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Maker claim: 20 minutes of charging gives 6 hours of playtime. Volume, EQ preset, codec and initial state of charge are not stated.

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

Not available

6h1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

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

5 V DC, 1.5 A3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026Regulatory information, page 4: Input Rating 5 V DC, 1.5 A. This is device input, separate from adapter output.

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

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USB Power Delivery charging

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Charges other devices

No1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Maker comparison table: Charging Out No.

No5Retailer pagecrutchfield.com/p_972EMBT3BK/Marshall-Emberton-III-Black-and-Brass.htmlRead 8 October 2026Exact-model Power and Battery Info table explicitly says Charges External Device Via USB No. This excludes charging another device, separately from charging the speaker itself.8Reviewcomputerbild.de/artikel/avf-Tests-Audio-Marshall-Emberton-3-im-Test-Anders-und-doch-gleich-39229485.htmlRead 8 October 2026Public test conclusion explicitly identifies absence of a power-bank function and any music source besides Bluetooth. This corroborates the exact retailer table.

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

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

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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 pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

IP671Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026IP67 dust and waterproof claim: immersion at 1 m for up to 30 minutes. Does not establish floating or a defined drop-test height.

Floats

Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

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

Yes1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

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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.

Nylon utility loop1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Strap anchor2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed page 4 strap anchor is a fastening point for an optional carry strap or charm. No strap is included with this Black and Brass SKU.

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.

7.05h5Reviewsoundguys.com/bose-soundlink-flex-2nd-gen-review-125253Read 8 October 2026Exact SoundLink Flex (2nd Gen) review: 7 h 3 min. Looping music at 80 dB from one meter. Firmware 4.3.30, Bose app 10.3.13. Volume is higher than the maker 50% runtime test.

25.5h8Reviewcomputerbild.de/artikel/avf-Tests-Audio-Marshall-Emberton-3-im-Test-Anders-und-doch-gleich-39229485.htmlRead 8 October 2026December 8, 2024 original Emberton III battery test reports approximately 25.5 hours at average 80 dB sound pressure measured from 1 m. Stored literal 25.5 retains the review approximation, not an exact guaranteed result. Connection was Bluetooth, the available playback route. Source device, codec, EQ preset, firmware version, battery-preservation state, audio programme and status-light state are not published. Higher test level than the unqualified maker 32+ claim can shorten runtime, but no maker test volume is invented.

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

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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.

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Width160Height68Depth76.9mm(6.3 × 2.7 × 3 in)1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Maker explicitly labels width 160 mm, height 68 mm and depth 76.9 mm. Bare speaker body in normal horizontal orientation, no optional strap. Millimetre cells take precedence over rounded inch figures.

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

590g(1.3 lb)7Maker product pagebose.de/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026Technical specifications: complete product system 0.59 kg. Convert published metric value to grams. H/D axes are conflicting between US product sections and are omitted.

670g(1.5 lb)1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Published speaker weight 0.67 kg converted exactly to 670 g. Built-in battery included, packaging, charger and optional strap excluded.

Body materials

Aluminum, Fabric, Nylon, Plastic, Silicone, Steel1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Silicone sleeve, Metal grilles2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Printed page 6 identifies a removable silicone sleeve. Metal grille material is separately supported by the matching hands-on review. The internal enclosure resin and recycled-content percentages are not guessed.9Reviewtomsguide.com/audio/marshal-emberton-iii-reviewRead 8 October 2026Matching Black and Brass third-generation hands-on review explicitly describes metal grilles and rubberized exterior. Maker manual specifically identifies the external sleeve as silicone. No internal chassis alloy is inferred.

Certifications

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FCC IDs

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Other certifications

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EU Declaration of Conformity (2014/53/EU RED), RoHS (2011/65/EU)11Maker spec sheet (PDF)assets.ctfassets.net/javen7msabdh/2SE8n9eDLitcnYFpyLp9pZ/3c162fcc01bf55d44a326f985152fe5f/Declaration_Of_Conformity_-_EMBERTON_III.pdfRead 8 October 2026Maker exact EMBERTON III EU declaration, English printed page 3, signed January 29, 2024: RED 2014/53/EU and RoHS 2011/65/EU. Model-level EU conformity claim only. No US FCC identifier, battery certificate number or test-score equivalence is inferred.

In the box

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In the box

SoundLink Flex Portable Speaker (2nd Gen), USB-C to USB-A cable, Safety sheet1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

Emberton III speaker, USB-C charging cable, User manual and legal and safety information1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026Complete selected Black and Brass box list: speaker, USB-C charging cable, user manual/legal/safety information. A strap is supplied only with Brown, which is not this reference. No USB power adapter is listed.

Links

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Product page

www.bose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.html1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026

www.marshall.com/us/en/product/emberton-iii1Maker product pagemarshall.com/us/en/product/emberton-iiiRead 8 October 2026

Spec sheet

support.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-gen2Maker product pagesupport.bose.com/s/article/product-specifications-bose-soundlink-flex-portable-speaker-2nd-genRead 8 October 2026Exact second-generation manufacturer support specification page. SE microphone exception explicitly identified. Non-SE reference model.

littleredrooster.co.uk/wp-content/uploads/2024/08/UK_Emberton-III-Willen-II-press-release.pdf3Press releaselittleredrooster.co.uk/wp-content/uploads/2024/08/UK_Emberton-III-Willen-II-press-release.pdfRead 8 October 2026Original Marshall-branded four-page August 19, 2024 launch/technical information PDF hosted by its PR agency. This is maker-issued material, not an independently designed retailer datasheet.

Manual

assets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdf3Owner's manualassets.bosecreative.com/m/409c7c0457a61e44/original/891014_OG_SLFLXII-SPEAKERWIRELESS_en.pdfRead 8 October 2026

assets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdf2Owner's manualassets.ctfassets.net/javen7msabdh/6vPR2v4hd20NkzrsUHx3wX/03f42d56f70763024d6d65a4f36f3bcb/Marshall_Emberton-III_OLM_R1_1_en.pdfRead 8 October 2026Maker English Full Online Manual R1.1, 10 PDF pages, linked from the exact product page. Printed pages 3-7 cover complete layout, charging, controls, battery chemistry and concurrent source connections.

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.

1year1Maker product pagebose.com/p/speakers/bose-soundlink-flex-portable-speaker-2nd-gen/SLFLXII-SPEAKERWIRELESS.htmlRead 8 October 2026US maker page: included one-year Bose limited warranty. BoseCare paid extensions are excluded.

1year5Retailer pagecrutchfield.com/p_972EMBT3BK/Marshall-Emberton-III-Black-and-Brass.htmlRead 8 October 2026Exact currently sold US MFR 1006884 product highlights list warranty 1 year. US source-market warranty only, not a universal regional claim. B&H exact SKU independently corroborates the one-year manufacturer warranty.12Retailer pagebhphotovideo.com/c/product/1840903-REG/marshall_1006884_emberton_iii_black_brass.htmlRead 8 October 2026Exact US Black and Brass SKU items include Limited 1-Year Manufacturer Warranty. Scoped to the US source offer, not every regional statutory right.

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