Wireless speakers / Compare

Marshall Stanmore IV vs Sonos Era 300

A

Product A: Marshall

Stanmore IV

42 of 96 known

Change Marshall Stanmore IV

Compare the Sonos Era 300 with

Search wireless speakers

B

Product B: Sonos

Era 300

38 of 96 known

Change Sonos Era 300

Compare the Marshall Stanmore IV with

Search wireless speakers

All 96 fields

Every value links to where we found it.

Only differences

AMarshall Stanmore IV

BSonos Era 300

General

5 of 8 differ

Series

Not available

Not available

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

1009791, 1009793, 1009296, 1009298, 1009853, 10098541Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Colour selector product ids 1009791 Black and 1009793 Cream, read from the page data. The German store lists 1009296 Black, 1009298 Cream, and also 1009853 Black and 1009854 Cream. John Lewis sells 1009853. Which ids differ by plug or region is not stated.2Maker product pagemarshall.com/de/de/product/stanmore-ivRead 14 October 2026German store page data lists variants STANMORE IV BLACK 1009296 and 1009853, STANMORE IV CREAM 1009298 and 1009854, all priced at EUR 399.11Retailer pagejohnlewis.com/marshall-stanmore-iv-bluetooth-speaker/black/p115377417Read 14 October 2026UK retailer lists manufacturer part number 1009853 for the Black model.

E30G1US1BLK, E30G1US1, S411Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Store page data: SKU E30G1US1BLK Black and E30G1US1 White. S41 is the regulatory model number in the Sonos EU declaration of conformity.5Regulatory filingsonos.com/pdfs/conformity/era-300-it.pdfRead 15 October 2026EU declaration of conformity dated 7 March 2023: product ERA 300, model number S41.

GTIN / EAN

7340055423571, 73400554236181Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026EAN in the US page data: 1009791 is 7340055423571 and 1009793 is 7340055423618. EANs of the other ids were not found.

840136805595, 8401368055881Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026GTIN-13 in the store page data: 840136805595 for E30G1US1BLK Black and 840136805588 for E30G1US1 White.

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

7 July 20265Press releasegroup.marshall.com/2026/07/07/marshall-unveils-next-generation-acton-iv-and-stanmore-iv-speakers-for-the-homeRead 14 October 2026Launch release dated 7 July 2026.6Press articlesoundguys.com/marshall-acton-iv-and-stanmore-iv-launch-159646Read 14 October 2026Published 2026-07-07, 8:00 AM ET.

7 March 20234Press releaseen.community.sonos.com/product-updates/introducing-era-300-6880781Read 15 October 2026Sonos staff post of March 7, 2023: Era 300 pre-order today, global availability from March 28, 2023.

Status

Available1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Listed on the maker store. The US store showed Sold Out with a Notify Me button on 2026-10-14. The German store and John Lewis take orders.2Maker product pagemarshall.com/de/de/product/stanmore-ivRead 14 October 2026Orderable on the German store.

Available1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Offered for sale on the maker store in October 2026 with an Add to cart button.

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.

$399.996Press articlesoundguys.com/marshall-acton-iv-and-stanmore-iv-launch-159646Read 14 October 2026Launch article of 2026-07-07: Stanmore IV USD 399.99. TechRadar gives USD 399.99 and Tom's Guide USD 399. The US store later shows USD 429.99 and MusicTech reports that figure, so the store price changed or one outlet differs. The launch price is stored. Tax is not included in US list prices.8Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Price and release date: USD 399.99 / GBP 349.99 / AU$679, first released July 2026.

$4493Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/era-300/era300factsheet.pdfRead 15 October 2026USD $449 / GBP 449 / EUR 499 / AUD $749. Prices exclude US sales tax.4Press releaseen.community.sonos.com/product-updates/introducing-era-300-6880781Read 15 October 2026$449 USD.11Reviewwhathifi.com/reviews/sonos-era-300Read 15 October 2026Review: tested at 449 GBP / $449 / AU$749.

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.

€3997Press articlehifi.blog/marshall-acton-iv-and-stanmore-iv-more-room-more-bass-more-marshallRead 14 October 2026Article of 2026-07-08 lists Stanmore IV at EUR 399. Stereonet of 2026-07-09 also gives EUR 399. The German maker store shows EUR 399 including VAT.

€4993Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/era-300/era300factsheet.pdfRead 15 October 2026EUR 499 launch price, tax as published for the EU.4Press releaseen.community.sonos.com/product-updates/introducing-era-300-6880781Read 15 October 2026449 GBP, 499 EUR and 749 AUD alongside the USD price.

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

US, DE, FR, GB1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026US store page with USD price.2Maker product pagemarshall.com/de/de/product/stanmore-ivRead 14 October 2026German store sells it and shows an add to cart button.11Retailer pagejohnlewis.com/marshall-stanmore-iv-bluetooth-speaker/black/p115377417Read 14 October 2026Sold in the UK at GBP 349.99.12Retailer pageldlc.com/en/product/PB00747537.htmlRead 14 October 2026Sold in France at EUR 399.95 for Black.

US3Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/era-300/era300factsheet.pdfRead 15 October 2026Available from March 28, 2023 in the United States and many other countries. The stored market is the US, which matches the USD launch price.

ColoursiThe maker's own colour names

Black, Cream1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Colorways: Black, Cream.

Black, White1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Tech specs: Black, White. Finish matte.

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.

Home1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Page: Bluetooth home speaker.

Home1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Sonos sells Era 300 as a mains-powered home speaker with Wi-Fi and Bluetooth. It is not a portable speaker.

Audio

8 of 18 differ

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

Stereo1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Stereo/mono: Stereo. Sound channels of one speaker.

Other3Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/era-300/era300factsheet.pdfRead 15 October 2026Factsheet: six drivers direct sound left, right, forward and upward, and Era 300 is a multi-channel device for Dolby Atmos Music. It also plays a stereo soundstage. The enum has no spatial option, so other is stored. RTINGS calls it a stereo speaker.

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 Stanmore IV

Driver type	Count	Diameter (mm)
Woofer	1	127
Tweeter	2	19.05

Source1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026One 5 inch woofer and two 0.75 inch tweeters with waveguides. Converted exactly to 127 mm and 19.05 mm. The page lists amplifier ratings only, so no per-driver power is stored. Bass-reflex cabinet, so no passive radiator.

BSonos Era 300

Driver type	Count
Forward-firing tweeter	1
Side-firing tweeter	2
Upward-firing tweeter (horn-loaded)	1
Woofer	2

Source1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Tech specs: four tweeters (one forward-firing mid tweeter, two side-firing mid tweeters and one upward-firing tweeter loaded into a directional horn) and two woofers angled left and right. Six Class-D amplifiers drive them. Driver sizes and power are not published by the maker.

Passive radiatorsiPassive, unpowered bass radiators. Excludes powered drivers.

Not available

Not available

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.

110W9Reviewheadphonecheck.com/test/marshall-stanmore-ivRead 14 October 2026Review: three Class D amplifiers, 60 W for the woofer and 2 x 25 W for the tweeters, 110 W in total. The maker lists only the amplifier ratings, with no continuous, RMS or peak basis, so the total goes in the unspecified-rating field. The review also prints 2.99 kg for the weight, which conflicts with the maker's 3.99 kg and is not used.

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.

36Hz1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Frequency range 36-38,000 Hz. Tolerance and mode are not stated. HeadphoneCheck prints 37 Hz, which is not used.

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.

38kHz1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Frequency range 36-38,000 Hz. Tolerance and mode are 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.

Yes8Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-stanmore-iv-reviewRead 14 October 2026The Marshall app saves three EQ calibrations using a five-band equalizer. The M button cycles them.9Reviewheadphonecheck.com/test/marshall-stanmore-ivRead 14 October 2026App: five presets plus a 5-band EQ with three memory slots.

Yes1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Adjustable EQ: use the Sonos app to adjust bass, treble and loudness.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications: adjustable EQ for bass, treble and loudness in the Sonos app.

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

58Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Five-band equalizer in the Marshall app.9Reviewheadphonecheck.com/test/marshall-stanmore-ivRead 14 October 20265-band EQ.

21Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Bass and treble are two adjustable bands. Loudness is a switch and is not counted as a band.

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

Yes8Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-stanmore-iv-reviewRead 14 October 2026The app has placement compensation, which optimizes the audio output for the speaker's position. The maker page calls it room calibration. Dynamic Loudness is a separate loudness balance feature.

Yes1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Trueplay software measures the acoustics of the room and fine-tunes the EQ. Quick tuning uses the microphones in the speaker. Advanced tuning needs an iOS device. The microphone switch must be on.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Trueplay measures how sound reflects off walls and furnishings and tunes the speaker. Quick tuning uses the product microphones.

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

Not available

Not available

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

Not available

Yes1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Page: pair identical speakers for richer stereo sound.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications: stereo pair turns two speakers into separate left and right channel speakers. The pair must be the same speaker type.

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

Auracast1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Multi-speaker connectivity through Auracast broadcasts. Marshall Heddon, sold separately, is the broadcaster for older Marshall speakers and for Stanmore IV.10Reviewtomsguide.com/audio/smart-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Auracast-enabled and connects to its Homeline IV sibling. Multi-speaker connectivity is listed as unlimited with the Heddon hub. No numeric maximum is stored.

Sonos Wi-Fi grouping1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Controls and page copy let you group or ungroup Sonos products. Grouping runs over Wi-Fi in the Sonos system. No maximum group size is published for this speaker.

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

10 of 16 differ

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

Yes1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026

Yes10Press articlewhathifi.com/news/sonos-era-300-and-era-100-speakers-are-officialRead 15 October 202611Reviewwhathifi.com/reviews/sonos-era-300Read 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/stanmore-ivRead 14 October 2026Wireless connectivity: Bluetooth 5.3.

5.31Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Tech specs: Bluetooth 5.3 supports audio streaming from any Bluetooth-enabled device. The EU test summary and the user guide also say 5.3. The 2023 launch factsheet and What Hi-Fi say 5.0.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications: Bluetooth 5.3.6Regulatory filingsonos.com/pdfs/policies/sonos-eu-2023-826-era300-test-report.pdfRead 15 October 2026EU energy-related product test summary for model S41: performance specification Wi-Fi 802.11a/b/g/n/ac/ax, Bluetooth 5.3.

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

SBC, AAC, LDAC, LC31Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Codecs: SBC, AAC (MPEG-2), LDAC, LC3. Receive codecs.

SBC, AAC10Press articlewhathifi.com/news/sonos-era-300-and-era-100-speakers-are-officialRead 15 October 2026Launch coverage: Bluetooth with the standard SBC and AAC codecs. The same article writes Bluetooth 5.0, which conflicts with the current maker pages, so the version comes from the maker.11Reviewwhathifi.com/reviews/sonos-era-300Read 15 October 2026Review spec summary: Bluetooth 5.0 (SBC, AAC). The version differs from the maker pages and is not stored from here.

Bluetooth profiles

Not available

Not available

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

Yes3Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026The factory reset steps name a second Bluetooth entry, STANMORE IV [LE], which is the LE Audio device. HeadphoneCheck and Notebookcheck also state LE Audio support.9Reviewheadphonecheck.com/test/marshall-stanmore-ivRead 14 October 2026Review: Bluetooth 5.3 with LE Audio and Auracast support.

Not available

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

Yes1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Wireless connectivity lists Auracast. FAQ: Stanmore IV is an Auracast receiver and joins a broadcast from a Marshall broadcaster such as Heddon, or from phones with the Listen to Broadcast feature in the Marshall app. It does not state a broadcaster role.4Maker product pagemarshall.com/us/en/support/speakers/support-for-stanmore-ivRead 14 October 2026Stanmore IV is an Auracast receiver and can be added to a multi-speaker setup using a Marshall broadcaster such as Heddon.

Not available

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

Yes1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Bluetooth Multipoint Connectivity: Yes.

Not available

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

23Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026Pairing with a Bluetooth device: can connect to 2 Bluetooth 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/stanmore-ivRead 14 October 2026Bluetooth range 10 m / 32.8 ft.

Not available

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

No8Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Review states the speaker has no Wi-Fi connectivity.10Reviewtomsguide.com/audio/smart-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Review: Stanmore IV has no Wi-Fi streaming and no voice assistant support.12Retailer pageldlc.com/en/product/PB00747537.htmlRead 14 October 2026Retailer spec: Wi-Fi No. It also lists width 350, height 188 and depth 203 mm, which conflicts with the maker's 350 x 203 x 185 mm and is not used.

Yes1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Tech specs: compatible with WiFi 6, any 802.11a/b/g/n/ac/ax 2.4 GHz and 5 GHz router.

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

802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Tech specs list 802.11a/b/g/n/ac/ax.6Regulatory filingsonos.com/pdfs/policies/sonos-eu-2023-826-era300-test-report.pdfRead 15 October 2026Same test summary lists Wi-Fi 802.11a/b/g/n/ac/ax.

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

AirPlay 21Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Works with AirPlay 2 on Apple devices with iOS 11.4 and higher. Sonos app streaming is separate.

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 Stanmore IV

Connector	Count	Role
3.5 mm audio	1	AUX audio input on the top panel
RCA	1	Stereo RCA audio input pair on the bottom panel, preamp required for turntables
AC power	1	Mains power input, 100 to 240 V

Source1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Wired connectivity AUX 3.5 mm and RCA. Mains input voltage 100-240 V. Port positions and roles are from the manual.3Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026Top panel AUX 3.5 mm audio input. Bottom panel stereo RCA inputs, with an RIAA preamp for turntables, and the mains power input.

BSonos Era 300

Connector	Count	Role
USB-C	1	Line-in with the Sonos Line-In Adapter or Ethernet with the Sonos Combo Adapter, both sold separately. Not a power port
AC power	1	Mains power input

Source1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Tech specs: one USB-C port for the Sonos Line-In Adapter or the Sonos Combo Adapter for Ethernet, both sold separately. 100-240V 50/60Hz internal power supply with a 6 ft (2 m) power cable. The user guide says the USB-C port is not a power source for the speaker and must not charge other devices.

Controls and software

3 of 8 differ

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

No1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Microphone system: No.

No1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026No phone call feature is listed. The microphone array serves voice control and Trueplay.12Reviewrtings.com/speaker/reviews/sonos/era-300Read 15 October 2026Public headline row: Speakerphone No.

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

Sonos Voice Control, Amazon Alexa1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Works with Sonos Voice Control and Amazon Alexa. Availability varies by language and country. Siri control runs on an Apple device through AirPlay and the Home app and is not built in.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications: integrated voice control. Voice services section names Sonos Voice Control and Amazon Alexa.

Controls

Bass knob, Treble knob, Volume knob, Power switch, Media jog for play, pause and track change over Bluetooth, Customisable M-button, Source button1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Top panel controls: bass, treble, volume, power switch, media jog, M-button, source button.3Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026Top panel: AUX input, source selector, audio controls for volume, bass and treble, M-button, media control, power switch. Pull the power switch to turn on.

Capacitive touch controls for play, pause, skip, replay, volume slider, voice assistant mute and grouping, Bluetooth pairing button, Microphone switch1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Capacitive touch controls to play, pause, skip, replay, adjust the volume, mute the voice assistant and group or ungroup Sonos products. A Bluetooth button and a microphone switch are on the back.

Companion app

Marshall1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Compatible apps: Marshall app.

Sonos8Maker product pagesupport.sonos.com/en/article/sonos-app-requirementsRead 15 October 2026The Sonos app sets up and controls Era 300.

App platforms

iOS, Android3Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026Closing page offers the Marshall app on Google Play and the App Store.

iOS, Android8Maker product pagesupport.sonos.com/en/article/sonos-app-requirementsRead 15 October 2026An iOS or Android device is required to set up a new Sonos system or add products. The app also supports Fire OS.

User firmware updates

Yes3Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026Troubleshooting: connect to the Marshall app and follow the in-app instructions to get the latest firmware.4Maker product pagemarshall.com/us/en/support/speakers/support-for-stanmore-ivRead 14 October 2026Ensure the firmware is up to date by connecting the product to the Marshall app.

Yes7Maker product pagesupport.sonos.com/en-us/article/release-notes-sonos-system-updatesRead 15 October 2026System update release notes list Era 300 firmware versions. Updates install through the Sonos app and system, not by the user from a file.

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

0 of 17 differ

Built-in battery

No8Reviewtechradar.com/audio/wireless-bluetooth-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Designed for the home and powered from the mains. No battery is mentioned.10Reviewtomsguide.com/audio/smart-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Spec table: Battery life: Mains-powered.

No1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Power source: nearby electrical outlet. The speaker has no battery.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications list an auto-switching 100-240VAC universal input and no battery.

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.

Not available

Not available

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

Not available

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.

Not available

Not available

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.

Not available

Not available

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

Not available

Not available

USB Power Delivery charging

Not available

Not available

Charges other devices

Not available

Not available

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

Not available

Not available

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

Not available

Not available

Durability

None of 5 known

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

Not available

Not available

Floats

Not available

Not available

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

Not available

Not available

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

Not available

Not available

Carry featuresiPublished handles, straps, carabiners or wheels.

Not available

Not available

Measured

None of 6 known

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

Not available

Not available

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

Not available

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

3 of 3 differ

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.

Width350Height203Depth185mm(13.8 × 8 × 7.3 in)1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Physical unit: width 350 mm, height 203 mm, depth 185 mm. The product details block prints 350 x 203 x 185 mm.

Width260Height185Depth160mm(10.2 × 7.3 × 6.3 in)1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Store page labels height 7.28 in (185 mm), width 10.24 in (260 mm) and depth 6.30 in (160 mm). The launch factsheet and the user guide list 160 x 260 x 185 mm as H x W x D, which swaps height and depth. The store labels match the hourglass shape lying wide, and What Hi-Fi gives 16 x 26 x 18.5 cm as height, width and depth with the same swap.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications list 6.3 x 10.24 x 7.28 in (160 x 260 x 185 mm) as H x W x D. Axes follow the store page labels instead.

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

3,990g(8.8 lb)1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Weight 3.99 kg / 8.79 lb.10Reviewtomsguide.com/audio/smart-speakers/marshall-stanmore-iv-reviewRead 14 October 2026Spec table: 8.81 lbs, which matches 3.99 kg.

4,470g(9.9 lb)1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Page states 9.85 lbs (4.47 kg), stored as 4470 g. The user guide states 9.75 lb / 4.42 kg, which conflicts. The launch factsheet and What Hi-Fi give 4.47 kg.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Specifications state 9.75 lb / 4.42 kg. Not stored. It conflicts with the store page and the factsheet.

Body materials

MDF cabinet, PU leather covering1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026MDF cabinet made from FSC 100%-certified material. The covering is leather-like material, named PU leather in the maker's launch release.5Press releasegroup.marshall.com/2026/07/07/marshall-unveils-next-generation-acton-iv-and-stanmore-iv-speakers-for-the-homeRead 14 October 2026Release names signature PU leather wrapping and an MDF cabinet from FSC 100%-certified wood.

Post-consumer recycled plastic1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Era 300 features 40% recycled plastic. The launch release says post consumer recycled plastic.3Maker spec sheet (PDF)assets.sonos.com/media-kits/hardware/era-300/era300factsheet.pdfRead 15 October 2026Era 300 is made with post consumer recycled (PCR) plastic and packaged in 100% sustainably sourced paper.

Certifications

1 of 1 differ

FCC IDs

Not available

Not available

Other certifications

FSC 100% certified wood for the MDF cabinet (FSC C225755)1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026FSC 100% certified wood (FSC C225755). The claim applies only to the wood cabinet.

CE (EU declaration), RoHS5Regulatory filingsonos.com/pdfs/conformity/era-300-it.pdfRead 15 October 2026The declaration lists conformity with the Radio Equipment Directive 2014/53/EU and with RoHS II, and the CE marking follows.

In the box

1 of 1 differ

In the box

Stanmore IV speaker, Mains lead, Quick start guide, Legal and safety information1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Box contents: Stanmore IV speaker, mains lead, quick start guide, legal and safety information.

Sonos Era 300, Power cable (2 m), Quickstart guide1Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Box contents: Sonos Era 300, power cable 6 ft (2 m), set up guide and legal and warranty information.2Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Package contents: Sonos Era 300, 6 ft (2 m) power cable, quickstart guide.

Links

Not compared

Product page

www.marshall.com/us/en/product/stanmore-iv1Maker product pagemarshall.com/us/en/product/stanmore-ivRead 14 October 2026Maker's US product page for Stanmore IV.

www.sonos.com/en-us/shop/era-3001Maker product pagesonos.com/en-us/shop/era-300Read 15 October 2026Maker's US store page. The current US price is $499, which is not the launch price.

Spec sheet

Not available

Not available

Manual

assets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdf3Owner's manualassets.ctfassets.net/javen7msabdh/1Rv35yGbbxUe5eqN41fCsx/9c63350f5423c02844068a220dca6e81/Marshall_Stanmore_IV_OLM_260414_R1_2.pdfRead 14 October 2026Full online manual, 260414 R1.2, English first. Combined PDF with many languages.

www.sonos.com/en-us/guides/era3002Owner's manualsonos.com/en-us/guides/era300Read 15 October 2026Sonos user guide, Era 300 specifications.

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

1 of 1 differ

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.

2years13Maker product pagemarshall.com/us/en/policies/warrantyRead 14 October 2026US market. Marshall's policy of 2025-02-13 gives a two-year limited warranty on speakers bought from marshall.com or a US authorized dealer, counted from purchase or delivery. The maker's support page says one year for all products and an exclusive two years for purchases on marshall.com. The two pages differ for dealer purchases, so two years applies to marshall.com purchases only. Statutory rights are excluded.14Maker product pagemarshall.com/us/en/support/warrantyRead 14 October 2026Support page: all products carry a 1-year warranty, and speakers bought online at marshall.com carry an exclusive 2-year warranty.

1year9Maker product pagesonos.com/en-us/legal/termsRead 15 October 2026One year full warranty on all Sonos products from the date of the original retail purchase. US terms.

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