Marshall Acton IV vs Marshall Stanmore IV

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Acton IV compared with Stanmore IV

	MarshallActon IV	MarshallStanmore IV
Overview
Released
Released	July 2026	July 2026
Sound
Type
Type	Speaker	Speaker
Channels
Channels	Stereo	Stereo
Dolby Atmos
Dolby Atmos	No	No
Drivers
Drivers	One 4-inch woofer and two 0.75-inch tweeters with waveguides; bass-reflex cabinet with a redesigned port	One 5-inch woofer and two 0.75-inch tweeters with waveguides; bass-reflex cabinet with a redesigned port
Amplifiers
Amplifiers	One 60 W class D for the woofer, two 25 W class D for the tweeters	One 60 W class D for the woofer, two 25 W class D for the tweeters
Frequency response
Frequency response	37 Hz – 38 kHz; up to 95 dB SPL at 1 m	36 Hz – 38 kHz; up to 97 dB SPL at 1 m
Room tuning
Room tuning	Placement compensation and EQ presets in the Marshall app; Dynamic Loudness; bass and treble knobs	Placement compensation and EQ presets in the Marshall app; Dynamic Loudness; bass and treble knobs
Connections
Wi-Fi
Wi-Fi	No	No
Bluetooth
Bluetooth	Yes	Yes
AirPlay
AirPlay	No	No
HDMI eARC
HDMI eARC	No	No
Voice assistants
Voice assistants	None	None
Bluetooth
Bluetooth	Bluetooth 5.3 with Auracast; SBC, AAC, LDAC and LC3; multipoint; 10 m range	Bluetooth 5.3 with Auracast; SBC, AAC, LDAC and LC3; multipoint; 10 m range
Ports
Ports	Stereo RCA in and 3.5 mm aux in (the manual and feature list include RCA; the UK spec table lists only aux); mains power	RCA in, 3.5 mm aux in, mains power
Multi-room
Multi-room	Auracast with other Acton IV and Stanmore IV speakers; Acton III and Stanmore III through the Heddon hub	Auracast with other Acton IV and Stanmore IV speakers; Acton III and Stanmore III through the Heddon hub
App
App	Marshall app	Marshall app
Design
Weight
Weight	2.65 kg (better)	3.99 kg
Controls
Controls	Bass, treble and volume knobs, media jog, M-button, source button, power switch	Bass, treble and volume knobs, media jog, M-button, source button, power switch
Microphones
Microphones	None	None
Size
Size	171 × 150 × 260 mm (W × H × D)	350 × 203 × 185 mm (W × H × D)
Colours
Colours	Black, Cream	Black, Cream
In the box
In the box	Acton IV, mains lead, quick start guide, legal and safety information	Stanmore IV, mains lead, quick start guide, legal and safety information