Last Update 07-08

New Release：Marshall Acton IV & Stanmore IV

Marshall now offers Acton IV & Stanmore IV Bluetooth speakers starting at $329.99.
Free shipping within the US.
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Editor's Pick: Both new models feature an upgraded acoustic combination with a new bass reflex tube and tweeter, support Dynamic Loudness, and come with AUX and RCA inputs. The Acton IV and Stanmore IV retain Marshall's iconic vintage aesthetic design, with MDF cabinets, PU leather wrapping, and brass control panels, while the new M-button allows quick switching to EQ presets.

Acton Series Comparison
Specifications	Acton III	Acton IV	Key Upgrades
Frequency Response	45 – 20,000 Hz	37 – 38,000 Hz	Significantly extended low and high frequencies, deeper bass and clearer treble.
Total Amplifier Power	60W (30W bass + 2×15W treble)	110W (60W bass + 2×25W treble)	Power nearly doubled, delivering more dynamic and powerful sound.
Bluetooth Version	Bluetooth 5.2	Bluetooth 5.3	Upgraded Bluetooth protocol for faster and more stable connections.
Audio Codec	SBC	SBC, AAC, LDAC, LC3	Now supports high-definition audio codecs including LDAC for high-fidelity transmission.
Multi-Device Linking	Not supported / Basic Bluetooth	Supports Auracast™	Enables synchronized audio broadcasting across multiple speakers via Auracast.
Wired Input	3.5mm AUX	3.5mm AUX New RCA input	New RCA input allows direct connection to turntables and other devices without an adapter.
Button Interaction	Play/Pause/Skip buttons	Media jog New M-button	More intuitive interaction, M-button supports one-touch Spotify access or custom EQ.
Weight	2.85 kg (6.3 lbs)	2.65 kg (5.8 lbs)	Lighter overall, reduced by about 0.2 kg (0.4 lbs).
Product Dimensions	260 x 170 x 150 mm (10.2 x 6.7 x 5.9 in)	260 x 171 x 150 mm (10.2 x 6.7 x 5.9 in)	Dimensions remain largely the same, width increased by 1 mm.

Stanmore Series Comparison
Specifications	Stanmore III	Stanmore IV	Key Upgrades
Frequency Response	45 – 20,000 Hz	36 – 38,000 Hz	Significantly expanded frequency range for richer detail and deeper bass.
Total Amplifier Power	80W (50W bass + 2×15W treble)	110W (60W bass + 2×25W treble)	Output power increased by 30W, confidently handling larger spaces.
Bluetooth Version	Bluetooth 5.2	Bluetooth 5.3	Supports the latest low-energy Bluetooth with enhanced wireless performance.
Audio Codec	SBC	SBC, AAC, LDAC, LC3	Moves beyond SBC, adding support for Apple AAC and Android LDAC high-resolution audio.
Multi-Device Linking	Not supported / Basic Bluetooth	Supports Auracast™	Compatible with the next-gen ecosystem for synchronized multi-speaker playback throughout the home.
Wired Input	3.5mm AUX, RCA	3.5mm AUX, RCA	Input configuration remains the same.
Button Interaction	Play/Pause/Skip buttons	Media jog New M-button	Top panel controls upgraded, M-button offers personalized shortcut settings.
Weight	4.25 kg (9.4 lbs)	3.99 kg (8.8 lbs)	Optimized structure, overall weight reduced by about 0.26 kg (0.6 lbs).
Product Dimensions	350 x 203 x 188 mm (13.8 x 8.0 x 7.4 in)	350 x 203 x 185 mm (13.8 x 8.0 x 7.3 in)	Length and height unchanged, depth slightly reduced by 3 mm.