Controls
Short answer
Use the controls on top of the speaker to connect your device to Stanmore IV, turn it on and off, adjust the sound and control your music.

Source Selector
Press the source selector button to switch between inputs. There are four inputs but only three indicators, because both Bluetooth modes use the Bluetooth indicator.
Broadcast mode (Auracast): Bluetooth indicator
Bluetooth: Bluetooth indicator
AUX: AUX indicator
RCA: RCA indicator
To start Bluetooth pairing, select Bluetooth, then press and hold the source selector button until the LED starts blinking.
Audio Controls
Adjust the volume, bass, and treble.
Customisable M-Button
Push the M-button to get the music started with Spotify Tap. Go to the Marshall app to change the M-button function.
Media Control
Play, pause, or change track when playing via Bluetooth.
Power Switch
Use the power switch to turn the speaker on or off.
Child lock
Press and hold the Media control button for four seconds to limit the volume to 50%. The light pulses twice to confirm.
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