Alto Professional Mixpack 10 Guide D'utilisation page 5

Features
To remove the mixer from the
loudspeaker, press in and turn the dial
counter-clockwise. Open the back panel
of the other loudspeaker to access the
speaker and power cables.
To secure the mixer and storage
compartment door back in the speaker
enclosure for transport, push in and turn
the dial clockwise until the knob's tab is
vertical (see image).
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