Alto Professional Alto TS412 2500W 12" 2-Way Active Loudspeaker with Bluetooth - Manual (Page 7)

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Example C : Two Stereo-Linked Loudspeakers + Two Extensions
Connect each of your mixer’s main outputs to Input 1 on the Primary and Secondary loudspeakers.
Connect the Mix Output from the left Primary loudspeaker and right Secondary loudspeaker to the
extension loudspeakers. Stereo-Link the Primary and Secondary speakers together. The
Primary/Secondary assignment is dependent on which speaker is connected to the Bluetooth device.
The Stereo-Link will only pass the Bluetooth audio.
Microphones
Mixer
Power Outlet Power Outlet
Extension
Loudspeaker (Left)
Extension
Loudspeaker
(Right)
Stereo-Link
Tablet
Secondary
Loudspeaker
(Right) Primary
Loudspeaker (Left)