What should I do before turning on the A4TI for the first time?
Before first turn on, connect passive loudspeakers using 2-pole speakON cables appropriate for impedance and power, select the amplifier MODE and LINK MODE, connect balanced XLR input cables, set all level knobs to minimum, then connect the mains cable and turn on the amplifier. Adjust gain controls after audio signal arrives from your source.
From the official Dbtechnologies A4TI Professional 4 Channel Power Amplifier manual, page 3
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