What are the three amplifier operating modes available?
The A4TI can operate in three different modes: bridge, parallel, or stereo. The operating mode is selected using the MODE selector switches (item 7 for CH3-CH4 and item 9 for CH1-CH2) on the rear panel.
From the official Dbtechnologies A4TI Professional 4 Channel Power Amplifier manual, page 2
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