How do I switch between BRIDGE, PARALLEL, and STEREO modes?

Use the CH1-CH2 MODE selector (9) to choose which mode for channels 1 and 2. Similarly, use the CH3-CH4 MODE selector (7) to set the mode for channels 3 and 4.

From the official Dbtechnologies A4TI Professional 4 Channel Power Amplifier manual, page 4

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