GX-A422SI - JBL Car Audio Service Manual (repair manual). Page 10

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Connect your source unit or processor's subwoofer line output to the amplifier's left input, as shown in the illustration below.
NOTE: Use a "Y"-adapter to connect the source unit to the amplifier's left and right input jacks.

L+L–R–R+

See Set The Crossover Controls, on page 10, for information about setting the amplifier's controls for bridged operation.

To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 7.