JBL GX-A604 Owner's Manual page 15

GX-A602 INPUT CONNECTIONS: BRIDGED OPERATION
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.
See Set The Crossover Controls, on page 11, 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 12.
L+L–R–R+
"Y"-Adapter
Source Unit
Subwoofer
Output
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