JBL GX-A604 Owner's Manual page 9

GX-A604 INPUT CONNECTIONS: 3-CHANNEL OPERATION
Connect your source unit or processor's line outputs as shown in the illustration below. Set the input mode switch in the "4CH" position
NOTE: Use a "Y"-adapter to connect the source unit's subwoofer output to the amplifier's rear left and right input jacks.
See Set The Crossover Controls, on page 11, for information about setting the amplifier's controls for 3-channel operation.
To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.
Source Unit
Front Line Outputs
Subwoofer Line Output
"Y"-Adapter
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