JBL GX-A604 Owner's Manual page 11

GX-A604 INPUT CONNECTIONS: 2-CHANNEL OPERATION
Connect your source unit or processor's line outputs as shown in the illustration below. Use only the front left and right input connections and make
sure that the Input Mode switch is set in the "2CH" position.
See Set The Crossover Controls, on page 11, for information about setting the amplifier's controls for 2-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
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