JBL GX-A604 Owner's Manual page 13

GX-A602 INPUT CONNECTIONS: 2-CHANNEL OPERATION
Connect your source unit or processor's line outputs as shown in the illustration below.
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.
L+L–R–R+
Line Outputs
Source Unit
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