JBL GX-A604 Owner's Manual page 14

GX-A602 SPEAKER CONNECTIONS: BRIDGED OPERATION
Bridged operation provides a single high-power channel for a subwoofer
Minimum speaker impedance: 4 ohms
Connect the subwoofer to the RL (+) and RR (–) terminals.) NOTE: You can connect two 2-ohm subwoofers in series to maintain the required 4-ohm
impedance for bridged operation.
14 14
+12V
Fuse 25A
Speaker
Subwoofer