GTO-804EZ - JBL Car Audio Service Manual (repair manual). Page 6

Use RCA audio cables to connect source units with preamp-level outputs to the amplifier; use the supplied bare wire-
to-RCA adapters to connect to source units that don’t have RCA output connectors.

Use a small Phillips screwdriver to loosen the adapter’s set screws and insert the speaker wires into the holes on the 
back of the adapter. Tighten the set screws to secure the wires. 

Always connect the (+) speaker wire to the (+) terminal on the adapter and the (–) speaker wire to the (–) terminal on 
the speaker.

IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other. Touching wires can cause a short circuit 
that can damage the source unit or the amplifier.

When you’re finished, plug the adapter into the appropriate input connector on the amplifier. 

• For bridged operation: Connect to the left input of each bridged channel pair.

The Aux Out connectors are unfiltered pass-through output connections that let you connect multiple amplifiers to a 
single source unit, such as when you’re using separate amplifiers for front/rear speakers and a subwoofer. Connect 
the GTO-804EZ/GTO-504EZ’s Aux Out connectors to the subwoofer amplifier's input connectors.

The Aux Out connectors are fed by both the GTO-804EZ/GTO-504EZ’s front and rear inputs, so the subwoofer amp 
will receive an input signal regardless of how the source unit's fader control is set.

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