6input cOnnectiOnsInput ConnectorsUse 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 theback of the adapter. Tighten the set screws to secure the wires.LoosenScrew InsertWire TightenScrewAlways connect the (+) speaker wire to the (+) terminal on the adapter and the (–) speaker wire to the (–) terminal onthe speaker.impOrtant: Make sure the (+) and (–) bare wires do not touch each other. Touching wires can cause a short circuitthat can damage the source unit or the amplifier.When you’re finished, plug the adapter into the appropriate input connector on the amplifier.• You can use either input connector to connect a source component with a single mono subwoofer output.seTuP PrOcedureGTO subwoofer amplifiers include a setup CD with test signals that makes it easy to precisely set the amplifier’s inputgain to maximize the amplifier’s signal-to-noise and dynamic range performance with your vehicle’s audio system. Theamplifiers feature three Gain Indicator LEDs that provide all the feedback you need to quickly set the gain to the properlevel.cOntrOlsBefore setting the amplifier controls: Confirm that all connections have been correctly made, reconnect thevehicle’s negative (–) battery terminal and turn the audio system on.CrossoverControlBassBoostControlGainIndicatorLEDsGainControlset the crOssOverBefore you set the amplifier’s gain, we recommend that you set the Crossover controls for the subwoofer. Thecrossover is permanently set for low-pass operation.crossover controlThe Crossover control determines the frequency where the low frequencies sent to the subwoofer begin to be reducedin volume.