4. Installation and Use
4.1 Controls and Connectors
1.Preamp-Level Input Connector – Use these connectors for line (pre- amp) level inputs to the amplifier.
2.Preamp-Level Output Connector – Use these outputs to send signal to additional amplifiers.
3.Speaker-Level Input Connector – Use this connector for speaker level input signals. A wire harness is supplied for use with this connector. See “Audio Input Connections” section (page 23) for wiring instructions. This input also includes JBL’s Common Sense input circuitry which turns the amplifier on as soon as the high powered head unit connected to this input is turned on.
4.Speaker Output Connectors – Connect speaker wiring to these connectors. See wiring directions for more information.
5., 6., 7., 8. Power Connector – Connection for power wires. See wiring directions for information on proper connections.
9.Fuses – Two 30 Amp ATC type fuses.
10.Gain Controls – Use these controls to adjust the gain of the amplifier channel group. See the “Adjusting the Gain” section (on page 25) for tips on proper setup.
11.Preamp Crossover Switches – These switches control the built-in cross- overs that are directed to the preamp-output connectors. Set the switch to F (flat) for full-band operation for that group. Set the switch to L (low) to activate the low- pass filter on the pre-amp output group (for subwoofer use or to use in conjunction with a high-pass filtered input signal to create a bandpass crossover for a midrange or midbass driver). Set the switch to High-Pass to activate the high-pass filter for use with satellite speakers or tweeters on the pre-amp output group.
12.Speaker Crossover Switches – These switches control the built-in crossovers that are connected to each group's power amplifier cir- cuitry. Set the switch to F (flat) for full band operation on a group. Set this switch to L (low) to activate the low-pass filter on the selected amplifier group for subwoofer use or
