JBL GTH400-20107 manual Installation and use

GTH400-20107 06/03/98 15:49 Side 5

2. Installation and use

Refer to the “Crossover Frequency Adjustments” and “Speaker-Level Input Impedance Adjustments” sections of this manual to see if you will need to make alterations to their factory settings.

1.Disconnect the negative cable from the battery. Note: If the vehicle’s radio features a code type security system, make certain you know the code before disconnecting the battery!

2.Run a minimum AWG #8 power cable complete with a 60 amp fuse (not included) directly from the positive +12V battery terminal to the desired amplifier location. Keep the fuse within 6" of the battery terminal, and position it before the wire runs through any metal partition.

3.Note: All wiring connections should be made either by soldering with heatshrink tubing insulation or with high quality crimp-type insulated connectors installed with a professional-type, articulated crimping tool. Soldering crimp-type terminals is recommended for additional

security. Never use wire nuts, insulation-displacement connectors (i.e. ScotchLok type), or twist and tape connections. Do not use electrical tape; it will loosen with age and extreme temperatures.

4.Mount amplifier in the desired location using the included screws.

5.Connect power wiring as shown in the Wiring Diagram on page 18.

6.Connect the outputs from the head unit to the appropriate inputs of the amplifier according to the Wiring Diagram (page 18) with either (or both) high quality low-level signal cables with RCA plugs, or the supplied speaker-level input connector.

7.Install the remote control in the desired location. Connect and run the cable from the remote to the amplifier.

8.Connect the speakers to the ampli- fier according to the Wiring Diagram on page 18.

9.Turn the gain controls to the 1/4-position for all groups.

10.Set the bass boost of each group to the desired position.

11.Set the crossover switches for each group as desired.

12.Set the Group 2 Input and Group 3 Input as desired.

13.Set the mode switches to Stereo, Left + Right, or Left Input Only operation for each group.

14.Double-check your switch settings. Reconnect the negative battery cable. Note: Incorrect switch settings can damage your speakers!

15.Turn on the signal source at a low volume level, and check for the correct output from each speaker.

16.Adjust the amplifier gain controls using the procedure described in the “Adjusting the Gain” section (page 25).

17.Read the rest of the manual to get maximum use and enjoyment from your amplifier.

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