A JBL amplifier is used to provide power to subwoofers and regular car speakers. These amplifiers come in a variety of sizes and power outputs but are all installed in the same manner. In most installations, amplifiers are installed in the boot of the car, where they can be easily accessible. When the amp is used to power subwoofers, a popular installation point is on the subwoofer box itself. A good-quality installation kit designed to accommodate the power output of your amplifier is essential.
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Things you need
- Amplifier wiring kit
- Wire cutter
- Wire stripper
- Drill with drill bit
- Electrical tape
- Adjustable wrench
- JBL car amplifier
- Ring terminals
- Rubber grommet
Disconnect the connector from the positive terminal of the car battery. Use an adjustable wrench to loosen the bolt and place the connector off to the side.
Connect the power, remote, ground and RCA wires to the amplifier. The amplifier will have labels on each of the terminals. Most amplifiers require a screwdriver to loosen and tighten each of the wire terminals.
Connect the ground wire to a bolt on the metal floor of the boot. Strip away a half-inch of insulation from the end of the speaker wire and connect a ring terminal to it. Unscrew the bolt on the floor of the boot and insert the ring terminal. Tighten the bolt and secure the terminal. Make sure that the grounding wire is as short as possible Shorter wires result in less clutter.
Snake the RCA, remote and power cables to the front of the car. Depending on the make and model of the car, there is often a seam between the wall of the boot and the back seat that the wires can fit through. Pull the wires through there and bring them to the floor of the car. Whenever possible, try to push the wires under any plastic trim to remove them from sight. The sills on the bottom of car doors often pop up and provide a good place to run wires. It is best to run these wires on the passenger side of the car so that they will not interfere with pedals on the driver side.
Find a hole in the firewall of the car and push the power cable through. The firewall is the segment of the car that separates the engine bay from the passenger compartment. If there is not a hole in the firewall, create a hole by using a drill bit that will create a hole large enough to accommodate the power cable. Always check to make sure there are no obstructions on either side of the firewall so that you do not damage the car by drilling a hole. Place a rubber grommet over the power wire and push it into place on the newly drilled hole. The grommet seals the hole so water that might splash into the engine bay during driving will not enter the car's interior.
Attach the RCA and remote wires to the main stereo unit of the car. These wires will be run from under the dashboard and behind the stereo unit. The stereo unit will need to be pulled away from the dash to make the connection. The removal of the stereo unit differs from each make and model of car. The remote wire will attach to the wiring harness while the RCA wires can be plugged into the back of the stereo unit. When making a connection with the remote wire, make sure to strip away a piece of the rubber sheath and twist together the remote wire with the corresponding wire on the wiring harness. Wrap electrical tape around the wires to cover the exposed wire.
Cut a 15-inch segment of cable from the end of the power cable. Strip the rubber sheath from both ends of the 15-inch segment and from the end of the longer power cable. Attach the fuse box that is part of the amplifier wiring kit to the longer power cable and the shorter power cable. Attach a terminal ring on the other end of the short power cable. Place this terminal ring on the positive terminal of the car battery and replace the connector that was removed in the first step. Secure the bolt on the connector.
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