Audio Wiring / September 8, 2018 / Raquel Dufour.
To understand the function of the car audio crossover one must first review the role of the car power amplifier. The power going into the amplifier comes from the car battery. After passing through the amplifier, a stronger and more powerful signal then passes into the car’s speaker system.
You’ll need to run the wire into the passenger compartment. For this, you need an unused grommet, which is just a fancy word for a plug. You might find a large grommet and poke another hole in it. As a last resort, you might have to drill the firewall of your car and install an aftermarket grommet.
If you are preparing to hook up wires to the amplifier and you are not sure which is negative and which is positive, take a 9-volt battery and tap the speaker wire to the positive terminal of the battery. If the speaker first moves forward (or out), then you have touched the positive lead of the speaker to the positive terminal of the battery, and the remaining wire is negative. If the speaker’s first move is backward (or in), you have touched the negative wire of the speaker to the positive terminal of the battery.
Gather the following tools: knife or wire cutters, solder, and solder gun, crimps, stripper, screwdriver, screws. Plan the installation. Know where you intend to put all the components. For example, the radio commonly placed in the factory opening in the dash, the speakers are put in the factory openings in the front doors, and the rear speakers put in the factory openings on the back deck. The equalizer goes in the factory opening below the radio in the dash. An amplifier with built-in electronic crossover usually goes in the trunk. The car’s battery, which powers the system, is commonly under the hood, usually on the passenger’s side of the vehicle.