Audio Wiring / September 5, 2018 / Lillian Chastain.
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.
Perhaps the most time-consuming and most important element of a car audio installation is the wiring. There are power cables, ground cables, signal (RCA) cables, speaker wire and more. Then there is the connection of cables to ignition sources, constant 12-volt sources, etc. The process may sound overwhelming. However, if you attack it in small bites, you will find that it is not as difficult as you expect.
After connecting the speakers, run the wires to the amplifier and connect the positive wires to the positive inputs of the amplifier and the negative wires to the negative inputs of the amplifier. When wiring speakers together and to the amplifier, you need to consider the impedance, or ohms, a rating of the speakers as well as the ohms load of the amplifier. Amplifiers are constructed to “see” a specific ohms load. If the amount the amp sees falls below what it is capable of handling, the amp will shut off.
Connect the radio to a constant 12-volt source, an ignition lead, the amplifier turn-on, and the antenna. On newer cars, the constant 12-volt and the ignition wire connections can be made through the factory wire harness. On older cars, the fuse block can serve as the continuous 12-volt source.