Audio Wiring / September 9, 2018 / Bristol London.
Today one gets the sense that all types of communication have chosen to convert to a digital system. Some digital equipment may have made its way into the sound system of the average automobile, but most the present-day cars still use an analog sound system. The requirements of an analog system dictate the construction of the audio power amplifier and the audio preamplifier.
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.
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.
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.