Audio Wiring / September 10, 2018 / Autumn Fournier.
Once the different frequencies have been attenuated cut, from the signal fed into the amplifier, then the strengthened signal can be sent to more than one of the components in the audio system. For example, signals representing low-frequency sounds can route to the subwoofer. Signals representing high-frequency sounds can follow more than one path within the car speaker system. If the system contains tweeters, then the signals for the very highest frequencies will be sent to the tweeters. Signals for sounds that do not contain very high or very low frequencies will be sent to the car speakers.
The gauge of the power cable is determined by the specifications of the amplifier you are using. The owner’s manual that comes with the speaker will probably tell you what gauge cable to use. If it does not, consult with a tech advisor from the manufacturer of the amplifier to find out.
The audio preamplifier does not alter the power of the signal in the car audio system. The audio preamplifier provides the sound system with a way to gain voltage. After a signal passes through a preamplifier, and after that signal gains voltage, then it passes into a power amplifier. The power amplifier gives the signal more power; it raises the amount of current in the signal.
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.