Audio Wiring / September 9, 2018 / Autumn Fournier.
Amplifiers have class according to their efficiencies. Class D car amps use transistors to control power distribution within the amplifier. When the voltage in the amplifier rises to a certain level, then the transistors in a Class D car amp will automatically turn off. This ability of the transistors to turn on and off allows the Class D car amp to draw less current than the Class A or AB amplifier. Because it draws less current, the Class D car amp also produces less heat. In other words, it is more efficient.
Use a self-tapping sheet metal screw and drill through the metal on the backside of the seat or into a part of the trunk floor NOT IN CONTACT with the gas tank. Remove the screw, and grind off any paint around this area. You want a conductive connection to the chassis. Drill the screw back into the hole you created, this time with the ground wire attached. Use some silicone sealant to seal up the bare paint area to prevent rust.
You don’t want to route signal wire next to power wire because that could result in noise entering the sound system. If power cable and signal cable must cross, cross them perpendicularly. Use well-shielded RCA cable. It will help prevent noise from entering the sound system. Ground the radio to the chassis. Connect the antenna to the proper antenna input on the radio.
Begin connecting components using 18-gauge or 16-gauge wire on the speakers. The cables run from each speaker to the amplifier. The longer the run, the more resistance on the fence. The larger the gauge size of the cable, the less strength.