Why don't cars use 8-ohm speakers?

[McOmar]

The output impedance of car audio systems is generally 4 ohms. If an 8-ohm speaker is used to replace a 4-ohm speaker, the power output to the speaker will decrease, resulting in reduced volume. Here's relevant information about car speakers: 1. When the speaker impedance matches the amplifier's output impedance: The speaker can obtain maximum output power. If the speaker impedance is higher than the output impedance, it simply cannot reach the amplifier's maximum output capability; 2. Speakers serve as the audio signaling devices in vehicles. During operation, drivers can produce necessary audible warnings as required by regulations to alert pedestrians and other vehicles, ensuring traffic safety. They are also used for prompting actions and communicating signals.