Why is there a hissing sound from the car audio system?

[DiNathan]

The reason for the hissing sound from the car audio system is that the audio signal cable is being interfered with by the power cable. To address this issue, it is necessary to replace the cables or separate the routing of the power and signal cables. Release static electricity promptly: When using a CD player, first touch other metal objects in the car to discharge static electricity before touching the audio head unit. This is because the winter climate is inherently dry, and turning on the heater in the car can make it even drier, leading to static electricity buildup. The instantaneous current from static electricity is enough to damage the audio head unit. Ensure the cleanliness of tapes and CDs: If the magnetic head encounters dirt while in operation, it can cause the head to deviate from its original laser track, resulting in distorted sound. Additionally, this may damage the magnetic head of the audio head unit, significantly reducing its lifespan.