What is the size of the dashboard speaker in the old Jetta?

[JadeFitz]

The dashboard speaker in the old Jetta is 3.5 inches. Below is an introduction related to car audio: 1. Magnet size: The magnetic strength of the magnet affects the control force on the diaphragm, which is related to the size and density of the magnet. This is particularly evident in the woofer unit of audio systems. With the same magnetic density, the size of the magnet determines the magnetic strength and thus the level of control. 2. Woofer unit diameter and long stroke: The diameter of the woofer unit determines the depth and volume of the bass. The volume of bass is related to the amount of air moved; the more air moved, the stronger the bass. With the same stroke, a larger diaphragm can move a greater volume of air.