What's the difference between 120 magnetic horn and 100 magnetic horn?

120 magnet and 100 magnet refer to the outer diameter of magnetic steel, which are 120mm and 100mm respectively. The larger the outer diameter, the louder the sound the horn can emit, but the relative vibration frequency will decrease, and the noise is not as low as that with a small outer diameter. Therefore, the sound emitted by 120 magnetic horn will be louder and the vibration frequency will be lower than that of 100 magnetic horn.

Extended data:

The unit of frequency is Hz, abbreviated as Hz, and expressed by the symbol Hz. Commonly used frequency units are kilohertz (kHz), megahertz (MHz), gigahertz (GHz) and so on.

There are sometimes many frequency components in the electric signal carrying information; Mark the position of all these components on the frequency axis, and express the size of each component in terms of power or voltage, which is the "spectrum" of the signal. The frequency range it occupies is called the frequency band range of the signal. For example, in telephone communication, the frequency range of voice signal is 300 ~ 3400Hz；; In FM broadcasting, the frequency range of sound is 40 Hz ~ 15 kHz, and the frequency range of TV broadcast signal is 0 ~ 4.2 MHz. ?

Reference: Baidu Encyclopedia-hertz