The size of a speaker magnet does not directly determine the loudness of a speaker. The magnet in a speaker is an essential component of its overall design and performance, but its primary function is to provide a magnetic field to drive the speaker cone or diaphragm, which produces sound.
The loudness of a speaker is primarily determined by factors such as the power and design of the amplifier driving the speaker, the efficiency of the speaker's design, and the physical properties of the speaker cone or diaphragm. Other factors, such as the enclosure design and the acoustics of the listening environment, can also influence the perceived loudness.
While a larger magnet can contribute to the overall performance of a speaker by providing a stronger magnetic field, it is not the sole determinant of loudness. Speaker manufacturers carefully design and engineer speakers to achieve optimal performance by considering various factors, including magnet size, voice coil design, cone material, and other components.
In summary, while the size of the magnet is one factor among many that contribute to a speaker's performance, it does not directly correlate to the loudness of the speaker.