Usually, the tweeter and woofer of the speaker are arranged in a plane on the panel of the speaker. Their sounding centers cannot coincide with a point, otherwise the distance between the tweeter and the bass will be different from the ear, which will affect the correct restoration of the sound image. When speaking, the mouth is the point source of sound, but if you put a speaker next to it and speak at the same time, you will not know where the sound source is.

The coaxial speaker cleverly places the treble at the center of the bass diaphragm, which can ensure that the acoustic center of the treble and bass is on the same axis, close to the point sound source, so the sound field positioning is ideal, suitable for listening to vocals and violins etc.