The horn type loudspeaker works differently from the above three loudspeakers, and its diaphragm radiates sound waves to the surrounding space through a horn. We all have this experience in our daily life. When we need to shout to people far away, we often put our hands together and put them at the mouth, so that the voice can be concentrated and spread farther along a certain direction. Our mouth is like a driver. Two closed hands play the role of a horn. The horn speakers can be divided into round, square and rectangular according to the shape of the horn mouth. The circular and square horn mouth speakers have the same horizontal and vertical directivity. The rectangular horn loudspeaker has sharp directivity in the plane parallel to the long side and wide directivity in the plane parallel to the short side.
The advantage of horn type loudspeaker is that its impedance characteristics do not change with frequency, and it has good medium and high frequency characteristics and high electro acoustic conversion efficiency; The horn type loudspeaker has a sharp directivity in the whole operating frequency range, and is less affected by frequency changes. The disadvantage of horn type loudspeaker is that the working frequency band is relatively narrow, and the frequency distortion at the low frequency end is large. Due to the above advantages, horn type high frequency loudspeaker is still widely used in Hi Fi sound system.
