Car horn performance pros and cons mainly through the following indicators to measure:
1. Rated power (W) D
Car horn distortion has a lot of kinds, common with harmonic distortion (much by speakers inhomogeneous magnetic field caused by the distortion and vibration system, often) when the low frequency, intermodulation distortion (because of two different frequency signals to join the speaker at the same time, each other sound quality degradation caused by modulation) and transient distortion (because of the vibration system of inertia cannot keep up with the change of the signal, Thereby causing signal distortion) and so on. Harmonic distortion refers to the replay, the increase of the original signal does not have the harmonic component. The harmonic distortion of loudspeaker comes from the non-uniform magnetic field of magnet, the characteristics of vibration film, the displacement of voice coil and other nonlinear distortion. At present, the harmonic distortion index of a good loudspeaker is less than 5[%].
2. Sensitivity (dB/W)
The sensitivity of the car horn usually refers to the input power of 1W noise voltage, in the loudspeaker axial front 1m place measured sound pressure size. Sensitivity is a measure of whether the loudspeaker can reproduce the details in the audio signal in detail. The higher the sensitivity, the loudspeaker can respond to all the details of the audio signal. The sensitivity as a Hi-Fi loudspeaker should be greater than 86dB/W.
3. Directivity
Car horn on the different direction of the radiation, its sound pressure frequency characteristics are different, this characteristic is called the directivity of loudspeaker. It is related to the caliber of the loudspeaker. When the caliber is large, the directivity is pointed and the directivity is wide when the caliber is hour. Directivity is also related to frequency. Generally speaking, for low frequency signals below 250Hz, there is no obvious directivity. It has obvious directivity to the high frequency signal below 1.5kHz.