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1) to buy a car horn, first of all to see whether the label horn mark on a nominal impedance and the rated power is what you need; and then observe the appearance identification, horn wire is intact, cone without damage, broken, frame glue is strong etc..
2) when checking the horn of a car, you can gently press the paper basin with two hands and gently down, and listen carefully to the rubbing sound of the phase of the ring and the iron core. Do not force the paper basin too hard to damage the paper basin.
3) when the above content inspection meets the requirements, the test can be carried out. The horn access impedance and power amplifier circuit in accordance with the requirements, whether to listen to the speaker's voice is hoarse, harsh and should not sound, good car horn sound level, there should be full, harmonious, clear and beautiful, comfortable. It is best to choose the music you are familiar with in the test.