Introduction to impedance of horn

    The common impedance mentioned in general audio equipment include the impedance of the horn, the input impedance of the front and rear stage amplifier, the output impedance of the front stage (the rear stage is usually not called the output impedance, but the output internal resistance), and the transmission impedance (or characteristic impedance) of the signal channel line wait. Since the unit of impedance is still ohm, Ohm‘s law also applies. In a word, under the same voltage, the higher the impedance, the less current will flow, and the lower the impedance, the more current will flow.

    The most common indication value of horn impedance is eight ohms, which represents that when the pair of horns are tested in the factory, when the 1kHz sine wave signal is input, the impedance value is eight ohms; Or an average impedance value within the working frequency response range of the horn. It is not a fixed value, but varies with the frequency. When the rear stage outputs a fixed voltage to the horn, according to Ohm‘s law, a four ohm horn will flow twice as much current as an eight ohm horn. Theoretically, a crystal rear stage with an eight ohm output of 100 watts will automatically change to 200 Watts when connected to a four ohm horn.

    When the impedance value of the horn drops all the way, the later stage outputs a fixed voltage, and the current flowing through it will become larger and larger. In the end, it is a bit like a direct short circuit of the horn line, so the impedance value will sometimes be as low as the limit of one ohm. Beyond this range, the machine will burn down. This is what people often say: the power of the later stage does not need to be large, but the output current should be large, which seems to be the truth if not.

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