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Understand the difference between horn impedance of 4 Ω and 8 Ω

Hose pump news 2021-08-12 10:45 135

Impedance introduction

Impedance and resistance have the same unit, both of which are% 26omega;. Resistance acts as a barrier to current. Similarly, impedance acts as a barrier to current

Impedance can be any combination of resistance, capacitance and inductance that hinders the current. Because the impedance of capacitance to DC is infinite and the impedance of inductance to DC is zero, impedance is more used to describe the blocking effect of current in AC circuit

High impedance means that the impedance value is large, and low impedance means that the impedance value is small

   What is a horn

The trumpet is divided into several different musical instruments. A wind instrument is thin at the top and thick at the bottom. It is mostly made of copper. The other is a modern electroacoustic element, which is used to convert electrical signals into sound, also known as loudspeaker. It can also be used to describe a person who advocates and publicizes for others

The horn is actually a conversion device that converts electric energy into sound. When different electronic energy is transmitted to the coil, the coil generates an energy to interact with the magnetic field of the magnet. This interaction causes the paper tray to vibrate. Because the electronic energy changes at any time, the coil of the horn will move forward or backward, so the paper tray of the horn will follow, This action changes the density of the air and produces sound

   Impedance of horn

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), the transmission impedance (or characteristic impedance) of the signal channel line, etc. 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 operating frequency response range of the horn

It is not a fixed value, but varies with 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

   Horn 4 Euro 8 euro difference is

1. The horn internal resistance of 4 Ω is 4% 26omega;; The horn internal resistance of 8 Ω

Because the internal resistance of 2 and 4 Ω speakers is small, the voltage change will be more obvious than 8 Ω, so the sensitivity of sound quality is higher than 8 Ω

The 3 and 8 euro speakers have relatively small power and are suitable for playing bass, which is more low-key and suitable for high-quality sound

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