The rated impedance (Ω)

Impedance is refers to the vehicle speakers the ratio of the input signal of voltage and current, the units of ohms (Ω). Popular said impedance is car speakers to present the current resistance and bookshelf computer speaker is not equal to the resistance, but including resistance and reactance, which include the resistance and inductance and capacitance impedance and capacitive reactance of three parts, is the sum of the three on the vector.
Under the same voltage, impedance is smaller, the higher the current impedance is lower, the greater the current. In power amplifier and Multimedia Speaker power of the same circumstances, low impedance car speakers can obtain larger output power, but impedance is too low and can lead to owe the phenomenon such as damping and bass degradation. In general, the lower the car speaker impedance, and the more difficult to drive. Impedance is not a constant value, but by the frequency on the music and the changing of play, may be in a high frequency to more than a dozen ohms or 20 ohms, may also be at a low frequency to a ohm or below, generally at its resonant frequency between the formant of minimum impedance value as its nominal value. At present, most of the car speaker impedance is 2-8 ohms. Speaker impedance optimization value of national standard in our country there are 4 Ω, 8 Ω, 16 Ω (international standard recommended value for 8 Ω).