Impedance in speakers

Impedance : It refers to the ratio of the voltage to the current of the speaker input signal. The input impedance of the speaker is generally divided into high impedance and low impedance. Those above 16Ω are high impedance, and those below 8Ω are low impedance. The standard impedance of the speaker is 8Ω.

When the amplifier and output power are the same, low-impedance speakers can achieve greater output power, but too low impedance will cause underdamping and bass degradation. So although this indicator has nothing to do with the performance of the speaker, it is best not to buy low-impedance speakers. The recommended value is the standard 8Ω. The impedance of headphones is generally high impedance - 32Ω is very common. The impedance of the amplifier can generally be marked as equivalent impedance, for example, 130W output at 4Ω is roughly equivalent to 80W output.

Under normal conditions, conductors have some resistance to the flow of current, and the degree of resistance is called "resistance", with the unit value of "ohm", codenamed "Ω". In AC circuits, in addition to resistance, inductance and capacitance also have the function of hindering the flow of current. The part that hinders the flow of AC current is usually collectively called "impedance".