A loudspeaker's stated impedance rating, in Ohms. Represents the load the speaker provides to an amplifier under normal conditions.

The stated impedance rating of a speaker, used by manufacturers to represent the load the speaker will present to an amplifier. In fact, the impedance of most loudspeakers varies considerably with frequency, so the nominal impedance is only a very rough guide. In practice, the minimum impedance also needs to be known.

Speaker specification that describes a speaker's resistance to current and the load it presents to an amp.