What is the impedance of a single 4 ohm loudspeaker?

The impedance of a loudspeaker refers to the total opposition that the speaker presents to the electrical current from the amplifier, measured in ohms. When a loudspeaker is specified as having an impedance of 4 ohms, this means that under normal operating conditions, it will present a resistance of 4 ohms to the amplifier.

This value is critical as it plays a key role in matching the speaker with the amplifier; amplifiers are designed to output optimal power at certain impedance ratings. If you connect a 4 ohm loudspeaker to an appropriate amplifier, you can expect it to perform efficiently and deliver the expected sound quality.

The other options represent different impedance levels that typically correspond to various speaker types or configurations. However, in the context of this question, the correct choice highlights the standard value of the speaker’s impedance itself, confirming that the speaker indeed operates at that specified impedance.