Discussion
Which quantity does a loudspeaker present to an amplifier?
Answer: D
A loudspeaker is a few ohms, and its impedance rises at its resonance and again at high frequencies because of the voice coil's inductance, so a nominal eight ohms may be four at one frequency and thirty at another. It is neither high nor purely capacitive nor constant. Because the load varies, an amplifier's power is quoted into a stated nominal impedance and its safe operating area must be checked against a reactive load rather than a resistive one. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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