Discussion
Why does an amplifier deliver more power into four ohms than into eight?
Answer: A
For the same voltage swing, halving the load impedance doubles the current and so doubles the power - which is why a power figure means nothing without the load it was measured into. The supply is unchanged, the devices dissipate more rather than less, and the loop gain is unaffected. Whether an amplifier can actually deliver that doubled power depends on its output devices and its supply, which is why the four-ohm figure is often less than twice the eight-ohm one. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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