Discussion
What is meant by an amplifier's headroom?
Answer: B
Headroom is how far the output can rise above the average programme level before it clips, and since music has peaks ten or more decibels above its average, an amplifier needs several times the average power in reserve. The other options describe internal voltage margins, impedances and load tolerance. A specification expressed as a margin rather than an absolute value is one that depends on the signal as much as on the equipment, which is why programme material has to be named when it is quoted.
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