June 2006
Beginner
488 pages
13h 2m
English
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Distortion in power amplifiers, Part VIII: Class A amplifiers
There are two salient facts about Class A amplifiers: they are inefficient; they give the best possible distortion performance. The quiescent dissipation of the classic Class A amplifier is equal to twice the maximum output power, making massive output power impractical. But the nature of our hearing means that the power of an amplifier must be considerably increased to sound significantly louder. It is well known that power in watts must be quadrupled to double sound pressure level (SPL), but this is not the same as doubling subjective loudness; this is measured in Sones rather than dB above threshold, and some researchers have reported that doubling subjective loudness requires ...
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