Amplifiers and Transmission Lines
POWER AMPLIFIERS AND LOADS
A line level audio signal will not directly drive a speaker because it cannot deliver the current required to maintain its voltage across a low impedance load. Speakers look like short circuits to line signals, even though sufficient voltage for low level reproduction may be present before the load is applied. So the power amplifier is inserted between the line source and the load to make current available as the signal voltage directs.
A power amplifier is a current converter, and the output has a source impedance much lower than its load. The power supply has high value storage capacitors which give it a low source impedance too, and it delivers current through the output ...
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