Power amplifier is used in many fields, such as soundamplifier and electric vibration generator.
功率放大器在很多领域都得到了应用，比如音响、电动振动试验台等等。
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What the senior engineer knew was the connection between two sound components — such as receiver, mixer, amplifier, and speakers — went beyond two copper wires and some insulation.
However, either amplifier can be used with a surround sound processor if the processor has the capability of routing the unprocessed signal through when it is turned off.