Power amplifier, referred to as "power amplifier". In many cases, the rated output power of the host is not enough to drive the entire audio system. At this time, a power amplifier must be installed between the host and the playback device to fill the required power gap. The power amplifier plays a pivotal role in "organization and coordination" in the entire audio system, and to some extent dominates whether the entire system can provide good sound quality output.
[Appendix: Study on the efficiency of Class A push-pull power amplifier]
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