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The most efficient amplifier would be one that has the highest Power Amplification Factor, or PAE (Power Amplification Efficiency). PAE measures how well a power amplifier transforms the input power into output power. The ideal case would be an amplifier with 100% PAE, but that’s practically unachievable due to real-world limitations. The closest you can get are Class D amplifiers, which can reach PAE levels of 90-95%. They operate in switch mode, which greatly reduces power wastage and increases efficiency.