1. Frequency range: that is, the working frequency bandwidth of the power amplifier under the specified distortion and rated output power conditions.
2. Frequency response: The output gain of the power amplifier increases or decreases with the change of the input signal frequency and the phase lag changes with the input signal frequency. This indicator is the most important basis for assessing the quality of the power amplifier. The smaller the decibel value, the flatter the frequency response curve of the power amplifier, the smaller the distortion, the stronger the degree of reproduction and reproducibility of the signal.
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