The most common type of amplifier at audio frequencies usually works the same way, these days. ADC -> DAC. It fully decouples (signal-wise) the input and outp

The most common type of amplifier at audio frequencies usually works the same way, these days. ADC -> DAC. It fully decouples (signal-wise) the input and output (no possibility of distortion). And component tolerance is less important. It's also more power efficient, potentially exceeding 90%, since power loss only occurs when the transistors generating the output switch on/off, and at audio frequencies transistors switch almost instantly.