Very simple digital power amplifier power supply is generally used switching power supply, analog power amplifier with a transformer. If you can open it to see the analog amplifier is a high-power transistor output radiator is very large, and the digital power amplifier is very small, the weight is not the same! Digital power amplifier light analog power amplifier. The advantages of digital power amplifier are high efficiency, low heat dissipation requirements, simple peripheral circuit and low cost. Disadvantages The sound has a large distortion problem! The reproduction of human voice is poor. Analog power amplifier has the advantages of better sound than digital power amplifier, the disadvantages are high cost, high heat dissipation requirements, large weight, complex circuit structure, and high maintenance difficulty. I think you know by now what his original power amplifier was! And that's not a coil, it's a transformer. Ha-ha! Then make it plain! The digital power amplifier has low requirements on the power supply, and it does not heat much, so the radiator is small. But the sound is not as good as the simulation. Although the analog sound is better than the digital, but the efficiency is low, the power supply is high, and the radiator also wants to be large, but the sound advantage is obvious. Plus the above you like popular or anything is good this is a look to understand.