A: This hum is usually from the power transformer inside the amplifier. The reason is mainly caused by the fluctuation of 220V AC power supply. For example, the original design is only based on 220V voltage, and the silicon steel piece of the transformer is not inserted tightly. When the voltage is high, there will be a “beep†sound. Since you don't usually notice or measure the voltage fluctuations, you will feel it is occasionally heard. If the loudness of the hum is too small to affect the music, you can ignore it, otherwise you should contact the manufacturer to find a solution. In addition, since the hum is a very low-frequency vibration, it can also be transmitted through the cabinet of the chassis, so it is also possible to reduce the humming by trying to make some shock or shock treatment to the cabinet.
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