Background in the columns, how to fight?

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Challenger882020-05-27 10:43:29

Acustic systems

Challenger88, 2020-05-27 10:43:29

We have a pioneer 500w GM-A3702 amplifier. When connected to a PC (lin., front input) there is a hum in the speakers. I connected the phone to the amplifier, there is no background. I connected the headphones to the PC - there is no background. When the PC is off, there is no background. The problem appeared after a month of use.

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Challenger88, 2020-05-27
@Challenger88

When the power is connected to the PC through the rear panel, the background starts immediately after the PC is started.