Why does a radio have a loud hum even with volume all the way down?

A radio may produce a loud hum even with the volume turned down due to electromagnetic interference from nearby electronic devices or power sources, which can create noise in the audio circuitry. Additionally, grounding issues or faulty components within the radio can amplify this hum. Poor connections or a malfunctioning power supply may also contribute to the unwanted noise. This hum is often more noticeable in radiOS with analog tuning or older models.