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Only a buzzing sound from the speakers
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• There is no radio station broadcasting.
• Signals from the antenna to the audio unit are not transmitted.
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• Electric noise caused by the operation of internal circuit from the audio unit itself
• Atmospheric noise
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A buzzing or crunching sound and normal sound produced at the same time from the speakers
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• Though signals are transmitted from the antenna to the audio unit, electrical noise from other sources is greater.
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• Electrical noise caused by the operation of electrical components on the vehicle
• Electrical noise from high tension wires, transformer substation (factory), electrical feeder line (street car), or motorcycle.
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A thumping sound and normal sound produced at the same time from the speakers (FM only)
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• Noise occurs due to radio wave environment at specific places (e.g. in valleys between buildings). Noise varies when the vehicle itself or surrounding vehicles move. (FM only)
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• Interference between direct and reflected waves of FM signals causes noise (Multipass noise).
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