Sony MHC-V02 Help Manual page 102

Help Guide
Home Audio System
MHC-V02
There is severe hum, noise, or distorted sound.
If there are obstacles between the system and your BLUETOOTH device, remove or avoid the obstacles.
If there is equipment that generates electromagnetic radiation, such as a wireless LAN, other BLUETOOTH device,
or a microwave oven nearby, move them away.
Turn down the volume of the connected BLUETOOTH device.
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