Panasonic SC-HTB400 Operating Instruction page 13

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Place the main unit in the desired position and attach each cord onto the
rack or table.
Make sure that the slack of the cord is minimal.
Do not lean the main unit against the TV or wall.
Screw eye
Attach the screw eye at a position capable of supporting over 30 kg.
Depending on the placement of the main unit, the screwing position of the screw eye may differ.
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