Monster MT-SB512DA User Manual page 8

Wall Mounting Instructions (Soundbar)
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8 | PRODUCT OVERVIEW
Use a pencil to make drill hole marks on the wall
for the anchors. Make sure the marks are level
before drilling. Use a 6mm bit and power drill (not
supplied) to drill holes on the marks.
Insert plastic anchors into the holes and push in
until they are flush with the wall. Drive the screws
into the plastic anchors and tighten until the screw
head is approximately 3mm from the wall.