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How to conceal wiring behind drywall
Start by mounting your television and television mount to the wall.
After doing so you will be able to remove the television and leave the mount on the wall. This will allow you to select a good spot to make a hole in the wall.
Cut two holes in the drywall, one near the television and one near the a/v receiver or other audio video equipment. Make sure to use a stud finder to determine the position of the hole will be between two studs (with at least 1 " of clearance on each side of the hole).