Slaymon
10+ year member
I need new audio eqiup
Don't you have an installation guide telling you the mounting size? What kind of sub is it? I'm sure you can look on the brands website for an installation guide and find the size to cut the hole. For making a whole.. Get a nail and tap it into the center. The get a piece of string or somethin and tie it around the nail and a pencil. But make sure its half of the size of what you need. Then just pull it out and then drag it around in a circle.