Making a Subwoofer Box
Cut your wood to your preferred measurements and your circles for your subs cut them an inch smaller than the size of the subs.
Assemble Your Sub Box
Grab all your measured pieces and put them together to create your subs. Some ends need to be cut as 45 degree angles.
Carpet the Sub Box
Grab your carpet and put on the whole piece over the top that way if you have any imperfections they'll be on the bottom
Install Subwoofers
Put your subs into your sub box and connect them to your desired sound system.