Cut your wood to your preferred measurements and your circles for your subs cut them an inch smaller than the size of the subs.
Step 1: 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.
Step 2: 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
Step 3: Install Subwoofers
Put your subs into your sub box and connect them to your desired sound system.