i actaully have a brace on the top going across the top piece and a brace going down from the top piece like three t's and a bottom brace so i have no side problems i put the thought into this box i used 2 types of gorilla glue and 6 toobes of caulking the hardest part of caulking was the sides of the box but its winter right now so im not installing any subs untill spring then ill have better pics