The lip is 3/4 and is so my rubber floor mats will go under it without making the box any taller. On my last box the mats were crushed below the box, this helps it lay flat. I'll try and get some dimmensions to you later. Thanks for the compliments. I screwed up when carpeting it in a few places, but I covered em up as best I could. If I get real motivated I might make a new box that downfires and is fiberglassed. The sub boxes are starting to pile up in the garage now.
