because throwing 6 pieces of mdf in a square doesnt mean it will be a sufficient box for a sub. He would have to pay for plans at least if he did want to build it himelf. Plus i got him covered. Im building one for him the same price as a prefab a local place he went to quoted him, I'd say thats **** good.why dont u just build a box worth 40 ..instead of spendin a 100 dollars...