i was running a pair of jl 12w6v2's in my box and i plan on buying 2 magnum 12's but what i noticed is my box flexing a little with the jl's so i was wondering how i could go about bracing it. could i use a 2x4 and put it in the middle between the 2 subs and go front to back as like a beam and do the same top to bottom?