spacers i'm sure are just a spacer that is going to go between the sub and the box to raise it up 1/2" or 3/4" of an inch or whatever that is needed... only problem is that it also moves it closer to the seat and will probably rub on the bottom of the seat .. with the jl's they have foam surrounds so you'll see rub marks start and could possibly rub a hole in the surround bc of the friction .. but i'm just spitballing what ifs bc i don't have the sub/box to see if it'll hit and how bad ... but it's a likely option or they would've just make the box deeper to begin with
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