I have two 12" subs I am building a box for. I am going to get a 3/4 inch thick plywood and cut it and everything. Now both subs are going in the box and I was wondering how far apart the subs should be from each other and how far the subs should be from the top, bottom, and sides of the box. Thanks.

 

Equal clearence on each end, center them.

 

what subs, sealed/ported, what year car is it going in, coupe/vert?

 

12" memphis 4ohm
94 coupe

 

where the subs are in the box or how far from the edge does not make a difference. Getting the correct airspace, port length, that stuff matters......

 

Make sure you buy MDF not plywood.

The only issue with the space inbetween them relates to the strengh of the enclosure. MDF is much much stronger then standard plywood and even a couple inches between the two will allow for enough area to absorb the weight of the subs.