Gentlemen, long time lurker(years) but first time poster. I've come to the experts to help with this idea I have. I have a small storage space under the stairs of my HT room. The half door to access it is located 5' from the right front corner of the room facing across the width. The total volume of this space is 49 cubic feet (42"x48'x42"). I was thinking of building a box inside the space that would be screwed right into the current studs. The floor is vinyl over cement so I would imagine that is stiff enough. I have some 1" marine plywood that I build the box with. Budget is $2000 with an amp, maybe $2500 if that is the only way to go. The questions I have are as follows: 1)Is this a practical idea? I can fit 4 15" drivers in the opening if needed or 5 12" or 2 18" or a combination. 2)Would I need to cross brace this seeing that it is screwed into the framing of the house? 3)Any suggestions for drivers and power required? 4)Is this a large enough space to consider an IB setup? Any ideas, thoughts or suggestions are welcome.