How to Calculate Internal Box Volume
- Area (rectangle) = Length x Width
- Area (triangle) = 1/2 Length x Width
- Area (circle) = 3.14 x Radius x Radius
- Area (circle) = .785 x Diameter x Diameter
- Volume (rectangular box) = Area (of one side) x Depth
- Volume (triangular enclosure) = Area (triangle) x Depth
- Volume (cylinder) = Area (circle) x Length
- 1728 Cubic Inches = 1 Cubic Foot
- 28 Liters = 1 Cubic Foot
For multiple-driver enclosures, you'll get the best performance by isolating each driver in a separate chamber. This prevents variations in speaker tolerances and input power from restricting system output. If building separate chambers isn't feasible, you can make sure that each driver receives the same amount of power by mounting two identical drivers in the same cavity and wiring them in parallel.
Given the extraordinary number of choices, selecting drivers can be a bewildering task. It requires an understanding of specs as well as a sharp set of ears. For some guidance, see the "Wire Service" column in the September/October CSR and talk to an experienced installer.
Once you've selected an enclosure type and the appropriate drivers, map out the design on paper. This will help you visualize the shape of the enclosure and may prevent unnecessary cutting. Before you take out your trusty saw, be absolutely sure that the enclosure will fit in your vehicle.
Build a Sub Enclosure