*Gross volume refers to the total internal volume of the enclosure before the displacement of speakers, ports and other internal structures is taken into account.Ĭalculating Internal Volume For enclosures With Dividers The gross internal volume of this enclosure is 2.20 cubic feet. Volume = 2.2012 Cubic Feet Gross (can be rounded to 2.20 cu. Now we can calculate the internal volume of the enclosure in Figure B by using the volume equation. This enclosure is built with 0.75 inch thick material all around.ġ2” – 0.75” – 0.75” = 10.5" Internal Height The internal height and internal depth can also be found by subtracting the thickness of walls from the external dimensions. Outside Width – End Panel Thickness – End Panel Thickness = Internal Widthģ6” – 0.75” – 0.75” = 34.5” Internal Widthįigure B shows the external dimensions of the finished enclosure. The internal width can now be found by subtracting the thickness of both end panels from the outside width of the enclosure. The thickness of each end panel is 0.75”. Internal dimensions can be found by subtracting the thickness of wall and dividers from an external dimension.įigure A shows a partially assembled enclosure with an external width of 36” To find the internal volume of an enclosure, internal dimensions must be used. Ft.) = Height (in.) X Width (in.) X Depth (in.) / 1728 The volume equation, shown here, is used to calculate volume in cubic feet when height, width and depth are measured in inches. If a volume is known in cubic inches, it can be divided by 1,728 to find the volume in cubic feet. We also know there are 1,728 cubic inches in one cubic foot. When we multiply three dimensions measured in inches together, the answer is in cubic inches. There are 1,728 cubic inches in a cubic foot By multiplying the height, width and depth together we can find the number of cubic inches in one cubic foot.ġ2” X 12” X 12” = 1728 cubic inches. Since most enclosure volumes are given in cubic feet, but we calculate their dimensions in inches, we need to know how many cubic inches are in a cubic foot. It is surprising how many people will look at this object and mistakenly conclude that it measures 3 cu. Intuitively, we realize that the volume of this object should be 27 cubic inches. In this case, the object is made up of 27 dies, each with a volume of 1 cu. In order to determine the volume of the die we must multiply these three dimensions together. The height, width and depth of this die are all 1 inch. Let’s look at a common six-sided die as shown below. To illustrate this, we will use simple flat sided cube shapes (like dice). The term “cubic” simply means “three dimensional” and is used to express volume in conjunction with well-known linear measures. To calculate volume, we need to accurately determine three dimensions. These steps are applicable for all enclosure types. Methods of determining an existing enclosure’s volume will be discussed as well as methods used to design a box to a given target volume. This tutorial will explain the steps used to calculate the internal volume of a speaker enclosure. Accurate enclosure volume calculations are essential for proper subwoofer system design.
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