Triangular Speaker Enclosure Volume Calculator

Norvan Martin

This calculator determines what the box volume of a triangle enclosure will be. Below is an illustration of the different dimensions of a triangle box that are important in calculating its volume.

Triangular Speaker Enclosure Volume

Measure your triangle box and plug the numbers into the triangle box volume calculator for the subwoofer box design below:


How To Use The Triangular Speaker Enclosure Volume Calculator

To use the triangle speaker enclosure calculator, simply enter the details of your box and hit calculate.

Be careful to ensure that you are entering the correct measurements. Check the illustration above to ensure that the dimensions are correct. 

The calculator will generate the gross box volume and net box volume in different measurements such as mm3, cm3, cl, l, and so on. It will also generate the box front angle in either radians or degrees.

Triangular Speaker Enclosure Volume Formula

Gross Box Volume = (((H-(T*2)) × (W-(T*2)) × ((A-(T*2)) + (C-(T*2)) )) / 2) /1728
Net Box Volume =Gross Box Volume – Speaker Displacement
Box Front Angle =tan-1(((H-(T*2))/((C-(T*2))-(A-(T*2)))))

H = Height
W = Width
A = Depth1
C = Depth2
T = Wood Thickness

Take, for example, you need to find the gross box volume and the net box volume of a triangular speaker enclosure.

The enclosure is 100 inches in height, 50 inches in width, 20 inches in “depth1”, 30 inches in “depth2”, 2 inch “wood thickness”, and 9 ft3 “speaker displacement”.

Here is the solution:

Gross Box Volume = ( (100(2*2)) × (50-(2*2)) ×(( (20-(2*2))+(30-(2*2)))/2)) / 1728
= ((100-4)*(50-4)*(((20-4)+(304))/2))/1728
= (96*46*42/2)/1728
= 53.6667 ft3

Net Box Volume = 53.6667 9
= 44.6667 ft3

Box Front Angle = Math.atan(((100(2*2))/((30-(2*2))(20-(2*2)))))
= Math.atan((1004)/((304)-(204))
= tan-1(96/10)
= 84.0531 °

Why Use A Triangle Speaker Box?

Most people use a rectangle or square box for their speaker and subwoofer enclosures. What is the advantage of using a triangle speaker box? 

triangle enclosure speaker

The main advantage of using a triangle box is that it easily fits in certain areas (like a corner of your house) or the trunk of a vehicle.

Some people may use more of a hexagon box. For example, if your vehicle has a hatch in the back and a rectangle or square box cannot fit a triangle box is a good choice. 

Are There Disadvantages To Using A Triangle Box?

There is no real disadvantage to using a triangle box. You can achieve the same effect as you would with a square box. All you need to do is to ensure that you calculate the volume correctly.

hexagon triangle subwoofer enclosure.JPG

It doesn’t matter much what the shape of the box is, as long as you are using the correct volume.

In other words, a square box or a triangle box doesn’t make much of a difference if the volume of both are the same. Think about all the different shapes and styles like transmission line subwoofer boxes for example.

This means that there shouldn’t be any difference in SQL or SPL as long as you build the box right (SQ = Sound quality SPL = Loudness of the sub). Of course, you must ensure that you seal the subwoofer box properly

However, please note that driver placement has more of an effect on output and timbre due to cabin gain and reflection.

As such, you shouldn’t just build a box with any old shape. What we are saying here is that it doesn’t make a major difference for regular shapes like rectangles, squares, and triangles. 

speaker box in trunk triangle

However, box volume is very important as it affects the output and response curve of the driver.

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Norvan Martin is the founder of He is a professional Electronics Engineer and is passionate about home theater systems and AV electronics. BoomSpeaker was created as an online hub to share his knowledge and experiences as it relates to home theaters and home audio electronics. My email: [email protected]  Connect on Pinterest and Linkedin