A special formula is used to calculate the box for a subwoofer, but this is a rather long and outdated method. Now there are many programs available for free use that will perform the calculations for you.
It is necessary
a program for calculating the subwoofer box
Instructions
Step 1
First, calculate the speaker parameters. In this case, it will be useful to read additional information on specialized forums in the event that you are assembling a subwoofer yourself for the first time.
Step 2
Measure and use frequency, power, resistance, depth, coil size, sensitivity, and so on in your calculations as well, before using the formula. Do not forget about the material from which the membrane was made, and about other similar aspects that may affect the calculation.
Step 3
Choose what type of acoustic design you will have. To do this, use the result of the ratio of the resonant frequency to the quality of the speaker itself. In case you are planning an open case or screen, use the FS / Ots ratio. If it is 30 (values can vary up to 50), then this type of design is available in this case.
Step 4
If the value turns out to be more than 50 and up to 80, it is best to make a closed case. If the value is in the range from 80 to 110, then the bass reflex type is used. In other cases (over 105-110), the bandpass is used. These conditions are required, otherwise you just have to do all the work again.
Step 5
Download the program for calculating the size of the subwoofer box. There are plenty of such programs on the Internet, it is best to download them from official sources. Also, if possible, choose Russian-language software with an intuitive interface.
Step 6
Next, enter the speaker parameters calculated by you for the case of your subwoofer, taking into account the selected type of acoustic design. In the future, do not delete this program in case you suddenly have to redo the type of design of your subwoofer. Apply the resulting calculations in practice.
