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Of course there are exceptions, for example, as Free Air subwoofers, which are designed to work in an open volume, but the efficiency of these subwoofers is very small, it is recommended to install them only as a last resort.Start Subwoofer Box Design
Imagine how much time you will need to calculate the length of a port by its area and the net volume of a box, then calculate the occupied volume by the port, add it to the net internal volume of a box, and only after that, calculate the dimensions of a box, taking into account the material thickness.
Next, you need to draw a box, on paper or in a program, it will take at least 20 minutes. If you want to visualize the resulting drawing in 3D, using SketchUp for example, you will also need at least 15 minutes, given that you have experience with it.
Our online calculator will make a subwoofer box plan, 3D model, and other calculations in about 0.025 seconds - we think it's convincing.