Everyday speaker box problems come down to one relationship between cone diameter, are you making a ported speaker box?, depth (d), driver quantity, height (h), magnet depth, magnet diameter, mounting depth, port diameter, port length, • port quantity, board thickness (t), width (w) and one way. This calculator turns those numbers into front and rear panel’s height (a), top and bottom panel’s length (e) and front and rear panel’s width (b), with the working shown so you can check the result rather than simply trust it.
What Is the Speaker Box Calculator?
The speaker box calculator turns cone diameter, are you making a ported speaker box?, depth (d), driver quantity, height (h), magnet depth, magnet diameter, mounting depth, port diameter, port length, • port quantity, board thickness (t), width (w) and one way into front and rear panel's height (a), top and bottom panel's length (e) and front and rear panel's width (b).
It is a quick way to get from the numbers you have to the number you need, without setting up a spreadsheet or reaching for a formula.
How the Speaker Box Works
Each result follows from the ones before it, and the calculator shows every step, so a surprising answer can be traced back to the input that caused it.
Round your inputs to the precision you actually know, and keep more precision than that in the intermediate steps.
Getting a Result You Can Trust
Run the calculation twice with slightly different inputs. A sensible calculator moves its output in proportion; a wild change points to a unit or a decimal point problem in what you entered.
Write the inputs down next to the answer. It takes a moment and it is the difference between a number you can explain and one you cannot.
A Worked Example
Working through an example, with cone diameter set to 10, are you making a ported speaker box? set to 1, depth (d) set to 5, the calculator returns port volume of 314.15927, and • total port volume of 314.15927, and small radius of 100. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out front and rear panel's height (a)?
Enter cone diameter, are you making a ported speaker box?, depth (d), driver quantity, height (h), magnet depth, magnet diameter, mounting depth, port diameter, port length, • port quantity, board thickness (t), width (w) and one way. The calculator then works through the relationship and reports front and rear panel's height (a), top and bottom panel's length (e) and front and rear panel's width (b).
What does the speaker box actually calculate?
It takes cone diameter, are you making a ported speaker box?, depth (d), driver quantity, height (h), magnet depth, magnet diameter, mounting depth, port diameter, port length, • port quantity, board thickness (t), width (w) and one way and converts them into front and rear panel's height (a), top and bottom panel's length (e) and front and rear panel's width (b) using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter cone diameter?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.