'Port noise' can ruin the sound of an otherwise good enclosure design. If you do not have the Xmax figure for your driver(s), leave the default value (it is an average value suitable for most subwoofers). If you want to use this calculator, first choose what size driver(s) you are using, then enter how many are in your enclosure.
We can provide you with comprehensive Subwoofer Box Calculator for online creating a high performance subwoofer enclosure. Build a ported box, sealed box for your low-frequency speaker. Make a subwoofer enclosure plan. Calculate a speaker box volume, port length and other parameters without getting confused in formulas. I have always thought the slot port info on the JL-Audio site was crazy. The formula seems to be too general. The calculator on loudspeakers101 works great every time for me. The slot port benefits from the additional resistance of the extended sidewall. Tuning Frequency Calculator. Enter the volume of your enclosure. Select your port shape (round or slot). Choose an inside diameter. Enter a length for your port in inches. Hit the 'Calculate' button! Get your tuning frequency (in Hz)!
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