Speaker Box Calculator

The Speaker Box Calculator helps users design and calculate optimal sealed and ported speaker box configurations based on specific driver parameters such as resonant frequency, equivalent volume, total Q factor, and effective cone area.

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Guide to Using the Speaker Box Calculator

Introduction

This guide will walk you through the steps to effectively use the Speaker Box Calculator. This tool assists you in determining the best-suited enclosure volume for your speaker based on the driver’s parameters. You will also get recommendations on port tuning and frequencies associated with both sealed and ported box designs.

Inputting Driver Parameters

  1. Select the Box Type: From the drop-down menu labeled “Box Type,” choose either “Sealed (Acoustic Suspension)” or “Ported (Bass Reflex)” based on your design preferences for the speaker enclosure.
  2. Enter Driver Fs (Hz): Input the resonant frequency of the speaker driver into the field labeled “Driver Fs (Hz).” This value should be between 10 and 1000 Hz, entered in increments of 0.1.
  3. Enter Driver Vas (L): Provide the equivalent volume of the speaker driver in liters in the “Driver Vas (L)” field. Enter a value between 0.1 and 1000 liters, with the same level of precision.
  4. Enter Driver Qts: The “Driver Qts” field should contain the total Q factor of the driver. Acceptable values range from 0.1 to 10, with a precision of up to 0.01.
  5. Enter Driver Sd (cm²): Finally, input the effective cone area of the driver in the “Driver Sd (cm²)” field. The allowed range for this parameter is from 1 to 2000 cm², with adjustments possible in 0.1 increments.

Understanding the Results

After inputting all necessary driver parameters, the calculator will process the inputs and provide tailored recommendations:

  • Sealed Box Volume: The “Recommended Sealed Box Volume” is calculated using the formula driverVas * pow(driverQts, 2.87) * 1000 and presented in cubic centimeters, formatted to one decimal place.
  • Ported Box Volume: For the “Recommended Ported Box Volume,” the calculation driverVas * 1.4 * 1000 is employed, again formatted to one decimal place in cubic centimeters.
  • Port Tuning: If you’ve selected a ported box, the tool suggests a “Recommended Port Tuning” frequency using driverFs * 0.85, shown in Hertz to one decimal place.
  • F3 (-3dB) for Sealed Box: The tool calculates the F3 frequency for a sealed enclosure with the formula driverFs * (1.6 + pow(driverQts, 1.4)) and provides it in Hertz.
  • F3 (-3dB) for Ported Box: For a ported design, the F3 frequency is determined by driverFs * 0.74, also displayed in Hertz, rounded to one decimal place.

Conclusion

By carefully entering the required parameters, and interpreting the calculated recommendations, you can design an enclosure that optimizes the driver’s performance. Understanding these metrics allows you to make informed decisions, ensuring a higher-quality audio output from your custom speaker box.