Subwoofer Enclosure Tuning Calculator

Determine the optimal tuning frequency (Fb) for your ported subwoofer enclosure to achieve desired bass response and efficiency.

Calculated Tuning Frequency

-- Hz
Formulas & Notes
  • Ported Box Tuning (Fb): Fb = Fs × √(Vb / Vb_box)
  • Fs = Driver resonance frequency, Vb = driver Thiele-Small volume, Vb_box = enclosure volume
  • Adjust Fb to control low-frequency extension vs. transient response.
  • Sealed box tuning is primarily Fs; no port needed.

How to Use

  • Enter your driver’s Fs and Qts values from manufacturer specs.
  • Enter enclosure volume in liters.
  • Select box type: Ported or Sealed.
  • View the calculated tuning frequency (Fb) for your enclosure.
  • Use results to set port dimensions or confirm sealed box design.

Who Can Use

  • Subwoofer and speaker designers
  • DIY home theater enthusiasts
  • Audio engineers optimizing low-frequency performance
  • PA system and club sound designers

Where to Use

  • Home theater subwoofer setups
  • Professional recording or mixing studios
  • PA systems, live sound, clubs, or event venues
  • Custom car audio or bass reflex enclosures

FAQs

Fb is the ported enclosure tuning frequency where the subwoofer achieves optimal bass output.

This works for drivers with known Thiele-Small parameters (Fs, Qts, Vb). Unknown values may give inaccurate results.

Increase enclosure volume or slightly lower Fb to extend low-frequency response. Be mindful of port noise.
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