Air Compliance for Subwoofer

Not Reviewed
Equation / Last modified by Administrator on 2018/01/18 07:07
Carol.Air Compliance for Subwoofer

The Air Compliance for a Subwoofer calculator computes the Air Compliance volume for a subwoofer speaker based on the Box Enclosure Frequency, Speaker Resonance Frequency and the Enclosure Volume.

INSTRUCTIONS: Choose units and enter the following:

  • (Fb) This is the Box Enclosure Tuning Frequency
  • (Fs) This is the Speaker Resonance Frequency
  • (V) This is the Enclosure or Box Volume 

Air Compliance (AC): The calculator returns the air compliance in cubic meters.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

Air Compliance or equivalent air compliance is a relative measure of the volume of air that has the same compliance ("springiness") as the sub-woofer's driver suspension. The Air compliance is proportional to the Volume, so generally less air volume has a lower air compliance factor corresponding to being  more "springy", while more air, a larger Air Compliance represents a "looser" suspension.

Calculate Air Compliance

AC = `(F_b/F_s)^(1/0.31) * V`

  • A = Air Compliance
  • Fb = Box Enclosure Tuning Frequency
  • Fs = Speaker Resonance Frequency
  • V = Enclosure Volume or Box