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:

• (F_b) Box Enclosure Tuning Frequency
• (F_s) Speaker Resonance Frequency
• (V) Enclosure or Box Volume (CLICK HERE)

Air Compliance (AC): The calculator returns the air compliance in cubic inches.  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.

The formula for Air Compliance of a subwoofer is:

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

where:

• AC = Air Compliance
• F_b = Box Enclosure Tuning Frequency
• F_s = Speaker Resonance Frequency
• V = Enclosure Volume or Box

Subwoofer Calculators:

• Volume of a Subwoofer
• Enclosure Volume of Subwoofer from Air Compliance and Tuning Frequency
• Air Compliance of a Subwoofer
• Tuning Frequency of a Subwoofer