# Air Compliance for Subwoofer

Not Reviewed
AC =
Tags:
Rating
ID
Carol.Air Compliance for Subwoofer
UUID
09b6885f-caf5-11e3-b7aa-bc764e2038f2

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