|To determine the box size for a sealed enclosure
system, you will need to know the following Theile/Small parameters for the driver:
= Equivalent air compliance (litres)
Choose a final Qtc (total Q of system at resonant frequency) for your design. Recommended values for Qtc are from 0.6 to 1.0. Transient response degrades with higher Qtc values, but the power handling of the system increases. A Qtc of 0.7 will usually give pretty good results, but you can use a higher figure if the subwoofer has a low resonant frequency (<20 Hz) or if it's being designed for car use.
Qr = Qtc/Qts
Vb = net box volume (litres)