Hello,

I am currently constructing a sealed enclosure for a 12 inch woofer with a resonant frequency of 38 Hz.
My senior design mentor wants me to alter the resonant frequency of the speaker by using a smaller enclosure to shift the frequency at which it resonates to 100 Hz. Its is being used in an interferometer, not for playing music, so I do not need to worry about sound quality.

Does anyone know of the calculations used to alter the Fs?
Thanks!