When the volume of air within a sealed enclosure is less than the Vas of the driver, the air trapped within the enclosure acts as an acoustic spring that adds to the restoring force of the speaker. This system is called acoustic suspension, also referred to as a sealed enclosure. Acoustic suspension systems are relatively easy to design and construct. The output rolls off at 12dB per octave below the point where output is down 3dB from midband (F3). A well designed sealed enclosure will exhibit smooth frequency response with excellent cone control at sub-bass frequencies. When selecting a woofer for a sealed enclosure, look for Qts to be between .3 and .9, with a low Fs (below 40Hz).
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