This is the type of enclosure that the home subwoofer has. Different enclosures will vary in the sounds that they produce.
Bass Reflex: These enclosures are tuned top play louder than other types of enclosures. While the sound might not be as accurate, they are able to get louder when compared to other subwoofers with a similar amplifier.
Acoustic Suspension: These enclosures will produce an accurate bass. In comparison to a another type of subwoofer with a similar amplifier, a acoustic suspension subwoofer will not be as loud. However, the bass will be much more accurate and correct.