Product Highlights:Sealed EnclosureThe NVX XMDFS121 has a sealed subwoofer
enclosure design. This means that the air is contained and does not enter
or exit the box. This creates a tighter more accurate sound than a ported
or vented enclosure. Because a sealed enclosure is competing less with air
the subwoofer enclosure tends to have a better transient response which
allows the system to respond more quickly to sudden changes. A sealed
enclosure also offers improved acoustic suspension and con