Product Highlights:Ported EnclosureThe NVX XMDFP122 has a ported subwoofer enclosure design. Ported boxes allow air to move freely through the port creating a louder sound. This creates a bigger and louder sound and harder hitting bass compared to a sealed enclosure. This is because there are two mechanisms amplifying the sound one being the actual subwoofer itself and the other being the port on the side of the box. They also tend to run more efficiently and the additional airflow keeps the su