In Phase BX12SL 12" Sealed Subwoofer EnclosureChoosing a bass box can be hard as not many people sell them and ideally they need to be built by people who know subwoofer parameters, box design and understand how sound waves travel. Not to mention, have joinery knowledge. Our expertly designed boxes will fit into a majority of vehicles. Our box's panels are 20mm thick and we use high density MDF only for enhanced durability. This enables the box to have a long life and great bass performance. When