Q418 8" Q Series 1.5 Cubic Ft Enclosure Square by Atlas Sound.
This 8" Q Series enclosure have a unique acoustical fiber board permanently affixed to the inner walls of the enclosure which effectively eliminates the "hangover" and vibration normally associated with large metal enclosures. To achieve additional rigidity, unique ribs are formed on the back side of the enclosure. In addition, the inner walls are lined with 1 1/2" thick fiberglass with a 1 1/2 lb./cu.ft. density, this is made to control unwanted resonances in the high end of the frequency spectrum.