Parts Express Dayton Audio 18" Reference Series HO Subwoofer and Cabinet Package 4.0 cubic foot CNC-cut cabinet made of 3/4&quot; MDF panels with a 1-1/2&quot; thick front baffle Includes the ultimate in low distortion bass: Dayton Audio&apos;s 18&quot; Reference Series High Output sub Save 50% off the original price on the cabinet when you buy the sub at regular price