Check the listing for details. For 2 8" Massive Audio HIPPO 84 Custom Ported Sub Box Enclosure ~ ACRYLIC ~. Condition: New. Listed at 339.95 USD. This listing is for a custom ported enclosure for 2 8" Massive Audio HIPPO 84 subwoofers. We use a 4" aeroport to reduce port noise so you get nothing but clean clear bass from your subs. Also, the subs are recessed 3/4" into the box. All the joints are glued and screwed together to ensure that the box will hold up against the high output of the subwoofer for as long as you need it to. Enclosure Details: - 3/4" MDF Construction - Plexiglass - 1/2" thick - 20" x 6" - Port Tube - 4" x 11" aeroport - Cutout Diameter - 7.25" - Black automotive carpet (charcoal carpet may be substituted upon request) - Tuned to 34 Hz (adjustable by request) - Exterior Dimensions - 36"(wide) x 15"(deep) x 11.25"(tall) - Net Volume - 2.0 Cubic ft - Roughly 50 lbs - 2 Terminals included - Sealed air tight with liquid nails caulk