 In its bare "before" state,...  In its bare "before" state, this '06 GMC Savanna lacks any sort of interest. |  The massive 10 cubic foot...  The massive 10 cubic foot cabinet for the quartet of subs had to be heavy-duty. Two layers of 3/4-inch MDF brought the ported box up to the desired density. |  The rear doors were removed...  The rear doors were removed and placed on custom sawhorses. Then, they were taped off and covered with mold wax prior to fiberglassing. Once the fiberglass shells were finished off, wood rings were added and mold fabric was stretched over it all. Resin and a layer of chopped fiberglass give it strength. |
 |  The bare-bones van was a noise...  The bare-bones van was a noise nightmare. The team muffled the reflective surface with four to six layers of Dynamat on the entire interior. |  |
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 At the base of the back doors,...  At the base of the back doors, the installers crafted 0.66 cubic foot enclosures for a CVT10 subwoofer. On top, they fashioned a mount for a 17-inch monitor. |  The Warhorse amplifier needs...  The Warhorse amplifier needs a lot of batteries to back it up. The installers built a battery rack out of MDF in the cargo space. |  Since the van has two audio...  Since the van has two audio systems, one for driving and one for demoing, a separate subwoofer enclosure was built up front out of MDF. |