For years, we've heard about smaller enclosures and saving space. Yet no matter how much we try to shrink the box, we have always been limited by the depth of the speaker. Shallow-mount speakers and subwoofers have existed for years, but the limitation for a long time has been that the smaller the mounting depth got the bigger the enclosure requirement. That kind of defeats the purpose, especially in trucks where space is slim. At the 2007 Consumer Electronics Show (CES), a new breed of shallow-mount subwoofer was introduced by various manufacturers-the long-requested small box shallow-mount sub.

Flipping through the pages of LRM, we see many different trunks set up in many different styles. Each configuration has its own limitation. Most times, we can compensate for the magnet size and other times you see free air subwoofers; that is subs mounted on a board that use the entire trunk as an enclosure. While there is nothing wrong with a free air system, you need to know that the subwoofers you're using are geared to work in this configuration, as many are not.

The vehicles where this new breed of shallow-mount subwoofers would be the optimal solution are single cab trucks, convertibles and big hydraulic trunk installations. The coexistence of hydraulics and music has always been a problem, and this would be a good solution to an age-old problem. The days of having to redo your racks to add in a sound system could be a thing of the past.

Our subject this month is a '70 Chevy El Camino that has been outfitted with an airbag hookup. The first incarnation of this ride filled the spare well in the bed area and used four 8-inch subs to compensate for the shallow area. Our goal was to fill the interior of the cab with music and leave the well area available for the newly designed bag system. Follow along as we hook up the cab with some shallow-mounted beats.