2008 Road Warrior Class C Motor Home Outdoor Subwoofer - Tricks Of The Trade

To mount the Alpine Type R 15-inch subwoofer, start by pre-drilling the holes using a 1/8-inch drill bit.

Carefully screw the woofer in place. Take your time because if the drill slips off of the screw it can easily poke a hole in the woofer's surround or cone.

Now that the woofer is installed we can screw on the front baffle. This will form a loading chamber to fire the woofer and port output down at the ground. With the box in place, the woofer is facing forward toward the back of the rear wheels.

A 1/8-inch-thick, 1 1/2-inch-wide angle iron is used to mount the enclosure to the frame of the RV. Start by drilling the holes in the long piece, then cut the angle iron to length with a chop saw or hacksaw.

Each 6-inch-long piece of angle iron is through-bolted to the enclosure with 1/4-inch bolts. Notice how the bolts through the box are staggered to increase strength. Two of these brackets are mounted on each side of the box.

One of my favorite tricks for wiring subwoofer enclosures is to run two 1/4-inch bolts through the side of the enclosure. On the back, the wires for the subwoofer are terminated with ring terminals that are placed under these through bolts. Once the enclosure is mounted, the wires to the amplifier can also be terminated with ring terminals and connected to the bolts on the outside.

The final step is to glue some 1/4-inch landau foam to the top of the enclosure to prevent rattles since it mounts to the underside of the RV's floor.

The enclosure is hoisted into place using a floor jack, then bolted to the RV's frame on the front and rear using 1/4-inch self-tapping bolts. The enclosure is completely stealth, at least until you turn on the stereo.