Let's be honest-- one of the coolest parts of having a home theater system is the ability to crank it up and to surprise unsuspecting friends or relatives with a few explosions or surround-sound effects. And nothing helps to achieve this "surprise attack" of sound more than a stealthy install that doesn't have large speakers or subwoofers sitting out in the room. With the increasing popularity of on-wall and in-wall speakers, it seems the perfect time to explore the possibilities for creating a homemade stealthy subwoofer.