Correction
In November's "Design the Ultimate Home Theater - On a Budget" we failed to give Performance Media Industries copyright credit for their drawings, figure G, I, 2 and 3 on pages 40, 42 and 44, respectively. We've also had numerous questions about installing resilient channel, as the drawings are somewhat contradictory. See PMI's revised drawing, which is for an ideal situation (the original drawing related to our existing room, which already had drywall). Ideally, resilient channel should be installed horizontally across the bare studs. In an existing room, use a sawzall to cut out the drywall in the spaces between the studs and attach the resilient channel to the remaining drywall-covered studs. The openness and depth of the space behind the resilient channel contributes to its effectiveness.