To properly isolate sound, we want to start by decoupling the framing. This can be accomplished by using Soundproofing Clips and Drywall Furring Channel (Hat Channel / Track). This system performs two main functions. First, because rows are spaced 24″ apart (generally), the drywall is attached with far fewer contact areas. Second, Soundproofing Clips and Drywall Furring Channel are resilient. They allow a wall to flex, and this increases sound isolation as well as lowering the troublesome "primary low frequency resonance point".
The second important feature of the resilient clip and channel array is the introduction of resilience. Because the channel is attached every 48” by a resilient clip, the 48” span is allowed to flex slightly. This flex is very important to the system's overall performance.