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Sound Advice To the Editor: The article "Details for Damping Household Noise" (10/99) was excellent, but I disagree on a few points. I would not hang drywall from resilient channels on a ceiling, even if they were on 16-inch centers. The channels are designed to disconnect the drywall from the framing, so the drywall will definitely sag. The article also states that airborne sound can only travel through air pathways, but sound is actually transmitted more efficiently through solid objects. If you are trying to solve an existing sound problem, you should first determine if it is a high-frequency or low-frequency sound. High-frequency waves are measured in thousandths of an inch, have little energy, and can be effectively controlled by caulking and