Unfortunately, all walls are somewhat flexible. Any motion caused by sound striking one side of the wall will result in sound radiated by the other side, an effect called coupling. If the sound hits a resonant frequency, the wall will boom like a drum. Most isolation techniques are really ways to reduce coupling and prevent resonances.
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The only cure short of tearing the wall down and rebuilding is to add weight, usually another layer of gypboard. This is most effective if the new gypboard is thicker than the original and if it is glued in place rather than nailed to the studs.
There is no point in doing this halfway-- you must cover all internal walls, preferably on both sides. Additional gypsum gives diminishing returns, but an intermediate layer of soft fiber board can be helpful.
Reverberation time is determined by the volume of the room. It can be reduced by replacing some of the hard, reflective parts of the the walls with soft, absorptive sections. Every material has some absorptive qualities. This is described by its coefficient of absorption, a number between 0 and 1, with 0 being totally reflective and 1 being an open window.
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The space between the walls should be at least one inch (wider if practical) and lined with fiberglas. website The air duct should be very long and lined with sound absorptant material. Get the heaviest solid door and frame you can find, and add gaskets as described above.
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