Your home theater room acoustic performance is indirectly related to noise transmission between adjacent rooms in your house. Neither you will want to disturb others with your home theater sound, nor will you want to be disturbed during a good movie with undesirable noise from outside. In other words, you may have to isolate the inside walls, floor and ceiling, as much as possible from the rest of the house. In such way, you will be able to control the impact of the sound system on the room itself as well as stop the transmission of sound from both within as well as outside.
Room soundproofing is best done by professionals as it is a huge and expensive project. However, it is possible to soundproof a room without spending big money. The reason is that the worst contributors to the sound transmission are windows and door rather than walls and ceiling. If you do not proceed in this direction, you may end up wasting thousands of dollars in unnecessary soundproofing. It is important to realize that noise reduction is different from noise absorption. Noise absorption is used to control the quality of sound within the room. Noise reduction techniques are used to control the flow of sound energy from one room to another. In other words, while the use of insulating materials between double drywall panels can effectively help to stop the noise from crossing the boundary, it won’t help to control the reverberation level of sound within the room.
 There are three things that can help you stop noise from leaving room boundaries:
1. Space. Space increasing helps to reduce noise.
2. Mass. The heavier the material, the more sound it will stop.
3. Dampening. Making the noise travel through heavy soft materials will help to dampen the noise.
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