Join Date: Jul 2003
Location: Minneapolis, Minnesota
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Room dimensions are important, but it is only one piece of the puzzle. Just because you have successfully achieved a proper room dimension and sound isolation techniques will not mean you will have good acoustics in the room. There are many other factors that contribute such as proper speaker placement, seating placement, RT60 issues, parametric equalization, dynamic range, proper sightlines, HVAC and electrical considerations NC ratings to achieve a smooth frequency response of the room.
In addition, the use of fiberglass insulation in walls alone will do a reasonably good job in absorbing higher frequencies, but will do nothing for the lower end below 250hz. In fact a standard residential room has a noise floor of 30db. Reference level for music and cinema ranges from 85db to 105db. Required transmission loss for proper sound isolation in this instance is 55db. A standard 2x4 wall with fiberglass insulation and half inch sheet rock nets a 30db transmission loss. You will be short 25db!