While the trichromatic theory defines the way the retina of the eye allows the visual system to detect color with three types of cones, the opponent process theory accounts for mechanisms that receive and process information from cones.
Cost of Soundproofing One Room. The cost to soundproof one room generally includes $170 to $250 for new materials, $190 to $300 for professional labor and $20 to $36 in tools needed to complete the job, though the prices will be higher for larger rooms and more complicated projects.
1 According to RD.com, the average safe room costs $2,000 to $5,000 to build. 2  FEMA.gov claims that the average safe room can cost anywhere from $6,600 to as much as $14,300.3  The size of the safe room will be the largest determining factor in the price. If you need to have a safe room installed by the professionals, consider getting multiple quotes from contractors in your area on websites like HomeAdvisor.com. 2  For example, a 8-by-8-foot room can cost $9,000, while a 14-by-14-foot room can cost around $15,000.