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.
These sound systems, which can pipe music to every room or to just a few, cost as high as $3,000 per room for behind-the-walls wiring (including speakers), to as low as $400 per room for wireless units. But whatever price point you choose, music will make your house sound like a million bucks.