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.
The cost of soundproofing will depend on the size of the area to be covered and the type of soundproofing to be installed. It is likely to cost a couple of hundred pounds to soundproof the walls of a room for example, with the cost of an electrician on top.