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.
Cindy Beyer, an audiologist and a senior vice president of HearUSA, the parent company of HearX, said in an e-mail that the company offers aids as low as $850 â but that the average cost of a hearing aid, according to a report from the Hearing Review and House Institute, is $3,000.am Tanzer, a founder of an online store called Embrace Hearing (where prices run from $399 to $899), said that private retailers had to raise prices to cover fixed costs. âWhen you think about your typical independent audiologist charging $6,000 for a set of hearing aids, heâs not getting rich,â he said.