Which of the following is NOT a method used in hearing assessments?

Colorimetry is a technique typically associated with measuring the color of substances, not with assessing hearing. In the context of audiology and hearing assessments, it does not apply as a method for evaluating auditory function.

On the other hand, audiometry, speech testing, and tympanometry are all established methods used in hearing evaluations. Audiometry measures an individual's hearing sensitivity across different frequencies, providing insight into the type and degree of hearing loss. Speech testing evaluates an individual's ability to recognize and understand speech at varying volumes and in different backgrounds, which is essential for understanding how well someone can communicate. Tympanometry assesses the functioning of the middle ear by measuring the movement of the eardrum in response to changes in air pressure, which helps identify issues such as fluid in the ear or eustachian tube dysfunction.

Thus, the correct response highlights that colorimetry does not belong in the realm of hearing assessments.