Products that present voice or other audio may have methods of improving the quality of the audio. Frequency equalization is the most common method. This allows the user to adjust the tone of the output for more bass or treble. This feature is especially useful for the large number of people who are hard of hearing whose hearing loss is in the higher frequencies.
Enhanced voice quality addresses:
1193.43(e) Availability of auditory information for people who are hard of hearing.
There are no Product Types that generically include enhanced voice quality.