Ear trumpets could be matched to specific hearing loss profiles.

Evidence

Consider, for example, the audiogram for damaged hearing given in Figure 2.19. Here, the average dBHL value for frequencies 250 Hz to 4 kHz would be {((10 + 5 + 5 + 15 + 60)/5) = 19 dBHL}, which indicates “no hearing handicap” (see Table 7.1), which is clearly not the case. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2360 (#expands, via linked claim)

Categorization

• XREF: connects to: Averaging hearing loss across frequencies can mask serious impairment — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2360; A good speaking trumpet makes a good ear trumpet with size adjustments; Hearing-impaired listeners need higher signal-to-noise ratios than normal hearers do

Broader Connections

• A good speaking trumpet makes a good ear trumpet with size adjustments #expands (0.82)
• Averaging hearing loss across frequencies can mask serious impairment #expands (0.78) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2360
• Hearing-impaired listeners need higher signal-to-noise ratios than normal hearers do #expands (0.72)