Who they’re for
Hearing aids are considered for mild to profound hearing loss.
How the simulator fits them
The aids compress, following DSL v5's rules:1 soft sounds get the most gain and loud sounds the least, and the quietest sounds, well below soft speech, get no gain. Genetic profiles, and custom ones marked as hearing loss since birth or early in life, get DSL's targets for children, and the rest its targets for adults, which give less gain. Aids in both ears give 3 dB less. They're shown fitted to their targets, which real fittings often fall short of. For a conductive loss, the aid is fitted to the flat level, assuming normal bone conduction.
The A marks on the audiogram show where the aids bring each pitch. See the audiogram view.
Sources
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S. Scollie et al., "The desired sensation level multistage input/output algorithm," Trends in Amplification 9, no. 4 (2005): 159–197. ↩