Normal-hearing test methods rarely transfer to hearing-impaired listeners

Evidence

An important reason is that the methods that are used for normal-hearing listeners are very rarely useful in cases of hearing impairment. Simplified methods and simplified apparatus have to be applied, and the following paragraphs try to help solve the problems. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1869