The green line is the target 'aided threshold' for a severely deaf person.

The gap between the red and the green lines is the 'gain' needed for this person to hear most speech sounds.

The best hearing aid for this person will give 'aided thresholds' like the green line.

This person has a profound hearing loss.

Hearing aids cannot give enough 'gain' for a profoundly deaf person to hear all speech sounds.

Target 'aided thresholds' for a profoundly deaf person are for the green line to be inside the 'speech banana'.

Checking hearing aids

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