Final answer:
An individual with a 60-phon hearing loss may only detect low-frequency sounds and require louder speech to recognize it as speech, facing difficulty particularly with higher-frequency female voices.
Step-by-step explanation:
The lowest level at which an individual can detect the presence of speech and recognize it as speech relates to their hearing threshold. Individuals with standard hearing can normally perceive sounds across a range of frequencies and intensities that enable them to understand speech. For those with hearing impairments, higher levels can lead to difficulty in speech recognition. Particularly, a person with a 60-phon hearing loss might only hear low frequencies and would require louder than normal speech to understand it. Additionally, since frequencies of female voices are usually higher, a person with such hearing loss may find it especially challenging to comprehend female speech.