At what frequency range does the HF average full-on gain (HFA) evaluate gain?

The HF average full-on gain (HFA) evaluates the gain in a specific frequency range commonly associated with hearing aids. This assessment focuses on the higher frequency sounds that are crucial for understanding speech, particularly in challenging listening environments.

The correct choice indicates a frequency range of 1000, 1600, and 2500 Hz, which aligns with the critical frequencies where speech intelligibility is most impacted. Frequencies around 1000 Hz cover fundamental frequencies of speech, while 1600 Hz and 2500 Hz include higher formants essential for consonant recognition and clarity.

The other frequency ranges provided do not encompass the essential assessment areas used for evaluating hearing aid performance in regards to speech. Therefore, the chosen range of 1000, 1600, and 2500 Hz represents a targeted and standardized methodology for accurately measuring the performance of hearing devices in real-world listening scenarios.