REM Test
REMs
This test measures actual HA gain by comparing the difference between the HA target value and the sound pressure measured using a microphone probe tip in the ear canal. We used Affinity 2.0 software (version 2.6.0; Serif Ltd) to conduct the REMs. To validate the HA performance, the REMs were performed using speech stimuli divided into a soft level (55-dB sound pressure level [SPL]), a medium level (65-dB SPL), and a loud level (75-dB SPL) based on the National Acoustic Laboratory–NL2 prescription. For the SHAA, the gain control and parameters were modified manually to match the targets.