DISPENSER OPERATED CONTROLS
Most hearing aid models have facilities to adjust the hearing aid for the individual hearing loss. These facilities, which vary from switches and trimmers, to computer operated digital memories, are used to adjust e.g. amplification of low or high tones, maximum output, preset gain and compression (automatic gain control (AGC)).
Preset Gain Control
The hearing aid often has a preset gain control permitting a reduction of the maximum gain by up to 20 dB. The preset gain is adjusted to a position giving the user the most suitable operating range for the volume control. The preset gain control is also used to reduce maximum gain in order to avoid feedback (whistling). This function can be useful for children or for those ...
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