An increase in the amplitude or energy of an electrical signal with amplification. Gain is the difference in amplitude between the input signal and the output signal.

A hearing loss that is not caused by any organic condition. In other words it is a “psychological” hearing loss, because the hearing system is working properly.

The difference in a person’s responses between aided and unaided threshold measures. Functional gain is less reliable and valid than other methods of testing aided benefit.

Another name for an ITE hearing aid.

The range of frequencies to which a hearing aid can respond, adjusted to your degree of hearing loss.

A wireless assistive listening device that picks up a speaker’s voice through a microphone and transmits it, using radio waves, to a person wearing a corresponding FM receiver. The device effectively moves the speaker’s mouth right up to the hard of hearing person’s ears thus removing background noise and distance problems.