Affinity
2.0
Additional Information Page 276
3.7 Application of the HIT440 Tests
3.7.1 Frequency Response
The frequency response equals the absolute sound level delivered by the hearing aid at each frequency
expressed in dB SPL. This may be measured for both microphone and telecoil. Prior to the measurement
remember to perform the Reference Test Gain and set the volume control to the correct position.
The frequency response curve gives you an overview of the hearing aid response and can thereby serve as
a verification procedure making sure that the hearing aid is providing the needed response.
Below an example:
shows the total response of
the hearing aid in dB SPL (y-
axis) for each frequency (x-
axis)
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