Affinity
2.0
Additional Information Page 38
1.7.7 Master Hearing Aid (MHA)
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MHA is a hearing aid fitting procedure consisting of three hearing aid simulated high pass filters of -6 dB, -12
dB, -18 dB per octave and a HFE filter (High Frequency Emphasis) equivalent to -24 dB per octave through
the audiometric headphones. This gives a rough sense of the benefits of a hearing aid and what could
eventually be gained by getting properly fitted hearing aids. The filters can be activated individually on both
channels enabling the audiometer to serve as a 2 channel master hearing aid.
Required Items:
• The Affinity
2.0
hardware
• Licensed AC440 Audiometry module within your Affinity
2.0
hardware with MHA functionality
• Headphones or insert phones
• A microphone, CD player
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or wave files
Test Procedure:
When having performed the hearing assessment you may want to start discussing a possible hearing aid
solution. However, there is no guarantee that the patient is positive towards such a solution. He/she might
not even have acknowledged their hearing impairment and may therefore not be motivated or prepared for
this prospect. In this situation MHA may be useful.
1) Open the AC440 and enter the MHA screen by selecting Menu | Te sts | MHA.
2) Select headphones or inserts in the channel 1 output list.
3) Select CD, Microphone or Wavefile in the channel 1 input list.
If using CD press play on the CD player, and if using wave files you can Browse and play them in the
bottom of the screen.
4) In this example the simulation starts in the -12 dB filter. It may, however, be advisable to start in Lin
(no filtering) as listing to the input signal with one’s own hearing for a moment is likely to have a strong
effect when having to compare with the filtered input. The procedure is, however, up to you and the
defaults can be setup in the AC440 setup (see section 1.7.2.5).
5) Before mounting the headsets on the patient describe to them that this tool can give an impression of
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MHA requires an additional software license
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MHA using a CD player is only available on the Affinity
2.0
/Equinox
2.0
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