Under the standard, this should provide the hearing aid user with normal use while using the hearing aid with the particular
wireless mobile device. A sum of 6 or more would indicate excellent performance.
However, these are not guarantees that all users will be satisfied. T ratings work similarly.
M3
+
M2
=
5
T3
+
T2
=
5
The HAC rating and measurement procedure are described in the American National Standards Institute (ANSI) C63.19
standard.
154 Health & Safety