Squeak,
Its a known fact that women can hear higher freq much better than men, and men usually suffer more industrial deafness for obvious reasons, why not get your hearing tested, what sort of a job did you have when you worked.
Tony
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Tyros 4/Pair SR 350/ PC with a i8 intel chip, XENYX 802, Ford Focus 2 litre/Tascam DR07/Brother printer/Designjet 500/ our Doris/5 Grandchildren/ white boxers short Kymart shipped over and Typhoo Tea Earl Grey