|
Yeah it is almost certainly the horizontal section she is hearing. I'm 21 and my hearing has not aged out of hearing frequencies as high as the 15,734Hz of the horizontal sections of my sets. My tube sets tend not to be bad enough to notice(ie I can hear it but my brain just tunes it out) most of the time, but it varies from set to set.
Worst set I ever had in the whistle department was a 2003 Sharp BPC set...Most annoying part was that the volume of the whistle was intermittent. It would be too quiet to notice one minute and hear it throughout the house loud the next.
|