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She meant >3500 Hz. So, 3500 Hz up to 20 kHz. The drug only appears to be reaching the beginning of the cochlea where all the high frequencies are located. (Most people do have a hearing loss or tinnitus at higher frequencies. Well, all people start to get a hearing loss at high frequencies...

I agree the frequency of a phone line is between 300 Hz and 3400 Hz (or at least used to be) and that appears to be sufficient to understand all words. So, I think it would be surprising if a hearing improvement above 8 kHz would make a significant difference in understanding words. Besides, if...