From a medical point of view I do about 10 audiometry tests per day in my job. Noise Induced Hearing Loss(NIHL) is due to continuous noise which flattens the hairs in the cochlear. High frequencies go first(above 3Khz) obviously as low frequencies move slower so you don't hardly lose them.
There is a condition called Acoustic Neuroma which is a tumour(tumor USA) on the 8th nerve, this produces a marked hearing loss over the whole frequency spectrum.
Then again, we all begin to lose high frequncies as we get older, in audiometry, we use a program which takes in consideration the age and sex of the client.
The test goes through the sound spectrum of
1Khz,1.5, 2,3, 4, 6Khz, so you are testing individual frequencies
In the UK there are 4 catagories:
Cat 1 - acceptable hearing ability for age group
Cat 2 - Mild Hearing Impairment(around 20 % of the population)
Cat 3 - Poor Hearing
Cat 4 - Rapid Hearing Loss
Some clients show Cat 2 when they are young but don't change so when they get older they become Cat 1, sort of your age catches up with your hearing.
If you are exposed to 80dB for more than 8 hours in your job role you must wear hearing protection and be audio screened every three years(UK - HSE)
So going back to the flatwound versus roundwound, it would be difficult to realise the sound difference that accurately because we all know a vibrating string or vocal cord produces mixed frequencies.
Losing high frequencies also reduces your ability to filter out conversation in a crowded place. Oh yes Tubeperson..not hearing the wife is called selective deafness of which it is a common complaint in husbands LOL
(Terry C with a Dfung explanation) Bet you are all bored in reading this!!!!