It's pitch differentiation. 100 Hz away from 750Hz is a lot closer in  
pitch than is 100 Hz away from 400 Hz.
 
 
73  -  Jim   K8MR
 
 
In a message dated 10/19/2013 5:36:58 P.M. Eastern Daylight Time,  
[email protected] writes:

When I  was a kid 750 Hz was the most popular sidetone frequency. I have 
noticed a  steady decrease in the consensus spot frequency over these 40 
years. I don't  know why. Maybe it has to do with hearing loss. Too many 'The 
Who'  concerts.


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