From someone who is not a professional in the field, but loves the 
process of sound restoration and recognizes it's importance to history 
and who is an optometrist who professionally has his hands in the human 
sense of vision rather than the sense of sound:

Do sound restorers routinely get their hearing checked to rule out 
sensory induced bias?

DrG

On 3/6/11 4:04 AM, Tom Fine wrote:
> One man's opinions/experiences ...
>
> You need to use your ears.
>