Thank you Marshall.

As ExReg said I may have misinterpreted the wikipage on the subject, and got a little more to learn about this issue.
Luckily the flexibility of programming will allow me to easily reparameterize my %CONSTANTS as I learn to fine-tune my solution, so I'm not that worried about the specific values at this time.
I'll also follow your advice of making a full scale equalizer rather than a simple frequency filter, while taking the hearing test results into account for initial parameterization.

A sound card however is not the issue in my case, as the family member I referred to, is not comfortable with computers and watches the videos on a TV screen (via flash drive), which of course in not "open-circuitry". ^^

I'll look into the "Windows Equalizer" when I have a little more free time.
As for noise cancelling headphones, my family member dislikes headphones even more than not hearing properly, but even if that wasn't the case, the main issue is the noise originating from the videos themselves rather than external noises.
Also according to a professional, headphones/hearing-aid could actually worsen the hearing problem at this time, due to nerve entropy.

when(if) I finally finish writing this code, I'll turn it into a new CPAN module (got to learn how to do that too ^^) and add a link to it here, in hope it can assist you and anyone else with hearing problems.

I Thank you, and wish you minimal re-equalizing requirements in the future. ☻

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