Have you tried matching a stereo to your hearing?

Considering how poorly some of today's pop recordings are made, Mceljo might have a very legitimate concern.:-)

IF it was a wanted thing it would be being done, wouldn't it? SINCE no one is doing it (and it is easily possible and certainly someone or more have tried it), no one wants to do it.. simple. The logic which wants to 'fix' things for folks who don't want the fixing, is faulty. Mostly because of the reason I mentioned. The people with a hearing problem are either already wearing hearing aids, or are used to what they hear, and would NOT LIKE the sound if it was corrected to allow thier damaged ears to put the sounds normal folks hear into thier head. AND altering the sound enough to MAKE the damaged hearing seem to hear as normal, would damage the persons hearing much much more, because the very frequencies they have lost, are going to be extremely loud to make the ear hear it as if normal, AND that really loud frequency will destroy what is left of that frequency response in the ear.
A bad idea.

Personally I think everyone does without knowing that's what they are doing. There are people who like certain brands of equipment and others who don't care for that brand because of the sound. It doesn't really matter if it's cables electronics or speakers. An example - me personally can't stand Klipsch speakers because they are too IN YOUR FACE forward in the mid range. Others think they are great.
That's my opinion

OR, one COULD lower the SOUND of the frequencies THAT are heard, TO balance the FREQUENCY. PERHAPS, it's not being DONE because they haven't CONSIDERED IT. An idea worth considering.

go for it.
The easiest way would be a digital EQ box like a $300 Behringer, between the CD and DAC.