Audio and Hearing Loss
You can use JRiver or another player that has an equalizer to correct for hearing loss in certain frequencies in order to hear more of the music or other audio. This has been discussed several times on our forum. You can find solutions in the following threads.
Matt helped his dad find a good solution:
mwillems and mwheelerk discuss:
Inflateablemouse asked about it here:
Hearing Aids vs Equalizer: