My hearing loss came about gradually and finally got to the point that I hated to listen to my stereo. The music sounded two dimensional, lacked high frequencies and the bass was muddy. It sounded like I had cotton in my ears. I also have worse hearing in my left ear than my right ear so the soundstage was completely out of whack.
Hearing aids made a huge improvement. My audiologist was able to fine tune them to where the sound was close to the way I remembered it. It wasn't perfect though. The high frequencies lacked sparkle and clarity and there wasn't any improvement in the bass.
I downloaded Equalizer Pro (equalizerpro.com) and the Peace Equalizer GUI. They were very beneficial in fine tuning the sound. One nice feature about Peace is that you can save different leveling adjustments. I have one for my headphones and another one for my speakers. You can also adjust the levels for each speaker, even for speakers in a surround system. It was a big help to center test tones in the center of the soundstage and to make musical instruments and voices appear in their proper location.
It's important to remember that hearing aids aren't intended to reproduce the full spectrum of sound. Their primary task is to make speech more understandable which means they focus on a relatively small band of frequencies. The equalizer helped tremendously to boost the volume in the frequencies that my hearing aids didn't address.
I hope this is beneficial to you. Both Equalizer Pro and Peace are free so there's no cost to give them a try.