Your "microphone" may have lost some sensitivity but the brain compensates. As frogman5 posted, stay with good quality resolving equipment (but don't need to go crazy). Your brain will train to this.
Later you can experiment with digital equalization (MiniDSP) and apply a gentle hf roll up to compensate. That may (or may not) bring back the cues for clarity and imaging your brain can use to create the sounds you will perceive.
Later you can experiment with digital equalization (MiniDSP) and apply a gentle hf roll up to compensate. That may (or may not) bring back the cues for clarity and imaging your brain can use to create the sounds you will perceive.