+1000 Fletcher Munson
It's settled science.
I bought a Schiit Loki Max a while back. I use one preset that resets everything to zero change, where I can twiddle the knobs to adjust poor recordings.
The other two I have programmed in different versions of the Fletcher Munson curves, corresponding to ~55-60 dB listening and to ~65 dB listening.
It has fundamentally changed my enjoyment of low level sessions.