Are you operating in the correct SPL window for high-fidelity listening?

We spend hours and hundreds of dollars properly setting up our turntables (or have the dealer do it).  Do you spend any time setting the correct db level for listening?

The Fletcher-Munson curves, also known as equal loudness contours, illustrate how human perception of sound loudness changes with frequency and volume. They show that at low volumes, the human ear is less sensitive to very low and very high frequencies, making midrange frequencies seem louder than they are. Conversely, at high volumes, the ear becomes more sensitive to low and high frequencies, making them seem louder.  See the ISO 226 standard.

I listen at the volume recording engineers use for mixing:  80 to 85 db. Anyone have any thoughts?