Several mentioned about the ISO 2003 Equal Loudness Contour (ELC). In the following, I will show you how to translate those curves into practices, i.e., use the notion to program the EQ presets in whatever the player you have. I used foobar2000 as the example but the notion can be adapted to any freq. bandwidth you have in the EQ. I have been using these presets listening to music for some time especially low-level listening at night and the experience is great.
