All audio configurations are done via the audio configuration app (such as realtek audio console, dell audio app, waves maxxaudio pro app, hp audio app, b&o audio app).
If your realtek audio console app doesn't have EQ or loudness equalization, it means that your computer has premium audio (dolby, dts, nahimic...) and those features have moved to the premium audio app --- such as this lenovo dolby app with volume leveler (which is "loudness equalization).