Before we touch a slider, we must understand the philosophy. Most software EQs (like those in Roon, Audirvāna, or Equalizer APO) operate on the audio stream before it is resampled or processed. HQPlayer does things backward.
Even better: HQPlayer supports (WAV files created from Room EQ Wizard). This allows for linear-phase EQ—meaning you fix your room modes (booming bass at 50Hz) without smearing the transient response of your drums. hqplayer equalizer
Located in the main window under the Filter settings (or the "Pipeline" matrix in Desktop v4 and v5), the Parametric EQ is a real-time, IIR-based (Infinite Impulse Response) EQ. Before we touch a slider, we must understand the philosophy