| 31 Hz | -6 dB to -12 dB | Cuts subsonic HVAC/room rumble |
| 62 Hz | -4 dB to -6 dB | Eliminates low proximity-effect mud |
| 125 Hz | -2 dB to 0 dB | Preserves fundamental vocal weight (cut slightly if booming) |
| 250 Hz | -2 dB to -3 dB | Reduces "boxy" or "chesty" acoustic clutter |
| 500 Hz | 0 dB | Leaves core vocal tone natural |
| 1 kHz | +1 dB to +2 dB | Enhances nasal/vowel articulation |
| 2 kHz | +2 dB to +4 dB | Key zone: Maximize consonant intelligibility |
| 4 kHz | +1 dB to +3 dB | Adds presence and projection |
| 8 kHz | 0 dB to -2 dB | Controls harsh sibilance ("s", "t" sounds) |
| 16 kHz | -3 dB to -6 dB | Tames unnecessary high-frequency hiss |