The low band in this tool is a shelf filter centered at 60Hz, built specifically for boosting or taming everything in the sub-bass and bass range at once.
A boost of 4–7dB at 60Hz adds noticeable weight without needing to touch anything else. If the bass starts to sound boomy or one-note rather than punchy, that's usually a sign to pull back a couple dB rather than push further.
Boosting 60Hz makes bass louder, but tightness comes from your playback system's own control — pairing a strong 60Hz boost with the built-in Limiter helps prevent the loose, distorted low end that heavy bass boosts can cause on smaller speakers.