Purely tonal EQ (for subjective appeal rather than balance) can freely use boosts and analogue character

When EQ is used for corrective balance purposes (to prevent frequency masking between tracks), cuts are preferred over boosts because they avoid loudness bias and phase artifacts. However, when EQ is used purely for tonal improvement—making a sound more appealing in its own right regardless of frequency masking—the restriction on boosts is relaxed. In this context, the coloristic character of classic analogue equalizer designs (API, Neve, Pultec) is often as important as their frequency response, and using boosts to add subjective ‘sheen’ or ‘body’ is appropriate. The key distinction is intent: balance EQ versus tonal EQ require different rules.

Examples

Balance EQ on a guitar: narrow cut at 300 Hz to reduce masking of the bass. Tonal EQ on same guitar: broad Neve 1073 mid-boost at 3 kHz to add presence and character.

Assessment

Explain the difference between balance EQ and tonal EQ. Describe which type allows the use of boosts and why.