Mastering follows 'do as much as necessary and as little as possible' — sometimes nothing at all

Mastering is a corrective and enhancement discipline, not a creative reconstruction. Its guiding principle is ‘do as much as necessary and as little as possible’: a well-mixed track may need nothing, and doing nothing is a valid, even praiseworthy, decision. Each process added — EQ, compression, limiting, imaging — carries side effects and can damage qualities that were already good, so a process should be introduced only when you can clearly articulate the problem it solves, never to ‘add value’ or justify a fee. ‘As much as necessary’ acknowledges that a poorly balanced mix or a loudness requirement can demand significant intervention; ‘as little as possible’ constrains the temptation to add more, keeping the engineer anchored to what the track actually needs and preserving the mix engineer’s intent. Practitioners frame the same idea as ‘first, do no harm’ (Bob Olhsson: figure out what people were trying to do, then do what they would do with your listening situation and experience) and as seasoning rather than cooking (Doug Sax: ‘I don’t make the stew; I season it’ — and add no salt if it needs none). The hardest skill is knowing when to leave the tape alone.

Examples

After setting the limiter, play the track; if nothing is audibly wrong, stop — don’t apply EQ ‘just in case’ or add compression because the chain feels incomplete. Doug Sax: ‘if you add salt when it doesn’t need any, you’ve ruined it.‘

Assessment

A student says ‘I always add at least a little EQ and compression in mastering to add value.’ Critique this using the minimum-intervention / ‘do no harm’ principle, and state what should drive each processing decision and what it means in practice to leave a mix alone.