What Is Mastering?

Mastering is the final stage of audio production, in which a finished mix is polished, level-matched and prepared for release across formats and platforms. A mastering engineer fine-tunes overall tone, loudness and consistency so the work sounds its best everywhere, from streaming services and broadcast to cinema and club systems.

Mastering in Practice

Mastering became front-page news through the loudness war, the decades-long race to make records louder than the competition at the cost of dynamic range. Its most famous casualty was Metallica’s 2008 album Death Magnetic, mastered so aggressively that fans petitioned for a remaster after discovering the less compressed Guitar Hero III version sounded noticeably better. Streaming normalisation has since blunted the war, because platforms now turn overly loud masters down. For brand audio, mastering is the guarantee of consistency: the same sonic logo or brand track may play on television, a phone, a stadium PA and a hold-music line, and mastering, guided by standards such as LUFS targets, keeps it recognisably itself on all of them.