What Is Mastering? A Complete Beginner's Guide

Mastering is tonal balance, and getting a track loud without destroying its dynamics or introducing distortion. That's it in a sentence. Everything else is detail on top of that.

Traditionally it was a technical, flat-transfer job. Back in the tape and vinyl days, mastering meant taking a recording on one medium and putting it onto another, tape to vinyl, with as little degradation as possible. You wanted the vinyl to sound exactly like the tape. Because of the limitations of analogue systems, changing from one format to the other required a little EQ and a little compression just to make things work properly.

The job has changed a lot since then. It's not about flat transfers any more.

Now it's mostly about people making music in less than ideal environments, and a mastering engineer trying to make that translate onto as many playback systems as possible. Whether it's a new producer or a veteran, they might not be making the track in the best environment. Sometimes literally: I've had tracks built on a plane, or across six weeks on tour. They still want to make music and they still want to play it out.

Producers in that position are often still talented and their mix is generally solid, because they understand their own setup. But the bottom end might be wrong because they were working in headphones, or the top end might be off for the same reason. So when it lands with me, it's often just a case of trimming some bass and bringing back some high end, the tonal balance and loudness work sitting on top of a mix that was already basically right.

Mixing builds the track: balancing and combining every individual element (drums, bass, synths, vocal) into one finished stereo file. Mastering takes that finished file and prepares it for release: broad tonal balance, loudness, and making sure it translates across systems. Mixing comes first, and mastering can only work with what the mix gives it. It's broad strokes, not a rescue for specific mix problems.

Take it as far as you can yourself, then use a level-matched reference track to judge where you actually are. If you're not sure, or you want the specific technique for doing that comparison properly, it's covered in full in the DIY guide linked below.