Before and after mastering: how to hear what really changed
A master is almost always louder than the mix it came from, and louder sounds better. That makes the most common before/after comparison unfair to the mix and flattering to the master. Here is how to hear what mastering actually did to tone, width and dynamics.
Take loudness out of the equation
Match the two by integrated loudness before listening. Once they are equally loud, the differences that remain are the real ones: EQ balance, stereo image, punch, density, how the low end sits.
If the master only sounds better when it is louder, that is worth knowing too.
Listen on the same beat
Switch between mix and master without stopping playback, so you hear the same bar in both. Focus on one thing per pass: the low end, then the vocal, then the transients, then the width.
- Low end: tighter, or just louder?
- Vocal: closer and clearer, or harsher?
- Transients: still punchy, or flattened by limiting?
- Stereo: wider, and does it still hold up in mono?
Check it where people will hear it
Most listeners meet a master on earbuds, a laptop or a phone speaker, not on studio monitors. Run the same level-matched comparison on those as well: a master that only wins on big speakers, or that falls apart in mono, has not finished its job.
Keep the comparison short and repeat it. Ten seconds of the busiest part of the song, switched back and forth a few times, tells you more than one long listen to each version.
Show the client the same thing
Clients judge masters by what they hear first, and usually on a laptop or phone. Sending two files and a paragraph of notes invites an unfair comparison. A shared A/B link with the levels already matched shows them exactly what you heard.
Doing it in audiotoggle
Load the mix as A and the master as B, open Adjust levels and switch on auto-match. Label them “Mix” and “Master”, save the comparison and send the link: listeners hear the matched balance and cannot change it.