How to A/B Your Master Properly
Published · by Loopin
A/B comparing your master against a reference track sounds simple, but a few common mistakes — mainly around loudness matching — can make the comparison actively misleading rather than useful.
Level-match before you compare anything else
The single most important step is matching the perceived loudness of your master and the reference track before comparing anything else — the louder of two tracks almost always sounds better in a quick comparison, regardless of actual quality, which is a well-documented perceptual bias.
Use a loudness meter to match integrated LUFS between the two tracks as closely as possible before doing any critical listening comparison — skipping this step invalidates most of what you'll perceive in the comparison.
Use a genuinely comparable reference
Choose a reference track that's reasonably similar in genre, energy, and production style to your own track — comparing a quiet acoustic ballad against a dense electronic reference tells you little useful, since the two are aiming for genuinely different sonic goals.
A reference from a similar artist or a track you specifically admire within your own genre gives you a much more actionable comparison than a generic "well-known song" chosen without regard to style.
Switch quickly, not slowly
Rapid switching between your master and the reference, ideally within a couple of seconds, lets you catch differences your short-term auditory memory would otherwise lose — a slow switch, waiting 10+ seconds between tracks, makes subtle differences much harder to perceive accurately.
Many DAWs and dedicated comparison tools support quick A/B switching on the same playback position — use this if available rather than manually pausing and restarting playback each time.
Compare on the same system, same session
Do the comparison on one consistent playback system in one sitting, rather than comparing your master on headphones today against a memory of how the reference sounded on speakers last week — memory across sessions and systems is unreliable for this kind of precise comparison.
If you want to check on multiple systems, that's valuable, but do a full level-matched A/B on each system separately rather than mixing memories from different systems into one judgment.
Know what you're actually listening for
Go into the comparison with specific questions — is the low end comparably full, does the reference have more clarity in the vocal, is your master's overall energy competitive — rather than a vague, open-ended "does mine sound as good." Specific questions produce more actionable results.
If you identify a specific, genuine gap this way, that's useful, actionable information; if the comparison, done properly, reveals your master is genuinely competitive, that's useful confirmation worth trusting too.
Frequently asked questions
What's the most important step when A/B comparing a master to a reference?
Level-matching loudness before comparing anything else. The louder of two tracks almost always sounds better in a quick comparison regardless of actual quality, so skipping this step invalidates the comparison.
Should I switch quickly or slowly between my master and the reference?
Quickly, ideally within a couple of seconds. Rapid switching lets you catch differences your short-term auditory memory would otherwise lose, while slow switching makes subtle differences much harder to perceive.
What kind of reference track should I use?
One reasonably similar in genre, energy, and production style to your own track. Comparing against a stylistically unrelated reference tells you little useful since the two are aiming for different sonic goals.