The single biggest enemy of objective listening is volume. Due to the Fletcher-Munson curves (equal-loudness contours), our ears perceive louder sounds as having more bass and more treble intelligibility.
If "Mix A" is 0.5dB louder than "Mix B", you will almost always choose Mix A, even if Mix B has better balance or dynamics.
Pro Tip: Always use the "Normalize" feature in MixTester when comparing mixes that haven't been mastered yet. It levels the playing field so you can hear the actual balance differences.
Confirmation bias is powerful. If you know you just spent 4 hours tweaking the snare drum on "Mix v3", your brain wants v3 to sound better to justify the effort.
Blind testing separates the sound from the ego.
Auditory memory is incredibly short-term. Research suggests our precise memory for timbre lasts only a few seconds. Ideally, you want to switch between two sources instantly.
If you have to open two different windows, or stop one track to start another, your brain has already forgotten the exact texture of the reverb tail or the punch of the kick. Instant, gapless switching is the only way to make micro-decisions about compression and EQ.
When you first switch to a new mix, your perspective is fresh. Within 30 seconds, your ears begin to "accommodate" or normalize the sound.
Listen to references at low volume. Switch quickly. Trust that initial gut reaction of "this feels muddy" or "this hurts my ears." That first 5 seconds is how the rest of the world will hear your song.
Ready to put these rules into practice?
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