During the auditioning phase of audio mastering, listening from different sources is important. But so is listening from a distance and at low volumes.

Listening from a distance allows you to hear the dynamics of your song in different ways. It also allows you to hear how the most powerful dynamics interact in non-ideal circumstances. You may find your highs are cutting through the mix too much. Or that vocals are getting lost or are dominating the music. Or that the sub-bass is drowning out everything in its path.