Many people use headphones as an alternative to monitoring speakers. Headphones
provide isolation from ambient noise in the room where you are mixing, adding
additional clarity that may not be obvious in your speakers a few feet from your ears.
This clarity can be helpful for cleaning up low-level noise and pops created by
misaligned edits. However, don’t rely solely on headphones when you mix because
level and pan adjustments you make may be too subtle or delicate for the average
viewer listening to your movie on speakers a few feet away. Headphones often have a
different frequency response than full-range speakers, so if you mix using headphones
your audio may sound bass-heavy when played back on speakers.