$50 per song
Stereo mastering is the more common of these two types of mastering. It’s the final polish before mass production and distribution.
For stereo mastering, you take your final mixdown (or stereo track) that the mix engineer has produced, apply balance, EQ, and compression (if necessary), and tweak any other tonal enhancements or deficiencies that the track may have before it reaches its final place: on store shelves, on your merch table, or online for digital distribution.
This mastered track is normally louder, punchier, and more articulate than the mixdown.
$70 Per Song
Compared to stereo mastering, stem mastering takes things a little further and offers more options to a mastering engineer. That’s because a stereo master starts with just two tracks (the left and right of the mixdown), but a stem master consists of the separated elements of a track. For an example a stem of all vocals,music,drums and bass or any combination.