"Is there a top 3 "don'ts" that you have to fix in mastering?
1. The most common big criticism I have is not paying enough attention to the vocal. The vocal is everything to the success of a song. Make it loud enough to be able to hear the lyrics. The problem is, if the vocal level is too high, all the energy of the track disappears, if it is too low, you can't understand what is being said. If you want to be able to hear every word and you are mixing it, be sure to have a friend who does NOT know the words come in and tell you what is being sung. Once you know the lyrics, you can mix them very low and still understand them, but everyone else might miss some important words. It is hard, but crucial to get the right level.
Always cover yourself by doing one or two extra mixes with the vocal raised +0.5dB and another +1dB. Some languages need extra vocal level as more nuances of the language can easily get lost. Louder vocals are usually found on country music mixes, French and Japanese mixes.
2. Vocal sibilance not contained is a problem. As in item "1", some producers will make the vocal as bright as musically possible in order to have it be intelligible yet tucked into the track. Sometimes the vocal is simply too sibilant. These days where most big projects are being cut for vinyl it is even more important to control sibilance as it creates high amplitude, high frequency grooves that are beyond the ability of all but the best cartridges to reproduce and one gets a "spitting" sound on the sibilance. Controlling sibilance in the mix is by far the best place to do it as the de-esser will only affect the voice while de-essing during mastering necessitates compromising the brightness of the entire track.
3. A mix with a bright vocal and a dull drum sound is really a problem. The all important snare takes up a lot of spectrum and trying to brighten it with eq will make the bright vocal even brighter and quickly become unacceptable. It is a real trap that can only be helped by mastering from the TV track with a separate vocal a cappella track, something that most often is not an option."
If you're going to send you mix off to a mastering engineer, heed these points and you'll get much better results.
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