Dual Mono as Default Behavior in Premiere
One last question I also get asked is if there is a way to make this the default behaviour in Premiere Pro. In other words, can you make it so that every time you bring in a clip with stereo audio into Premiere it will be mapped to dual mono by default without having to do the process above?
Well, the answer is ‘yes’ and it’s done through your preferences.
Select your preference as follows:
PC = Edit>Preferences>Audio
Mac = Premiere Pro>Preferences>Audio
Then, in the middle of the panel you will fine the ‘Default Audio Tracks’ section and simply drop down the options beside ‘Stereo Media‘ and change it from ‘Use File‘ to ‘Mono‘.
Preferences for Premiere audio files
Now, the default behavior is for Premiere Pro to treat stereo clips as dual mono. Save yourself time (and headaches) with this handy Premiere Pro feature.
via Splitting Stereo Audio into Dual Mono in Premiere Pro – The Beat: A Blog by PremiumBeat.