phase reverse

20Mg

when september comes
Aug 5, 2009
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what is that and in under what circumstances do people use them ? i would like to hear your opinion :)
 
It reverses the phase (actually the polarity) of the signal by 180 degrees. Useful in multi-miked souces, like drums. I always go through every drum track and compare them in and out of phase with each other just to hear what sounds best. Usually the one where I get the boom :p

For instance, if the snare sounds fine by itself but thin with the overheads, reversing the phase on one of them should fix the issue.
 
Ooh! Just remembered that sometimes I use it to make synth (stereo)pads sound wider. Phase reversing one channel can make it wider BUT it might also make the signal disappear in mono. Be careful with that and always check your mix in mono at some point!
 
a lot of people get confused here.

flipping the polarity inverts the waveform - phase is to do with a slight time difference of the same wave when picked up by different sources.

if something is exactly 180 degrees out of phase with something, then hitting the polarity switch will fix it - otherwise to get things perfectly phase alligned AFTER its been tracked you'd have to nudge the waveforms very slightly.

if its almost 180 degrees out and you hit the polarity switch you may be minimizing the phase effects but certainly not resolving it entirely.
 
Point of procedure is to basically monitor in mono, bring your overheads up then bring your drum mics up one by one and flip em until they sound fullest. Phase coherency is key to mixing ease. Drums are the most annoying with that. Though with the amount we sample in metal it isn't quite so crucial as in other genres.