It’s Just A PhaseClearing up the confusion regarding the often misunderstood concept of phase, and also looking at the differences between phase and polarity...
By Andy Coules • June 27, 2019
In my experience of teaching live sound, one of the most commonly misunderstood concepts is that of phase. The source of the misunderstanding typically derives from a confusion between the concepts of phase and polarity.
So let’s take a look at these two concepts and see how they relate to live sound.
The first time most people come across phase is when they’re introduced to the “phase reverse” button (denoted by a circle with a line through it at 45 degrees: Ø) on the input channel of an analog mixing desk.
Usually it’s explained as the solution to the issue of thin sound resulting from multi-miking a single instrument. The problem here is that this button is actually a polarity invert switch – what it does is swap pins 2 and 3 of the input XLR connection – thus inverting the polarity of the signal...
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