Audio only plays through stereo devices such as headphones and will not play through mono smart phone speakers

[Roger Averdahl]

If the left and right channel content were different, then they would not cancel one another out since they would not be exact opposites.
In short: Wrong. The difference we are talking about here is milliseconds and that´s why it is easy to get issues caused by out of phase audio. Out of phase occur even if the audio is not 100% inverted.

Recording a concert in stereo can sometimes be tricky due to this very issue. Or, recoring anything in stereo is tricky. It´s not an issue invented out of the blue.

Watch this video, “Audio Phase: Why You Need To Pay Attention To This”: https://www.youtube.com/watch?v=QeR5hRyAKqo&t

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