This is an A/B test of two lavalier microphones: a Tram TR50 and an Audio-Technica AT899. I hard wired both mics via XLR into a Canon C100, mounted the mics about 2" apart on my breastbone, and talked.
Then I set the shot up on a timeline in FCP, panned each channel to zero so each mic sounds in both ears, and broke it up to A/B section by section. The screen text tells which mic you are hearing.
Hope that makes sense.
![](https://i.ytimg.com/vi/gKvHmhrd12M/maxresdefault.jpg)