Boundary microphone uses
Boundary mics are one of the newest categories of microphones (apart from hydrophobic and digital) created in the USA in 1978.
Boundary microphones are generally an overlooked category of microphones with some interesting uses as they work on walls and hard flat surfaces, making them near useless mounted on stands or handheld.
Boundary microphones are made of an omni directional mic mostly enclosed in a capsule holder with an opening facing down towards the hard and reflective base plate which reflects sound towards the capsule. There is a natural 6db increase in sound from multiple in phase reflections which doesn't add any self noise, very useful for boosting dialogue.
This boosting becomes even more useful when placing on a wall by a ceiling because then 2 extra walls of reflected sound come into play and would add 18db increase. All without touching the gain.
They are also great for capturing room atmos with their equal frequency response.
You can also get half cardioid and even supercardioid versions of boundary mics for more use in interviews or conferences.
There are lots more uses than you might think for boundary microphones. There are of course lots of them for conferences and panel sessions but also a lot in sports. On the posts in boxing rings, walls of hockey rinks, in the floors of basketball games and many other venues.
I keep one of these in my kit also on the off chance interviewees don't like boom mics or feel intimidated and the interview can be adequately covered with one.
Keep in mind papers on tables and any movements that can be sent down the table to the mic though.
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