I was wondering, can we use two sound sources so as to create a destructive interference at the position of a recorder at home? If possible, what is the easiest way?
The only place where I have ever seen this done successfully, and actually heard the cancellation was in a room where there were no reflections from the walls or the floor (an anechoic chamber). In this case, the cancellation was so perfect that I couldn't hear anything. I took a couple steps laterally and then the sound returned. I was quite stunned. I think this experiment will be quite difficult to do at home unless you can come up with a way to prevent reflections from everywhere, including the ground! Of course, I would be foolish to suggest that it was impossible, but perhaps I am just not creative enough! Just for reference, an anechoic chamber looks like so: