At CMU, there is a building with a really long hallway that has amazing acoustics. In this experiment, I set up a feedback loop. On one end of the hallway, there is a microphone connected to a laptop. On the other end, there is a speaker connected to another laptop. The two laptops are connected via Skype calling. I play with my speaker's built in EQ, and play my violin to stimulate the resonant frequencies of the hall.
A better set up would be to use better equipment directly connected to each other, and have a stand-alone EQ to independently control what resonant frequencies are playing.
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