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Bart's experiment led to a shock wave that shattered all of the windows in town -- as well as Homer's fridge full of beer -- but Kohler quickly ran into a problem Bart didn't face: a feedback loop.
Kohler spent some time arranging the megaphones to minimize the feedback, which remained audible, and then attempted to shout into the first megaphone.
The result was a sound that wasn't much louder than the test with only one megaphone, but was "a lot more distorted."
Kohler explained the power supplies inside the megaphones likely were not strong enough to amplify sound much more than a single megaphone.
Not content with the disappointing lack of volume, Kohler and his assistant set up the megaphones in a circle to create an ear-splitting "literal feedback loop."
The feedback loop measured 16 times louder than a vacuum cleaner.