As you can see from the spectrum analysis of the clip above, the sound of the spoken poem and certain frequencies are amplified depending on the size and shape of the cone. These frequencies are registered as the layered bands in the middle of the image.
This test confirms the listening properties of the cone shape as well as the filtering quality it has. In this experiment, the microphone/ear had to be right up against the small opening of the cone in order for the cone to have any noticeable effect.
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