Is there a way to measure the sound intensity of the sound produced from a speaker without using the sound level meter? I just am curious how we can maybe measure such intensities of sound without using a sound meter. Because in most high school experiments it seems like they just automatically assume we take these decibels recorded on the sound level meter as granted without actually measuring these intensity levels ourselves.
the cheap but rough method has been to point the loudspeaker vertically upwards and sprinkle some dry sand on the cone, then turn on the sound. the height to which the sand particles bounce is a rough measure of the loudness of the sound.