Some things reflect sound and others absorb it. Cloth and irregular shapes are both excellent sound absorbers. Many years ago I was part of a theatrical group that staged western hold-ups, gangster stand-overs, etc. for corporate functions. During one such event it a crowded ballroom I fired a 10 round burst of 7.62mm blanks into the air from my M60 and was surprised that people 30 feet away didn't seem to notice! Similarly, my early .22 suppressors had neatly machined baffles and were quite efficient, but I later changed to baffles that were rolled on a mandrel from tube (to save time and money) which left a rough serrated edge and they were noticeably better, even though the critical dimensions remained the same.
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