Some pundits have dismissed witness testimony placing shots in the area of the grassy knoll because Dealey Plaza is an echo chamber.

But Dealey Plaza isn't an echo chamber, is it? Among the witnesses who identified a shot location, it was one of two places: The TSBD Building or the grassy knoll. An echo chamber would have created multiple sound sources such that the shots couldn't be pinpointed, or witnesses would have identified more than two sources.