By long, I mean something like (say) 2 km of detcord. Or perhaps multiple close spaced charges in a line over that distance, simultaneously detonated. Close up a single piece of explosive produces a sharp crack. Further away high frequencies are suppressed and it's more of a boom. However, given that the sound from a couple of km of detcord would be arriving for some 6 seconds, what would it sound like from one end? This must have been done by someone, somewhere.
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