Axxman300
Philosopher
I first heard of this "opposite direction" phenomenon on the JFK section of the London Education Forum from user and gun enthusiast Robert Prudhomme. I Googled and browsed around gun forums and saw corroboration for this, where not only can the use of noise-suppressors in conjunction with supersonic ammunition distort the noise of a shot to make it difficult to locate it's origin, but in some cases it can actually sound like the shots are coming from the opposite direction of the shooter. Here are some gun nuts talking about it:
The problem is that none of those accounts are from the early 1960s, few are from a city setting.
John Plaster is a historian of MACVSOG, a unit which had all the latest silenced weapons. The only one with reach was their .45 rifle. Their men killed close-in, that's why most of their weapons were hand guns.
Ask BStrong what happens when you fire a suppressed weapon and then jam it into your pants as you make your get away...no really ask.
What are you talking about? If the noise caused by a subsonic bullet moving through the air is louder than the noise caused by the muzzle blast, the sound of the shot will be distorted. And earlier I provided a book that talked about how silencers can disperse the sound of the muzzle blast itself.
A supersonic round is as loud as a muzzle blast, but a subsonic round would depend on the caliber, and even then it comes down to the gun used.
You can't "disperse" a sound from its source. I was a studio guitar player, and spent a lot of time around microphones. Sound can be influenced by the setting it occurs, this is why some concert halls have fantastic acoustics, and why you can built a studio where Van Halen can play all night without the neighbors ever knowing they're working (unless they leave the door open). A good interior decorator can take a loud room with crappy acoustics and with a few tall potted plants, and decorative wall hangings can dial down the noise.
More to the point, sound changes over distance from its originating source. This is why I mike my amp from about a foot away, but the bass player has to place his mike about 12 feet away since the frequency doesn't fully develop until that distance. This is why I didn't hear Gene Simmon's bass as well as the guitars on the other side of the stage, even though I was 10 feet from them. The sound went right over my head. This is why I had a sonic hangover from Ted Nugent, because I sat in the back of the hall (Cow Palace - worst acoustics west of the Mississippi) and caught both the head-on blare of his amps as well as the back-slap from the rear and side walls.
At my place of work, guests complain of noise from the room next door, but we can't hear it from the outside because noise travels between the interior walls, but not through the thicker outer walls.
The US Army used to train at all hours at Fort Ord, and sometimes we could hear them 20 miles away as if they were on the other side of the hill due to atmospheric conditions. Other days you could drive past the coastal firing ranges on M-60 day with the windows rolled down and not hear a thing from 300 yards away.
Finally, as a ghost hunter I spent a lot of time in the dark listening. One incident I heard two men talking on an upper floor of an empty office building. I searched to no avail while the conversation continued until I tracked the source to a couple of guys about 120 yards away in a parking lot. The way they were facing with their backs to a solid, 2-story flat wall, focused the sound of their voices toward the building I was in where it resolved through a broken window off an interior wall. Had I quit on my search I would have walked out of the building certain I had heard disembodied voices, but instead I learn just how funky sound waves can be in the right conditions.
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