
Originally Posted by
ToddG
I have no idea whether a flash hider makes XM193 sound quieter or not.
But some simple physics: sound is vibration, not pressure, technically speaking. However, sound pressure (the amplitude of the sound wave, which is the difference between the maximum pressure of the wave and the "silent" air) is part of what determines the "loudness" of a sound as we perceive it. In humans, frequency also affects loudness because we perceive different frequencies to greater or lesser extents.
It's easy to demonstrate that pressure alone is not the same as sound. Jump in the ocean and dive down to about 30 feet. There is a lot of pressure on your ears (more than you'd notice standing in front of a loudspeaker at a rock concert) but not really much sound.
So a device which is measuring the pressure of a wave might not be giving a perfectly accurate description of the "loudness" being recorded.
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