Supersonic VS Subsonic

Published on April 24, 2024
Duration: 0:19

This guide demonstrates the audible difference between supersonic and subsonic 9mm ammunition when fired through a suppressed SIG MPX. Misha, a firearms enthusiast, objectively shows how supersonic rounds produce a distinct 'crack' due to breaking the sound barrier, while subsonic rounds are significantly quieter, with only the firearm's action and impact being audible. Proper firearm handling and suppressor use are showcased.

Quick Summary

The key audible difference between supersonic and subsonic 9mm ammunition, even when suppressed, is the 'crack' of the sonic boom. Supersonic rounds exceed the speed of sound, creating this distinct noise, while subsonic rounds travel below it, resulting in a quieter sound primarily from the firearm's action and impact.

Chapters

  1. 00:00Supersonic Ammunition Demonstration
  2. 00:08Subsonic Ammunition Demonstration

Frequently Asked Questions

What is the main audible difference between supersonic and subsonic 9mm ammunition when suppressed?

The primary audible difference is the 'crack' produced by supersonic rounds as they break the sound barrier, which is absent with subsonic rounds. Subsonic ammunition's sound is mainly the mechanical action of the firearm and the bullet's impact.

Can a suppressor eliminate the sound of supersonic ammunition?

No, a suppressor significantly reduces the overall sound signature but cannot eliminate the 'crack' caused by supersonic projectiles breaking the sound barrier. This sonic boom remains audible.

What firearm and accessories were used in the demonstration?

The demonstration featured a SIG MPX firearm equipped with a suppressor and a Holosun red dot sight, providing a clear platform for comparing ammunition sound profiles.

Why is subsonic ammunition quieter than supersonic ammunition?

Subsonic ammunition travels below the speed of sound (approx. 1125 fps), thus avoiding the sonic boom that supersonic ammunition creates. This results in a much quieter overall sound signature.

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