Subsonic vs. Supersonic - back-to-back

Published on April 19, 2024
Duration: 0:19

This video demonstrates the audible difference between subsonic and supersonic 9mm ammunition when used with a YHM R45 suppressor on a Glock 19. Supersonic rounds produce a distinct crack due to breaking the sound barrier, even when suppressed, while subsonic rounds are significantly quieter and lack this crack. The test highlights the importance of matching ammunition type to suppressor effectiveness for optimal sound reduction.

Quick Summary

Subsonic 9mm ammunition is quieter with a suppressor because it travels below the speed of sound, eliminating the 'crack' heard from supersonic rounds. While suppressors reduce overall noise, supersonic ammo still produces a sonic boom. Subsonic ammo is key for maximum sound reduction.

Chapters

  1. 00:00Suppressor Installation on Glock 19
  2. 00:09Firing Supersonic 9mm Ammo (Audible Crack)
  3. 00:17Firing Subsonic 9mm Ammo (Quieter Report)

Frequently Asked Questions

What is the main difference between subsonic and supersonic 9mm ammo when using a suppressor?

Supersonic 9mm ammo creates a distinct 'crack' sound because the bullet breaks the sound barrier, even with a suppressor. Subsonic ammo travels below the speed of sound, resulting in a significantly quieter shot with no sonic crack, making it ideal for suppressed use.

Can a suppressor eliminate the sound of supersonic 9mm rounds?

No, a suppressor significantly reduces the overall noise signature of supersonic rounds, but it cannot eliminate the audible 'crack' caused by the bullet exceeding the speed of sound. For maximum sound suppression, subsonic ammunition is recommended.

What firearm and suppressor were used in the subsonic vs. supersonic 9mm test?

The test utilized a Glock 19 pistol, equipped with an Olight Baldr S light and a Holosun red dot optic. The suppressor used was a YHM R45, which is rated for .45 ACP but demonstrated effectiveness on the 9mm Glock 19.

How does subsonic ammunition affect shooting with a suppressor?

Subsonic ammunition, by staying below the speed of sound, eliminates the sharp 'crack' associated with supersonic bullets. When paired with a suppressor, this results in a much quieter shooting experience, maximizing the effectiveness of the suppressor.

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