Subsonic vs. Supersonic - back-to-back
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.









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