Gun Science: How quiet is subsonic ammunition?

Published on January 21, 2023
Duration: 0:23

This guide details how to objectively measure the sound output of suppressed vs. unsuppressed .22 LR firearms using subsonic ammunition. Bobby Blaze from Guns Blazing Ranch demonstrates the use of a Protmex HT602A decibel meter to record noise levels, showing a significant reduction when a suppressor is used. The data-driven approach provides clear insights into firearm acoustics.

Quick Summary

Testing a suppressed .22 LR rifle with subsonic ammunition reveals significantly reduced noise levels, ranging from 68.1 to 73.6 decibels, comparable to TV audio. Unsuppressed fire with the same ammunition registered much higher, between 94.5 and 95.1 decibels, similar to a jackhammer.

Chapters

  1. 00:00Introduction & Setup
  2. 00:07Unsuppressed .22 LR Noise Test
  3. 00:15Suppressed .22 LR Noise Test

Frequently Asked Questions

How loud is unsuppressed .22 LR subsonic ammunition?

Unsuppressed .22 LR fire using subsonic ammunition typically registers between 94.5 and 95.1 decibels. This level of noise is comparable to loud industrial sounds, such as a jackhammer, making hearing protection essential.

What is the noise level of a suppressed .22 LR rifle with subsonic ammo?

When a .22 LR rifle is suppressed and firing subsonic ammunition, the noise level drops significantly, typically ranging from 68.1 to 73.6 decibels. This is comparable to everyday sounds like television audio.

What equipment is needed to measure firearm noise levels accurately?

To accurately measure firearm noise levels, you need a reliable sound level meter, such as the Protmex HT602A used in this demonstration. It should be capable of capturing peak decibel readings and ideally have features like Max/Min hold for data analysis.

Why is subsonic ammunition quieter than supersonic ammunition?

Subsonic ammunition travels below the speed of sound (approximately 1125 feet per second). This prevents the "sonic boom" or "crack" that supersonic rounds produce, contributing to a quieter overall sound signature, especially when combined with a suppressor.

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