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Old 10-26-2009, 02:53 PM
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aom22
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Decibel Readings

DECIBEL READINGS
Air Arms TDR (Take Down Rifle) , .22 Caliber, with factory moderartor - 76.0 db
Source: Air Arms TDR Take Down Rifle Specifications
Subjective Loudness: Air Arms TDR S410
Quote:
Pro 76 silencer does a very efficient job of keeping the muzzle report nice and quiet!
Air Arms TX200, .177 Caliber - 86.0 db
Source: Air Arms TX200 AGR Episode #20
Subjective Loudness: 3-Medium

Air Arms S410, .22 Caliber, Hi-Power Mode - 104.5 db
Source: Air Arms S410 - AGR Episode #15
Subjective Loudness: 2-Low-Medium


BSA GUNS Ultra, Caliber not specified without moderator - 88 db
with factory mini-SAS moderator - 84.0 db
Sound Meter Located:
Quote:
The decibel meter was placed six inches in front of the muzzle and four inches below.
Subjective Loudness: Source: BSA Owners Group ... BSA "SAS" Moderator & BSA ULTRA
Quote:
... the supplied "SAS" still does a resonable job as shooting the Ultra without a moderator
is a pain on the ears (the barrels shortness is obviously to blame) and that four decibel loss is useful....
Subjective Loudness: Source: BSA Air Rifle Pellet Gun Ultra Carbine Review
Quote:
The Ultra Carbine with the factory BSA SAS, full size moderator on it
is a very quiet, suburban neighborhood friendly rifle.

Benjamin Marauder, .22 Caliber - 85.7 db
Source: Benjamin Marauder Part 2 - AGR
Subjective Loudness: 2-Low-Medium

Benjamin Discovery, .22 Caliber - 102.4 db
Source: Benjamin Discovery Part 2 - AGR
Subjective Loudness: 4-Medium-High


Daisy Red Ryder, .177 Caliber - 97.1 dB
Source: Silencer Research Reference Library
Subjective Loudness: 1-Low


Gamo Whisper .177 Caliber - Metal Spring 78.6 db, Air Spring 77.6 db
Source: Gamo Whisper air rifle - AGR Episode #3
Subjective Loudness: 3-Medium ... Metal Spring, 3-Medium ... Gas Spring


FX Cyclone, .22 Caliber - 95.3 db, Sound Meter Located: left of the muzzle and slightly in-front
- 93.1 db, Sound Meter Located: at shooters ear.
Source: Episode #4 FX Cyclone .22

FX Cyclone, .22 Caliber - Low 73.5 db, Medium 84.8 db, High 88.3 db
Source: Airgun sound level measurement
Sound Meter Located:
Quote:
The other biggie is the distance from rifle to meter.
I went with 3 feet to the right side.
Needless to say shooting closer means a higher reading.
Subjective Loudness: Source: Plinker Dot Org ... FX Cyclone
Quote:
It has gone to a new home - great rifle, just too loud for the backyard.


Decibel Ranking of Airguns
Quote:
We took decibel readings of a number of common events to provide a basis of comparison.
The following can easily be duplicated at home.

All comparison tests were done at a distance of 6 ft.
An Arrow T50 heavy duty stapler into a piece of wood ... 97 decibels
A Swingline light duty stapler into a piece of wood ... 93 decibels
A battery powered 1/2" drill 71 decibels
Closing the door on my Ford Explorer (not slammed) ... 85 decibels
Empty soda can hitting a cement floor from shoulder height ... 86 decibels
Opening a full soda can ... 85 decibels
The sound of a doorbell ... 71 decibels

Beeman R7 (.177) ... 88 Decibels
References:

Airgun sound level measurement - by B.B. Pelletier

What is a decibel, and how is it measured?
Quote:
On the decibel scale, the smallest audible sound (near total silence) is 0 dB.
A sound 10 times more powerful is 10 dB.
A sound 100 times more powerful than near total silence is 20 dB.
A sound 1,000 times more powerful than near total silence is 30 dB.

Here are some common sounds and their decibel ratings:
Near total silence - 0 dB
A whisper - 15 dB
Normal conversation - 60 dB
A lawnmower - 90 dB
A car horn - 110 dB
A rock concert or a jet engine - 120 dB
A gunshot or firecracker - 140 dB
Measuring the Intensity of Sound Decibels Explained
Quote:
Rather, in a perfect world, each three decibel increment
affects a 50% change in sound pressure levels.

Thus, a 3 dB drop reduces sound exposure by 50%,
while a 6 dB drop reduces exposure by 75%.
Table B.1 Sound levels (dB) and relative loudness of typical noise sources in indoor and outdoor environments
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