Magnum Ear hearing protection instrument Operation Manual - page 8
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The level of noise entering a person’s ear, when hearing protector is
worn as directed, is closely approximated by the difference between
theA-weightedenvironmentalnoiselevelandtheNRR.
1 . The environmental noise level as measured at the ear 92 dBA .
2.TheNRRis24dB(custom)/26dB(BTE).
3 . The level of noise entering the ear is approximately equal to
[92dB(A)–NRR]dB(A).
Caution: For noise environments dominated by frequencies below
500 Hz the C-weighted environmental noise levels should be used .
Improper fit of this device will reduce its effectiveness in attenuating
noise . Consult the enclosed instructions for proper fit .
Although hearing protectors can be recommended for protection
againsttheharmfuleffectsofimpulsivenoise,theNoiseReduction
Rating(NRR)isbasedontheattenuationofcontinuousnoiseand
may not be an accurate indicator of the protection attainable
against impulsive noise such as gunfire .