Surefire EarPro EP3 Sonic Defenders Quick Start Manual

EP3 Sonic Defenders
Two Levels of Protection Against Two Types of Noise
Filtered EP3 Sonic Defenders provide two levels of protection—with
their attached filter caps in or out—against two types of noise:
continuous noise (example: loud roar of an engine) and impulse noise
(example: gunshot). With the filter caps out of the noise-reducing filters,
loud potentially dangerous sounds (above 85dB) are lowered while
safe-level ambient sounds and conversations are allowed to pass
through and be heard. With the filter caps inserted, additional hearing
protection is afforded and ambient sounds and conversations are blocked.
FOR PROTECTION WITH THE ABILITY TO HEAR AMBIENT SOUNDS, leave filter caps
out, or pry out with your fingernail if already inserted. FOR MAXIMUM PROTECTION OR
SITUATIONS WHERE YOU DON'T WANT TO HEAR AMBIENT SOUNDS, insert filter caps
into filter holes and push in until snug.

NOISE ATTENUATION DATA

NOISE REDUCTION RATING (NRR)
EP3 Sonic Defenders - FILTER CAPS OUT
Test Frequencies (Hz) 125 250 500 1000
10.3 11.1 16.5 20.1
Mean Attenuation (dB)
Standard Deviation (dB) 4.0 3.9 3.5 3.5
EP3 Sonic Defenders - FILTER CAPS IN
125 250 500 1000
Test Frequencies (Hz)
31.1 29.9 33.9 31.2
Mean Attenuation (dB)
Standard Deviation (dB) 3.3 4.3 4.4 2.9
WARNING: Improper fit of this device will reduce its effectiveness in attenuating noise.
Follow instructions for proper fit. Failure to follow instructions could result in hearing loss
and/or injury. EP3 Sonic Defenders fit most people; however, no hearing protection fits
everyone. If proper fit cannot be achieved following instructions, discontinue use. Do not
use in environments with extreme air/water pressure or where abrupt pressure changes
occur. EP3s should not be worn underwater in depths exceeding one meter.
®
2000 3150 4000 6300 8000 NRR
26.6 26.1 24.9 30.8 36.7
11
4.1 4.2 4.3 4.6 6.0
2000 3150 4000 6300 8000
NRR
35.6 37.5 33.6 41.8 43.5
24
3.8 5.7 4.5 6.6 6.3
EP3 Impulse Noise
45
40
35
30
25
20
15
10
5
0
Average Peak Impulse Level
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
EP3 Impulse Noise
45
40
(when used as directed)
35
30
25
WITH FILTER CAPS OUT
20
15
10
(when used as directed)
5
0
WITH FILTER CAPS IN
Average Peak Impulse Level
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
Reduction—Filter Caps Out
132 150
IMPULSE NOISE LEVEL (dB)
dB Reduction
23.2
28.9
29.1
Reduction—Filter Caps In
132 150
IMPULSE NOISE LEVEL (dB)
dB Reduction
37.5
37.4
41.9

HEARING PROTECTION

168
ANSI S12.42-2010
168
ANSI S12.42-2010