Surefire EP4 Sonic Defenders Plus Manual

EP4 Sonic Defenders
Two Levels of Protection Against Two Types of Noise
Filtered EP4 Sonic Defenders Plus 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)
EP4 Sonic Defenders Plus - FILTER CAPS OUT
125 250 500 1000
Test Frequencies (Hz)
Mean Attenuation (dB) 9.7 10.5 15.6 20.4
3.7 3.4 2.4 3.0
Standard Deviation (dB)
EP4 Sonic Defenders Plus - FILTER CAPS IN
125 250 500 1000
Test Frequencies (Hz)
31.7 29.3 32.9 30.5
Mean Attenuation (dB)
5.4 4.6 4.3 3.2
Standard Deviation (dB)
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. EP4 Sonic Defenders Plus 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. EP4s should not be worn underwater in depths exceeding one meter.
Plus
®
2000 3150 4000 6300 8000
NRR
29.0 32.0 28.2 30.2 36.9 12
3.0 5.8 5.6 5.5 5.7
2000 3150 4000 6300 8000
NRR
35.6 37.2 35.0 34.4 37.7 24
4.1 4.2 3.6 4.1 5.5
EP4 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
EP4 Impulse Noise
45
40
(when used as directed)
35
Average Peak Impulse Level
30
Average Peak Impulse Level
25
WITH FILTER CAPS OUT
132 dB Overall Average PIL
132 dB Overall Average PIL
20
150 dB Overall Average PIL
150 dB Overall Average PIL
15
168 dB Overall Average PIL
168 dB Overall Average PIL
(when used as directed)
10
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
23.9
28.8
30.0
Reduction—Filter Caps In
dB Reduction
dB Reduction
39.8
23.9
40.7
28.8
40.5
30.0
132 150
IMPULSE NOISE LEVEL (dB)
dB Reduction
39.8
40.7
40.5
HEARING PROTECTION
HEARING PROTECTION
168
ANSI S12.42-2010
168
ANSI S12.42-2010