HEARING PROTECTION
EP4 Sonic Defenders
®
Plus
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
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.
EP4 Sonic Defenders Plus - FILTER CAPS OUT
NOISE REDUCTION RATING
(NRR)
EP4 Sonic Defenders Plus - FILTER CAPS IN
(when used as directed)
(when used as directed)
12
NRR
Test Frequencies (Hz)
Mean Attenuation (dB)
Standard Deviation (dB)
125
9.7
3.7
250
10.5
3.4
500
15.6
2.4
1000
20.4
3.0
2000
29.0
3.0
3150
32.0
5.8
4000
28.2
5.6
8000
36.9
5.7
6300
30.2
5.5
24
NRR
Test Frequencies (Hz)
Mean Attenuation (dB)
Standard Deviation (dB)
125
31.7
5.4
250
29.3
4.6
500
32.9
4.3
1000
30.5
3.2
2000
35.6
4.1
3150
37.2
4.2
4000
35.0
3.6
8000
37.7
5.5
6300
34.4
4.1
WITH FILTER CAPS OUT
WITH FILTER CAPS IN
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
23.9
28.8
30.0
Average Peak Impulse Level dB Reduction
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
39.8
40.7
40.5
Average Peak Impulse Level dB Reduction
NOISE REDUCTION (dB)
EP4 Impulse Noise Reduction—Filter Caps Out
ANSI S12.42-2010
45
40
35
30
25
20
15
10
5
0
132 150 168
IMPULSE NOISE LEVEL (dB)
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
23.9
28.8
30.0
Average Peak Impulse Level dB Reduction
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
39.8
40.7
40.5
Average Peak Impulse Level dB Reduction
ANSI S12.42-2010
NOISE REDUCTION (dB)
EP4 Impulse Noise Reduction—Filter Caps In
45
40
35
30
25
20
15
10
5
0
132 150 168
IMPULSE NOISE LEVEL (dB)
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