HEARING PROTECTION
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
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.
11
NRR
Test Frequencies (Hz)
Mean Attenuation (dB)
Standard Deviation (dB)
125
10.3
4.0
250
11.1
3.9
500
16.5
3.5
1000
20.1
3.5
2000
26.6
4.1
3150
26.1
4.
2
4000
24.9
4.3
8000
36.7
6.0
6300
30.8
4.6
EP3 Sonic Defenders -
FILTER CAPS OUT
NOISE REDUCTION RATING (NRR)
24
NRR
Test Frequencies (Hz)
Mean Attenuation (dB)
Standard Deviation (dB)
125
31.1
3.3
250
29.9
4.3
500
33.9
4.4
1000
31.2
2.9
2000
35.6
3.8
3150
37.5
5.7
4000
33.6
4.5
8000
43.5
6.3
6300
41.8
6.6
EP3 Sonic Defenders -
FILTER CAPS IN
(when used as directed)
(when used as directed)
WITH FILTER CAPS OUT
WITH FILTER CAPS IN
132 dB Overall Average PIL
150 dB Overall Average PIL
168 dB Overall Average PIL
37.5
37.4
41.9
Average Peak Impulse Level
dB Reduction
NOISE REDUC
TION (
dB)
EP3 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
23.2
28.9
29.1
Average Peak Impulse Level
dB Reduction
ANSI S12.42-2010
NOISE REDUC
TION (
dB)
EP3 Impulse Noise Reduction—
Filter Caps In
45
40
35
30
25
20
15
10
5
0
132
150
168
IMPULSE NOISE LEVEL (dB)
