Surefire EP4 Sonic Defenders Plus Manuale utente
HEARING PROTECTION
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)
CONNECTING/DISCONNECTING LANYARD
CLEANING, STORAGE & PRODUCT LIFE
EP4 Sonic Defenders
Plus
typically last up to 6+months, depending on usage
and care. Clean with mild soap and water or alcohol swabs and allow to air
dry. If exposed to salt water, rinse with fresh water and allow to air dry. Inspect
earplugs regularly and replace when they become stiff and hardened. Store in
a cool, dry place in the included container. Do not leave in direct sunlight. In
extreme storage temperatures, filters may separate from stems. If this occurs,
filters must be reinserted into stems before using.
NOTE: EP4s provide a reduced level of hearing protection with their noise-reducing filters removed.
RADIO COMMUNICATION SYSTEM USE
An EP4 earplug can also serve as an earpiece for compatible radio
communication systems by simply removing its noise-reducing filter (store in a
safe place for future use) and inserting the system’s elbow connector into the
hole previously occupied by the filter until snug.
18300 Mt. Baldy Circle •Fountain Valley, CA 92708, U.S.A •www.surefire.com/hearingprotection •800.828.8809
71-01-907 Rev.A
1. Starting with the EarLock®retention ring oriented slightly backward, rotate
the earplug forward while inserting the stem of the red-filtered EP4 into the
right ear canal deep enough for the uppermost flange to seal. Fit the retention
ring to the natural contour of the concha bowl surrounding the ear canal to
lock the earplug in place.
2. Check the seal by placing your fingertip over the outer hole of filter and then
removing. Detection of a slight suction indicates a proper seal.
3. Repeat process with white-filtered earplug for left ear.
4. Test earplugs by clapping, with filter caps out. If no noticeable decrease in
volume, reinsert and retest.
5. To block lower-level noise* in quiet environments and to maximize protection,
insert attached filter caps into filter holes and push in until snug.
* Inserting filter caps negates noise-reducing filters’ abilities to let ambient sounds and
conversations pass safely through.
FITTING & TESTING
WARNING: If the instructions above are not adhered to, the protection afforded by
EP4 Sonic Defenders
Plus
will be severely impaired.
STEM ADJUSTMENT
EP4 Sonic Defenders®
Plus
feature adjustable stems to maximize fit and
comfort. To adjust stem, with earplug removed from ear, pull out or push in
stem to lengthen or shorten for comfort.
Remove twist tie and uncoil
lanyard. Insert lanyard ends into
small holes on the outside of EP4s,
located beneath the noise-reducing
filters, and push in until lanyard
ends snap in place. To remove, pull
gently on lanyard ends until they
disconnect from earplugs.
SUREFIRE NO-HASSLE PROMISE
We’ll do what it takes to keep your SureFire gear running smoothly.
SureFire warrants that if you—our customer—purchase one of our products, and
we determine that it is defective in material and/or workmanship, we will repair or
replace it for free or refund your money—no hassle! SureFire Hearing Protection
products are warranted for 90 days from the date of purchase. Our warranty does
not cover consumables, or normal wear-and-tear, or damage resulting from abuse,
alterations, unauthorized repairs, or use contrary to SureFire’s user manuals. For
complete warranty information, visit www.surefire.com/warranty.
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