EN | 14
Fitting
ANSI S3.19-1974 Table (NRR Table)
EN 352-1:2002 Table (SNR Table)
B5: SNR=30dB H=34dB M=27dB L=21dB APVf=MF-SF (dB)
Audio Input (EN 352-6)
Bluetooth (HFP): The maximum SPL is 76.4 dB(A) at -14 dBFS
Entertainment (EN 352-8)
Bluetooth (A2DP): The maximum SPL is 77.1 dB(A) at -10 dBFS
Important
Please read, understand, and follow all safety information.
Fitting
1. Remove the white foam inserts from each earcup
2. Pull the earcups apart
3. Place the product on your head
4. Adjust the earcup position by extending the headband to ensure a good
fit around the ears
Introduction
Thank you for purchasing ISOtunes® LINK Professional Noise Isolating
Earmuffs. These earmuffs have been specifically designed for use in noisy
environments – allowing you to block out much of the surrounding noise so
that you can listen to your music or talk on the phone with less interruption.
This product has been tested and meets the European Safety Standard
EN 352-1:2002, EN 352-6:2002, EN 352-8:2008, RED directive 2014/53/EU,
harmonized standard EN 60065-2014+A11-2017, EN 62479:2020, ETSI EN
300 328 V2.1.1, ETSI EN 301 489-1 V2.1.1,ETSI EN 301 489-17 V3.1.1and the
ANSI standards for a hearing protector, with a Single Number Rating (SNR)
of 30 dB with a Noise Reduction Rating (NRR) of 25 dB. Full testing details
are available in the Noise Attenuation section of this booklet.
Noise Attenuation
APPROVAL: ISOtunes® LINK is tested and approved in accordance with
ANSI S3.19-1974 Specifications and the European Safety Standard EN 352-
1:2002, EN 352-6:2002, and EN 352-8:2008.
ANSI
S3.19-1974
The level of noise entering a person’s ear, when ISOtunes® LINK head-
phones are worn as directed, is closely approximated by the difference
between the A-weighted environmental noise level and the Noise Reduc-
tion Rating (NRR). Improper fit of this device will reduce its effectiveness in
attenuating noise. Consult the enclosed instructions for proper fitting.
A1: Frequency (Hz)
A2: Mean Attenuation (dB)
A3: Standard Deviation (dB)
Example:
1. The surrounding noise level measured at the ear is 100 dB.
2. The NRR of ISOtunes® LINKis 25 dB.
3. The noise level entering the ear is approximately equal to 75dB.
Please note that the NRR is based on the attenuation of continuous noise
and may not be an accurate indicator of the protection attainable against
impulsive noise, such as gunfire.
EN 352
IT-31 ISOtunes LINK EN 352 is certified according to the product standards
EN 352-1:2002, EN 352-6:2002, and EN 352-8:2008.
Frequency (Hz)
125
250
500
1000
2000
4000
8000
Mf (dB)
17.5
21.4
26.6
29.3
37.6
46.4
39.6
sf (dB)
4.5
2.5
2.6
2.3
3.7
4.6
6.8
APVf
13.0
18.9
24.0
27.0
33.9
41.8
32.8
B1:
B2:
B3:
B4:
Frequency,
Hz
125
250
500
1000 2000 3150 4000 6300 8000
NRR
Grand Mean Attenuation, dB
19.9
22.3
27.8
30.8
38.8
44.3
50.0
46.3
42.4
Standard Deviation, dB
3.7
2.9
2.4
2.3
3.8
3.9
3.8
3.1
4.3
25
A1:
A2:
A3:
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