SNR is a Single Number Rating system as per the International Organization for Standardization’s ISO 4869 certification.

Independent laboratories test earplugs to determine their SNR value. The SNR value can be used to compare the level of noise attenuation offered by different hearing protectors. To determine acoustic pressure on your ears, you subtract the SNR value from the average noise level measured. For example:

  • The music in a discotheque measures an average of 99 dB.
  • You are wearing the Alpine PartyPlug with an SNR of 19.
  • Thus, the acoustic pressure on your ears is on average 99 – 19 = 80 dB.

The higher the SNR, the higher the level of noise attenuation provided by the earplugs. Bear in mind that the SNR value is a rough average. Earplugs attenuate lower tones differently to higher tones. To understand that, you need to compare earplugs at different frequencies, using H, M and L values.
H: High frequencies between 2000 and 8000 Hz
M: Medium frequencies between 1000 and 2000 Hz
L: Low frequencies between 63 and 1000 Hz

For PartyPlug earplugs, these values are as follows:
H=19
M=17
L=12

If you refer to the table of noise attenuation values for PartyPlug earplugs, it looks as follows. It shows you by exactly how much the earplugs attenuate noise at which frequency.

Hz631252505001000200040008000
dB8,810,313,216,620,625,425,219,2

The SNR value is a European standard. In the United States, measuring is carried out via an NRR (Noise Reduction Rating) determined by American National Standards (ANSI). Many of our products also have an NRR value. For example, the PartyPlug’s value is 16.5-21.5.