The SNR value (Single Number Rating) is a European standard that allows you to compare the level of sound attenuation of different hearing protectors. Independent laboratories test earplugs and earmuffs to determine the SNR value of an earplug.
In the United States, instead of an SNR, an NRR (Noise Reduction Rating) is used. This standard is slightly stricter than the European norm. The higher these ratings, the more the hearing protection attenuates sound. Often, both the NRR and SNR ratings are listed on Alpine product packaging.
The PartyPlug Pro earplugs reduce sound by 21 dB (SNR), while the standard PartyPlug provides 19 dB attenuation. To put this into perspective: an average festival produces around 100-110 dB of sound. With PartyPlug Pro earplugs, this is reduced to a safe level of approximately 80-90 dB. This is important because hearing damage can occur with exposure to sound above 80 dB over prolonged periods. At 100 dB, hearing damage can occur within 15 minutes.