What does SNR mean?

Hearing protectors have an SNR value relating to their performance. This information can help with selection by providing a simple way to compare different products.

SNR stands for ‘Single Number Rating’. Hearing protectors are assigned an SNR value based on their attenuation performance, which can be used to select and confirm correct selection of hearing protection products following the appropriate risk assessments.?

SNR information can be used as a general means of comparing the protection level of different products. The SNR value can be subtracted from the overall noise level to estimate the sound pressure at the ear when wearing that particular hearing protector.

A hearing protector’s SNR is displayed on product packaging, detailed in user instructions and available on request from manufacturers.