Single Number Rating (SNR)
An indicator of how much decibel certain headphones reduce the level of external noise. Acoustic efficiency SNR (Single Number Rating) is the sound absorption characteristics according to the requirements of the European quality standard. A similar standard in the American style is called NRR (about it, see below).
The specified SNR value allows you to determine how much peak noise the headphones absorb. So, if this parameter is 27 dB, then the noise level that enters the user's ear is 27 dB lower than the sound level in the environment. The higher the SNR value, the more effective the hearing protection.
Noise Reduction Ratio (NRR)
An indicator of how much volume in decibels tactical headphones cut during operation. Acoustic efficiency NRR (Noise Reduction Rating) is the sound absorption characteristics according to the requirements of the American quality standard. A similar standard in the European style is called SRR (about it, see above).
NRR is an assessment of how effectively a hearing protection device can reduce ambient noise levels. If headphones are marked with the “NRR 30 dB” mark, then they can reduce the level of external sounds by 30 dB. The higher the NRR value, the more effective the tactical headphones are at protecting the hearing aid.
