To ask the Secretary of State for Defence, pursuant to the Answer of 11 March 2025 to Question 36209, what the difference in attenuation across the frequency bands is between the (a) Peltor ComTac XP/XPI and (b) General Service Peltor Ear Muff.
Answered on
20 March 2025
The performance of the ComTac XP/XPI and the General Service Peltor Ear Muff is as follows:
ComTac XP/XPI
Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
Mean attenuation (dB) | 11.5 | 17.9 | 27.8 | 30.0 | 32.1 | 36.2 | 40.3 |
Std deviation (dB) | 2.5 | 2.7 | 1.8 | 2.3 | 3.0 | 2.0 | 3.1 |
Assumed Protection Value (dB) | 9.0 | 15.3 | 25.9 | 27.7 | 29.1 | 34.2 | 37.2 |
SNR=28 db H=31 db M=25 db L=16 db | |||||||
General Service Peltor Ear Muff
Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
Mean attenuation (dB) | 16.2 | 17.0 | 26.4 | 33.5 | 37.1 | 39.1 | 34.3 |
Std deviation (dB) | 4.1 | 2.7 | 2.9 | 4.6 | 2.8 | 3.6 | 4.7 |
Assumed Protection Value (dB) | 12.1 | 14.3 | 23.5 | 28.9 | 34.3 | 35.5 | 29.6 |
SNR=28 db H=33 db M=25 db L=18 db | |||||||
SNR=Single Number Rating, H=High Frequency Attenuation Value, M=Medium Frequency Attenuation Value and L=Low Frequency Attenuation Value.