Anonymous ID: 5d7ed6 Sept. 25, 2018, 6:20 a.m. No.3177625   🗄️.is 🔗kun   >>7679

>>3177593

It's all about frequency as well as attenuation. If you are given the wrong mufflers for the peak noise frequency range you are working in, you may as well not wear them.

 

Marine engine room mufflers also tend to have the largest attenuation value - 37dB(A).