I often have to go into my factory where noise levels are fairly high. (Worst case is 110 dB).
What I have been doing is switching my hearing aids to “Noise Mode”, reducing the volume slightly, (just enough to prevent feedback), and putting on Ear Muff protectors (NRR 25) over my Destiny 1200s.
When I put them on the noise in the shop actually gets a little louder, and I can hear conversation extremely well. I can hear people talking even better than my colleagues with supposedly normal hearing.
Am I being protected, or are my hearing aids defeating the purpose of the muffs ?