Originally Posted by
LTN Phobia
What I have is an active noise cancelling earphones with custom-fitted noise-isolating earbuds.
Have you also looked at ear protection for markets like target shooting? It's designed to protect against short, high intensity noise, as for example a 45 caliber handgun is about 160 dB when it fires. I know some shooters who have custom mounded earplugs designed to fit their ears that apparently work well. I use the foam earplugs and 3M Peltor muffs over top of that and it works well.