and in military aircraft a helmet so the sound to the pilot would be a lot less due to the soundproofing of the headset over the ears than just raw sound.
Just a brief note, if I may: Speaking from experience working on and around military birds, both on the flightline and off, most of the pilots I saw either putting their helmet on as they got ready for flight, or taking it off afterwards, not only had the "soundproofing" from their helmet, but almost invariably wore foamies under it. Some had "custom" plugs they wore under their helmet, but most I saw just used the ubiquitous foamies. They were free, and available in dispenser boxes all over the place. In the ready room, in the flightline shack, in every shop, in several places around the hangars, you name it.
Point being, I'm guessing the helmet's ear pieces weren't all that effective, and many military birds were
noisy with just the engines running. I know that when we took a bird to run-up, whether high-power or not, everyone wore foamies and the Micky-Mouse headsets. Same with the flightdeck of the boats.
Everyone that went out on the flight deck, or the hangar deck, would wear foamies and headsets, whether Micky-Mouse or the integral ones in the cranials. Even during a FOD walk.
Even when I was working the Rifle/ Pistol ranges as a coach. I kind of "absconded" with a Micky-Mouse headset from my avionics shop before I left. Worked great. We used both foamies and headsets running up our radar systems. Noisey buggers...
Sorry, I ramble. In any event, the military is
noisey, so for realism, you need to max out the noise in the cockpit. ALL the noise
Have fun all!
Pat☺