they should block out sufficient noise....80db like our bead-blast booths My brother used to use a sand-blast booth to carve the ivy leaves, grapes, numbers, and letters on grave stones. Yes that was loud considering no one used any protection back in 1956-1962.
I have no idea what my S4 db rating would be, but it's up there LOL. But he is a perfect, almost perfect angel, isn't he????
Oh the joys of happy children, no matter how loud. Well sometimes loud is OK.
