I can’t help but correct and explain the physics (specifically, psychoacoustics) at work here. The audio engineer side of me won’t let it go.though in recent years, i've been using some of the many pairs of my vic firth SIH1 headphones that broke - i just snip off the cable. gives you a lot more low end
Gun muffs and drummer headphones (like Ultraphones, which are actually gun muffs) block out a great amount of the high frequencies you’d hear without them. What’s perceived as more bass or low end is actually the same amount of low end that was there before putting on the muffs. It’s just that you’re hearing the sound with a large amount of higher frequencies blocked by the muffs. There is no actual increase in the low end.