Probably no sound at all.. that is after the fraction of a second it would take to shatter your ear drums. Up until that point it would probably be quite loud!
I was wondering what the "built for the military" tagline was all about. Maybe for use by PsyOp SF guys?
Having been on live hand grenade ranges, received close air support/arty rounds, and demo ranges, I can assure that hearing damage is easy to get! I've felt the explosion of "mere" 500lb bombs going off during training exercises, I can't even imagine what a 2000lb bomb must feel like (the consussion that is)
