140 dB is the loudest recommended exposure with hearing protection. Even short term exposure will cause permanent damage. This is the same level as a fully powered jet engine at 100 feet.
It's important to remember that the decibel system increases exponentially. A 10 dB increase means the sound is twice as loud. A 20 dB increase means the sound is 4 times as loud.
They are dangerous enough in the open air. They were 10 times worse inside a room. Don't do it - you will damage his hearing (and yours if you are in the room).
Extremely bad.
In a closed room that's going to be permanent hearing damage - at least.
Don't be stupid.
I was thinking about buying an airsoft sound grenade to throw into a room that my friend is in, because we mess around with each other like this a lot, but I don't know if it would be safe because they go of at 130 decibels so if anyone knows a lot about the effects of sounds on humans it would be great to know if this is safe.
