On my computer (sound level both 100%) the firework is very loud ... rain and thunderstorm: nearly nothing to hear! You have to listen very carefull and then it sounds like a background noise.
In the default option nothing to hear. Problem with the 100% option: when you start another software with sound or you have enabled the Window system sound your speakers like to jump out of the computer

I'm using external speakers too and in this case you get "a good vibration"

Werner