I have just posted about my worries due to a karaoke event and while searching the internet for masking sounds I came over a site with several different frequenzies. I tried the out with good quality headphones on very low volume until i came to one I could not hear. I turned the volume up quite a bit and I heard a loud beep so i quickly turned it off as i realised it was in the same frequenzy as my hearing loss and that was why I couldnt hear it at a low volume. Would a quick burst have damaged my hearing event more? Or would it need more than half a second. I stress out over this and my anxiety are worse tha ever.