I wonder why the chart on the site is only for frequencies up to 8kHz. Audible goes up to at least 16kHz for folks over 30 years old. I’ll have to check how high the guitars go on stage. Honestly, I’ll probably order some anyways. Are these the ones with the valve thing that opens at higher pressure (more noise)?
Sometimea you might not realize that you’re actually thirsty. Drink a glass of water and see if that helps. Meds cause dehydration.