Not sure if this is the best place for a discussion about hearing protection, but since it is mostly relevant to acoustic instruments I've dropped it in here.
I recently got a new pair of custom fitted in-ear plugs as PPE for work. As I'm just wearing them in I decided to bring them home over the weekend to continue that process. They were still in when I got home last night and went to play a little piano. That was a very interesting experience.
I have two upright pianos, once of which is a moderately expensive 'dream' piano that has a very rich sound, and the other is a cheaper piano that served as a stopgap during the COVID-related supply chain disruption. My AF sounded good while I was playing, although perhaps lost some of the tonal complexity even though it has a relatively 'pure' sound. I then turned to my budget upright, which generally has a warmer tone but also some less pleasing stuff in the sound. While wearing the plugs it sounded rather nice, albeit still not as rich as my AF. Importantly, the harshness that can occur was completely absent.
My ear plugs are designed for industrial environments, not musical performance environments, so the frequency filter is not necessarily designed to apply the same reduction across all audible sound. Does anybody use the specialist musician ear plugs when playing piano or going to a concert? What is the effect? Are they custom fit or off the shelf?
(As an aside, I will be taking with my tech about whether any rogue frequency damping can be done on my cheap piano.)