Ear Plugs

[Mrcrash3]

I have a question for the members of the forum. I have been officiating volleyball for the past 10 years at a Jr.H.S. level using NFHS rule set.
I basically officiate in two-three diffferent gyms 25-30 matches a season These are very small gyms.
My question is I have been using ear plugs I believe the brand name is "Ear Planes"when I officiate to save my hearing. I figure approx 300 whistles a match is gone to hurt my hearing. I have even gone to a Fox Pearl whistle (lower tone). This plug seems to eliminate the high pitch but I can still hear most conversation without removing them.
How is this veiwed at the next level (HS). Is it a frowned upon for lower level matches? Tourneys ? Would it depend on the individual assignors?
Thank You