A number of years ago the former MENC (now NAfME) had a publication that was a recommendation of what music ensembles (bands, orchestras & choirs) should have in their program's facilities. Part of their studies included the effects of the typical sounds during rehearsals on the hearing of the teacher/conductor.
A big factor they found that contributed to PERMANENT hearing loss was rehearsing in rooms with low ceilings, particular with bands.
The hearing losses greatly accelerated the loss of the highest frequencies and over time they worked their way down the frequency spectrum. This eventually affects a person's hearing especially in hearing speech since the pronunciation of words critically relies on the hearing of higher frequency consonant sounds to enunciate words.
This contributes to a person's overall hearing loss over time when the ability to hear the higher frequencies causes them to hear a speaker's talking as a jumble of lower frequency vowel sounds.
So I would HIGHLY recommend getting some sort of sound mitigation done to your band room to protect your hearing from permanent irreversible damage.
DesertJazz's recommendation to check out Wenger's services is a great idea. Here is a link to Wenger's publication that sheds light on how to improve your facility:
A NEW CONSTRUCTION AND RENOVATION RESOURCE FOR MUSIC EDUCATORS, FACILI
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