Great to see that you are responding to the needs of your audiences. You might want to check out Sound Associates Inc (soundassociates.com) - they provide consultation and sales of equipment that includes personal amplification systems. Captioning services should also be available in your area or remotely, via organizations such as https://dhcc.org/interpreting-services/cart/. I suggest you also get in touch with your local Museum Access Consortium and your state department of disability services for recommendations on providers.
Claudia
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Claudia Ocello
President & CEO
Museum Partners Consulting, LLC
Maplewood NJ