At the low end, there has been some experimentation with using Apple AirPods as hearing aids:
https://gizmodo.com/apple-airpods-hearing-aids-study-1849779841If you're using a custom profile they're probably not much use for you now, but I'd expect extremely rapid improvements (even disruption). You might want to keep an eye on that.
How do a current smartphone and high fidelity earbuds compare to the processing power and audio output of your current equipment?
Regards. Al
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