In article .com,
"Rees" wrote:

My father in law is ready to give up his hearing aids and wear a pair
of headphones connected to an equilizing amplifier, with a microphone
input. It would allow him to hand the microphone to whomever he's
speaking with, filter out any competing noises, and listen through
comfy headphones.

Anybody know of such a thing? Are there variations on the CMoy design
that might work?

Dunno about the CMoy design, but I've seen a device for educational
settings that has a "necklace" with a flashlight-sized unit with a mic
and wireless transmitter for the teacher to wear.

Good luck!

Stephen