If you have a hearing aid, a “hearing loop” can improve its effectiveness.
A hearing loop consists of a thin copper wire installed around the periphery of a room that emits a signal that is then picked up by a tiny receiver inside the hearing aid, called a telecoil, or t-coil. Most hearing aids (and all cochlear implants) now come with t-coils. In some cases they can be retrofitted.
In recent years, hearing loops have been placed in many public spaces such as banks, theaters and lecture halls, but you can install one in your home (such as in a TV room) for about $130 to $200.
Here's one resource for home loop systems and services.