What about these?

https://www.thisoldhouse.com/seaside-victorian-cottage/22229639/s42-e11-design-elements

- about 2 minutes in. (Speakers that go fully inside the ceiling space
and are then plastered over).

No idea what the fire risk is in a fully timber-framed structure, or
what they would sound like. They don't mention the wattage, or the sound
quality.

--
Reentrant