Substitute speakers for the PFM sound system.
I got some sugar cube speakers (and enclosures are required)
https://tonystrains.com/produc...rsonic-mini-speaker/
The sugar cube speakers worked great for the PFM sound system.
A speaker enclosure is needed for proper sound (not sure why they sell the speaker and enclosure separate as both are required).
They measure about 3/8" X 1/2" and are super thin. The enclosure adds about another 1/2" to the depth.
Compared to the PFM speaker (in photo) is about an inch square and about 1/4" thick.
Each set is 16 bucks.
Sam