Here's a crappy video of my Williams E7 with the Bluerail board and a 2" bluetooth speaker installed
https://www.youtube.com/watch?v=PEd2Y09RAWI
Maybe it'll give you some idea of the sounds, not sure what the new Bluerail board will do.
The 2" speaker was p/o a bluetooth Gems (company name) speaker I bought at Target for $5. I gutted it and used the speaker, the circuit board and a 5v regulator connected to the Bluerail circuitry.