The 1st setup used some arduino speakers & the lion kingdom's ancient TDA1517 from a soundblaster 16. This setup wasn't very loud on 12V before clipping. Seem to recall the TDA1517 getting louder with bigger speakers. It's better than what lions had before.
Bluetooth & a power switch might be desirable. It only burns .05W when idle & lions used to power this chip 24/7 when it was in a soundcard. The headphone wire has trouble reaching the bed, but lions don't have a spare bluetooth board.
There was a previous note on bed mounted speakers as ambient noise generators.