I doubt it will hurt anything but the real issue is that I also doubt you'll get much of an improvement without adding an auxiliary amp.Now in 2018 and I'm still trying to simplify things... I just tried two different speakers on a new store-bought prop. I tried a small and a big one. The big sounds better but not much louder.
Has anyone tried to change the speaker impedance, e.g., replacing the 8 ohm speaker with a 4 or 2 ohm speaker? I know that might tax the on-board amp, but since it's not on for long, it may work.
If you have an opinion, let me know before I buy a 4 ohm speaker to try... Thanks!