I would suggest using a lapel mic, alot simpler to use and manged. this will result in a clearer recording and output to a pa. using a ceiling speaker or choir type of microphone will add alot of back ground noise unless you can change the type of mic (directional or pan) if you use a ceiling speaker i would suggest adding a gate to each microphone, aim to have the center microphones more sensitive and begin to limit the further you pan out.