We are a small church and have no real sound knowledgeable people. Frustrated.
Somebody is going to learn a lot!<g>
If I wanted to hear my own playing, over the congregation's singing, I'd wear a set of _open-back_ headphones with just the piano running through them. Or use a small monitor loudspeaker, close to my head.
It's difficult for a musician to hear his instrument, if the loudspeakers are between him and the congregation. A better arrangement is to put the loudspeakers behind the musicians, or to put the musicians in front of the loudspeakers.
Otherwise, you'll be needing monitor loudspeakers for the musicians. It's an extra complication you don't want.
The piano player cannot always hear the clavinova and the clavinova has the sound coming right at them with the 2 speakers that are on the display board. Is there a way to turn this 2 speakers down or almost off?
For most electronic pianos, the loudspeakers turn off when you plug in a headphone. But most don't have a volume control for the loudspeakers, that's separate from the volume control for the "Line Out" jack that feeds the main sound system.
If you're using a proper mixing board for the church PA, try this:
First, set the Clavinova's "own loudspeaker" volume where you want it.
Next, adjust the Clavinova's level at the mixing board to get the proper level into the church PA system.
If the loudspeaker is 20' from the Clavinova, that's a 40' round-trip. Sound travels about 1000 ft/ second, and a 40-millisecond delay (1/25 second) is noticeable to a player. It's just enough to drive you crazy, I think.
It would be useful to have a drawing of the church and sound system.
There is a large archive on the Shure website, about all aspects of designing sound systems for churches. Start here, with the "Houses of Worship" guide:http://www.shure.com/americas/support/downloads/publications