takatsa wrote: Small church - small echo, big church - big echo. And of course there are other factors as well. The vaulted ceiling gives a nice echo, the flat ceiling is dry.
May I respectfully put that into perspective: e.g. the St. Joseph's Church in Groningen, with plenty of space and a high vaulted ceiling has pretty dry acoustics. I was once in a room in the orient with wooden floors, wooden ceiling, basically a squarish "shoebox", not too high, perhaps about 500 - 625sq. meters floorplan, and absolute fantastic acoustics. The church in Leens is not small either but vaulted ceilings are not too high and the reverb is limited.
The sample set of Bergen op Zoom by Sonus Paradisi is an example of troubled acoustics: the nave has a flat ceiling, while the much higher coir has vaulted ceilings; producing two types of acoustics that basically fight each other. It is a problem there.
A lot depends on the materials used, whether stone, or wood, or dry plaster board, etc. And what kind of upholstery, how many objects in the church, pews, chairs, objects hanging on walls, etc., etc.
Also, a lot depends on how high the organ is placed and how much space is there between itself and the ceiling, and how deep the organ case is, etc. The closer to the ceiling, naturally the more direct the reflection.