Posted by Not really on 2/11/2021, 8:25 am, in reply to "Re: set up"
The sound does not only come off of the lip plate. The air column in the flute vibrates, producing sound. The path of least resistance is the foot joint (all keys closed), after that the path is which ever tone hole(s) is/are open toward the foot joint.
One can easily measure the volume with a decibel reader at different locations around the player. Different notes will change the volume reading. Perform a test and report back