Pocket wiz and D800
the priest who was celebrating the wedding was talking into a mic right under the flashes.
I have no idea how close or far the speakers were...I know I put all new batteries in the flashes but did not changed the batteries in the wizards since the utilities showed there were half full. maybe that s why.
the flashes were securely latched at the flexes.
you are right too many factors in one equation.....