Out of interest, why go so far as to use Bluetooth? Why not just put in a CD Player or similar, attached to the Audio Panel and an add to output to all the headsets? Plenty of great systems out there that already handle this sort of thing without the hassle of wireless, batteries etc...etc... in wide spread use with companies that do Scenic Flights for a number of years using Garmin Audio Panels, allows you to isolate so they can listen to the Music/Commentary, You, Radios or a combo.