This isn't exactly theater/stage related, but it is pro-audio related, so I am thinking perhaps the geniuses of this forum might have some suggestions. I am looking for a way to record video with an iPhone, but for the audio, using high-end pro-audio lavalier or headset microphones (Countryman, etc) that use balanced audio / XLR connectors. So I need some way to convert from mono or stereo balanced analog audio to bluetooth, to be paired with the iPhone. , I have been trying to do some research but I must say, Amazon has a most horrendous search system for trying to find something out of the ordinary. I can't find a way to demand a keyword be present or to exclude a keyword in Amazon search. Amazon has large numbers of "bluetooth to balanced/XLR-audio OUTPUT" converters, but I have not been able to find anything on the input side.