At Fuji news in London UK we use a 50AC acoustic coupler which has proved useful for reporters in the field. I would like to get hold of another or similar device, any sources?
We wish we could help. The 50AC was discontinued nearly 10 years ago due to very poor sales. We have been unable to locate any other manufacturer of such a device, probably because of the extremely small potential market.
You might try companies that make acoustic modems as the operational concept is similar.