Because I have several good (but older) sound systems in my apartment I am looking for a way to play audio from an iPhone or computer (anything with a headphone jack) synchronously on all of them. All the receivers are hooked up to Analog Cable Radio (Not over the air antenna). So I thought it might be clever to send the music over the existing wiring on a specific carrier frequency which I would set the receiver to.
Does anybody know how to do this? Is there maybe a little gadget or a not-to-complicated way to build it?
Hope you guys get my point and thanks in advance!