Future Soundscapes: stethoscope in stereo

Recently I've been working on building a stereo stethoscope for my project. I managed to connect two microphones to line via a separate set of amps and transistors, so they work independently. Somehow the lines are not fully separated, but just pick one of the signals stronger... This remains to be solved—probably the solution is closer than I could ever imagine. Yet, one never sees one's nose, although it is always the closest object to one's eyes...



Imagine what would happen, it the microphones were connected with e.g. 50m long wires and you could listen really close and simultaneously to things that happen in 100m distance from each other, to those tiny sounds audible only to someone being in a very certain spot... What would this mean and what kind of detached experience would a listener have? And what about wires 500m long? You'd be able to eavesdrop on things taking place 1km apart, but you'd probably not see it.