For what it’s worth, the mics

For what it's worth, the mics are binaural – rather good stereo imaging, but doesn't work on loudspeakers, only headphones – as the idea is based on the model of human heads – we have two omnidirectional ears (pressure operated), that have an obstacle between them (our skull). The Sony has the unit itself as the obstacle, so can record quite realistic stereo, but needs to have the left and right outputs into each ear with no crosstalk to work properly.