2 to 8000 hertz? Although there are electromagnetic waves of those frequencies, that sounds more like audio.

If your signals are indeed eartones, then it is disingenuous of you to label them electromagnetic.

If they are eartones, call them eartones.

On the other hand, if you really are measuring electromagnetic radiation of those frequencies, I would be VERY interested in learning more about the equipment used to detect and measure them. I have a background in electronics, and have been studying to get an amateur radio license.

Brian