Wow!!!!! Apparently, mods.dk has a MOD submitted on taking the 30kHz RX limit of the TS-2000 (Which is still pretty good to go down there.), down to 10kHz!
https://www.mods.dk/view.php?ArticleKey=f20d2674cdaf084aaa46808367fcc2f8 I haven't tried this, yet, but it's perked my interest. UPDATE 11/18/2018: Wow!!! That does work! So, what do I hear down in 10kHz? Treble highs from audio. It sounds like high FREQ AM splatter to me here. So, I can now listen to the limits of stereos, but BFD, stereos don't QSL.