mc ~ " It is all summed at that frequency anyway. But, whatever. "
Kindly explain HOW, in your opinion, that happens???
What if the HOW is automatic? What if it turns out the HOW cannot be anything BUT?
The wavelength at 80Hz is 4.3m or about 15 feet. At 20Hz it is over 17m or about 55ft. https://www.translatorscafe.com/unit-converter/en-US/calculator/sound-frequency-wavelength/ HOW are you going to ever manage to record that in "stereo" with any sort of ability to localize the sound without using microphones placed at least that far apart?? And in a room many multiples of those dimensions?
HOW are you going to do that?
Even if you do, HOW are you going to manage to play it back in stereo, in a room with dimensions smaller than the wavelengths involved?
HOW?