I don't quite follow the point about the necessity of summing deep bass to 'fit it on a record'. A full wavelength at 20Hz on a 33 1/3 RPM record traces 10 degrees. Put another way, you can fit 36 wavelengths of a 20Hz signal around a groove. Together with RIAA deemphasis, ~20db at 20Hz, this wouldn't seem to be a problem. What I don't know is what physical groove modulation is needed for a 0db level at 20Hz. Perhaps you're right.
At what frequency do they start summing to mono for LPs?
This of course completely begs the question of the necessity for stereo bass that low, unless of course your listening room is the size of a football stadium.
At what frequency do they start summing to mono for LPs?
This of course completely begs the question of the necessity for stereo bass that low, unless of course your listening room is the size of a football stadium.