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wrote:
Of course at low frequency xover oints mono is better than trying to
get 'stereo' bass, particularly since there is no stereo at 80 Hz or
lower.

This was very often true in the days when the LP was the primary
music carrier, as the mastering engineer would sum low frequencies
to avoid excessive vertical modulation. But since the introduction
of CD, it is possible to have stereo information recorded at low
frequencies, depending on the original miking. With classical
music, this can add "bloom" and an improved sense of the original
hall acoustic. With rock music, given the ubiquitous placement of
bass guitar and kick drum in the center of the mix, you are
probably correct.

John Atkinson
Editor, Stereophile