"Woody"

Speaker height was always regarded as that necessary to place the speakers
at ear level when in the listening position.

** One notable thing about the human head is that the eyes and
the ears are at the same level.

With most speakers, the tweeters are the predominant source for
sound location - so they set the width and height ( above the floor)
of the sound stage.

Most folk like the sound stage to be right in front of them when
seated in the middle of a stereo pair, as it helps them imagine
the performance. Same goes for TV and cinema screens too.

Eye level is the thing you set tweeters at.



..... Phil