Having thought about the state of play at Firebottle Towers it seems there is a bit of a trend here in having speakers high up.
The heights are all measured from floor to the top edge, not including super tweeters.
The music room speakers, the ESL57's are the highest at 2.58 metres, hung from the vaulted ceiling.
The speakers in the kitchen are on top of a tall cabinet at 2.31 metres to top edge.
Next highest are in the garage, on top of a receiver on a shelf, at 2.20 metres to top edge.
The workshop speakers are wall mounted at 1.91 metres to top edge.
The last pair of speakers in use in the lounge must be suffering from acrophobia, but then they are floorstanders at 0.79 metres so maybe can be forgiven.