It depends on speakers. Some speakers should be placed with the midrange at the ear level, some should be lower, some should be higher. You need to find out from the speaker manufacturer what the recommended hight is.
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Although tweeter at ear level is the general rule, experimentation can work wonders. I had a pair of Silverline Audio SR-11s sitting on 24 inch stands with tweeters at ear level. The sound was good but if I slouched down the sound was better. I moved them to taller stands which raised the tweeter about six inches. Huge improvement.
More recently I had the opposite experience with PMC DB1+ speakers. They started out with the tweeter at ear level but after some experimentation I found the sound improved with the tweeter about 4-6 inches below ear level.
Experiment to get what suits you best has become my rule.
Timrhu is right, it depends on the speakers.
Generally speaking, I like tweeters to be above my ear level. This usually produces a more spacious sound minus the brightness. Another advantage is higher off the floor and clean up the bass even more.
But there are exceptions. My large speakers sound better with my ears at tweeter level.
There are many full range speakers with tweeters positioned higher than the ears level. Also, in many live performance in small rooms, the singer's voice would come above the ears level when you sit in a chair.
So, I am not sure how accurate the general rule (tweeter height == ears level) is. But, you may not have it so higher or lower than the listening level. ;-)