Speaker height...should known better

Experimenting with speaker position is the single most overlooked issue in system set up- in consumer and pro.  For those with excellent hearing, even a few degrees off axis (off angle to the spot the speakers sound best) is audible.  For example, setting speakers sideways is an awful idea as the frequency area where the tweeter and woofer combine ALWAYS narrows vertical dispersion when the tweeter is above the woofer.  Ths works out okay when the speaker is set vertically.  Set horizontally, you narrow the dispersion dramatically in the horizontal plane, making the the sweet spot much smaller and increasing the energy going above and below the horizontal speaker.  If you could see the dispersion, the area where you can hear the speaker correctly in a vertical speaker now set up to be a horizontal speaker increases unwanted reflections. 

A good rule in proper speaker design is the tweeter above the midrange, midrange above the bass driver.  Its where the drivers combine (at crossover points) that the dispersion of the speaker is determined. 

brad   

Shorter chair.

+1 @lonemountain I agree. It can be simply overlooked knowing it is simplest of tweaking. 

Anyone over 185 cm tall has this problem. Speakers do have a recommended listening height and it’s always designed for a very low chair and the average height of a 19th century person. 
Tilting the speakers becomes impossible if you have special footers. 

A good rule in proper speaker design is the tweeter above the midrange, midrange above the bass driver.  Its where the drivers combine (at crossover points) that the dispersion of the speaker is determined.

Some designers routinely mount the tweeter below the woofer to better time align the drivers which also results in a simpler crossover network. I think its a much more novel and effective way of doing so sonically, eliminating extra crossover components and the only real consideration is proper placement. There is also consideration given the subject of lobing that is rarely brought up in these posts involves the relationships between the upper and lower frequency drivers on the front baffle, the cross over network along with the listener’s listening position relative to the speaker system as a whole. The designer has taken that into consideration throughout the design process.

Oh, and always having your tweeter at ear level is not always the best thing unless the designers actually intended it to be that way which most of the time they don’t.