Listening chair height?

@erik_squires  , thanks for the suggestions.  The speakers are currently on 24" Target stands (now wishing that many years ago I would have bought higher stands), and I'd rather not shim the stads themselves, but I could easily shim between the front of the speaker & the top of the stand.  I believe that my experimentation is going to be with shortening the legs of the inexpensive listening chair I am currently using.

@onhwy61  (that used to be one of my favorite 8-Track tape), yes, Stereophile did once review the B&W 805 Matrix model, and once upon a time I owned that copy; however, finding it would now be difficult.  I imagine that the review might be available on line, and I still have the manual that came with them and I would think that it would have all the measurements--which should I be most concerned with?

@elliottbnewcombjr  , thank you for the input.

805 Matrix measurements

@onhwy61  , thank you!!

"Vertically, there is very little change in the speaker's sound as long as the listener is on or below the tweeter axis. Move above the tweeter axis, however, and a deep suckout appears at the crossover frequency (fig.6). As is so often the case, this is a speaker that should never be judged by a standing listener."

With a tall speaker your seat would have to be on a ladder!

I use quite tall Wilsons  - they solve this by having vernier adjustment of the forward rake angle of the module carrying the tweeter - you choose your listening chair and then use a laser pointer to align the top module at your head.  Solves that question, but not many speakers are that adjustable