Thanks for the input, @cd318 ; I am one that doesn’t want to be limited to a strict sweet spot, but I have always been thinking that if there is one in my "listening room," I’d like to find it.
@erik_squires sorry for the ignorance on this subject, what is meant by mid-axis?
These are the older B&W 805s (not the Diamonds) and the tweeter is sitting about 39" above the floor. I’ve been doing some rearranging in my "listening room," and one of the things I just did was I moved a bulkier computer chair out & temporarily substituted a folding metal chair. Slouched the way I like to, my ears are probably at 44 or 45" high. That is an approximate measurement, because I took it by myself. Getting lower is not going to be hard to do, seeing as how I paid about $10 for the chair, way back when, I wouldn’t have any problem at all with whacking 5 or 6 inches off the legs. Another option is the "pillow chair" from Walmart ($98), and from what I remember of my measurements it would get me down to about 4" lower without having to slouch (the slouch is built in) and it would be a lot more comfortable.