Where the heck did my last response update go?
Well, good news.
I took the advice here about moving the speakers closer together. I moved them about a foot each side towards the centre and about another 6” forward.
Problem solved.
Now there’s no difference standing or sitting. Both have the same excellent bass. Powerful, deep and clear. Wife approves! She’s a long term Hi-Fi buddy.
I have them towed in towards the seating position and it’s a nice clear focus. I’ll bring another eames style chair in this room shortly. Or an exercise bike!
First, thanks to those here who suggested this solution. It worked. I’m grateful.
To Erik and others here who provided detailed analysis and thoughtful suggestions I appreciate your efforts. Maybe these are constructive suggestions for the future.
@danager try closing the gap between your speakers as a starting point as much as you can. Let us know what happens or what obstacles you have.
John