@ditusa thanks for these links. I found this especially interesting:
If you hear a system (hopefully not yours) that sounds "fast" or "slow" in the bass, enough that you have noticed anyway, that system has a problem.
Then my KLH setup has a problem because on tracks with complex percussion (Solange Seat at the Table is my favorite test recording for this) the bass behaves with appreciably more tightness and speed compared to my two JBL models. It's then a question of if I subjectively enjoy that presentation of the music better or worse than the JBLs, and for me the answer is that I do, realizing that many would likely prefer the bass presentation of the JBLs.