@emergingsoul thanks for your response. I get very good transient response through a Cambridge CXA61 integrated which is definitely not a high price point amp and maybe I just got lucky that it's a great match with my KLH Model 3s.
I did a lot of research and there seemed to be a prevailing, although not backed up by data, belief that a sealed design will deliver better transients on average because of the absence of a port. But certainly ported designs, especially at higher price points, can deliver superior transients as well. That was the primary reason for my posting the question, I wanted to get an idea of higher priced speakers that are found to be very good in this area of performance.