Hi again:
An update on my audio journey: I purchased a set of Cardas Golden Reference XLR interconnects, and after a week of running them in my system, I'm sad to report that these cables were not a good fit. While they brightened the top end, and seemed to punctuate the mids to create a bigger soundstage, the mid/lower bass frequencies were hampered. I kept hoping the cables would settle in, and the low end slam would return, or that my ears would adjust, but...
I ended up putting the AS Testament SEs back in the system, and the frequency balance that I enjoy returned immediately. The process did help me realize that I like the way the AS cables sound -- and this was a huge benefit. If I can find a local dealer who will let me demo some higher end cables before purchase, I'd be open to trying again. But making a blind purchase and hoping it will be a good fit in my system -- especially as one goes higher up the price spectrum -- seems unwise.
So, lots to learn in the upgrade journey. Perhaps my number one lesson, is to make sure one enjoys the system they already have.
Best, JAMES